2017年第2期共收錄55篇
1. Design and Experiment on Seed Corn Whole Stalk Cutting-Placementing Machine of Staminate Plant
Accession number: 20172103687846
Authors: Wang, Jinjiang (1); Chen, Zhi (2); Yang, Xuejun (1); Liu, Yundong (1); Zhang, Tie (1); Dong, Xiang (1)
Author affiliation: (1) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China; (2) China Association of Agricultural Machinery Manufacturers, Beijing; 100083, China
Corresponding author: Chen, Zhi(chenzhi@sinomach.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 104-109
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The whole stalk cutting-placementing machine of staminate plant was designed to improve the mechanical level during the seed corn cultivation. The machine consisted of cutting mechanism, stalk conveying mechanism and hydraulic driving system. The cutting mechanism was featured with a supportless revolving cutting design with an inclination cutting angle. To fully cut the plant, the revolving angel velocity of blade was figured out by considering the parameter of flat blade. A blade kinematic study was conducted to work out the conditions that preventing omitting, and the reasonability of blade structure was proved. Stalk conveying mechanism was constituted of round conveying chain with long and short clamping device installed and compression bar. The test on stalk forcing and conveying kinematic analysis showed that the technical parameters were obtained while stalk could be steadily held and conveyed effectively. Stubble height can be adjusted by a parallelogram design drived by hydraulic cylinder. Blade and conveying chain were motivated by the load-sensing hydraulic system. Field experiment proved that the whole stalk cutting-placementing machine of staminate plant was reliable and highly efficient with a 100% cutting ratio and the orderliness ratio was higher than 95%, which sufficiently met the staminate plant cutting requirement. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 13
Main heading: Seed
Controlled terms: Chain conveyors - Chains - Hydraulic equipment - Hydraulic machinery - Kinematics - Machinery
Uncontrolled terms: Conveying mechanisms - Cutting mechanisms - Field experiment - Hydraulic cylinders - Hydraulic driving system - Kinematic Analysis - Seed corns - Staminate plant
Classification code: 602.1 Mechanical Drives
Mechanical Drives
- 632.2 Hydraulic Equipment and Machinery
Hydraulic Equipment and Machinery
- 692.1 Conveyors
Conveyors
- 821.4 Agricultural Products
Agricultural Products
- 931.1 Mechanics
Mechanics
Numerical data indexing: Percentage 1.00e+02%, Percentage 9.50e+01%
DOI: 10.6041/j.issn.1000-1298.2017.02.014
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
2. Navigation Control System for Orchard Spraying Machine Based on Beidou Navigation Satellite System
Accession number: 20172103687838
Authors: Xiong, Bin (1); Zhang, Junxiong (1); Qu, Feng (1); Fan, Zhiqi (1); Wang, Dashuai (1); Li, Wei (1)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China
Corresponding author: Zhang, Junxiong(cau2007@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 45-50
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: According to the demand of automatic navigation of orchard spraying machine, a navigation control system for spraying robot based on Beidou navigation satellite system(BDS)was designed. The system included RTK-BDS receiver, navigation controller, steering controller, electro pneumatic steering system, three dimensional electronic compass. The closed control loop of steering angle was composed of steering controller, electro pneumatic steering system, three dimensional electronic compass. The closed loop could realize the servo control of steering angle according to control command from navigation controller. The kinematics and dynamics models of spraying machine were analyzed and a look-ahead dynamic path search model was established. The input of the look-ahead dynamic path search model was lateral tracking error and the output was steering angle from navigation controller. Navigation path planning on the spraying machine was designed according to the characteristics of the orchard, and field tests were carried out in the orchard. The tests were done at different traveling speeds, which showed the offset error became bigger with the increase of traveling speed and the traveling speed of 2 km/h was the optimal speed for quick steering speed and small offset error. The field tests showed that the maximum offset error was no more than 0.13 m and the average offset error was no more than 0.03 m for straight tracking at the traveling speed of 2 km/h. The field tests indicated that the navigation control method was appropriated to orchard spraying machine. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Controllers
Controlled terms: Automatic guidance (agricultural machinery) - Communication satellites - Control systems - Errors - Farms - Motion planning - Navigation - Orchards - Pneumatics - Radio navigation - Robot programming - Robots - Satellites - Speed
Uncontrolled terms: Automatic navigation - Beidou navigation satellite systems - Kinematics and dynamics - Navigation control systems - Navigation controllers - Navigation path planning - Spraying machine - Steering controllers
Classification code: 632.3 Pneumatics
Pneumatics
- 655.2 Satellites
Satellites
- 655.2.1 Communication Satellites
Communication Satellites
- 716.3 Radio Systems and Equipment
Radio Systems and Equipment
- 731 Automatic Control Principles and Applications
Automatic Control Principles and Applications
- 732.1 Control Equipment
Control Equipment
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
Numerical data indexing: Size 1.30e-01m, Size 3.00e-02m, Velocity 5.56e-01m/s
DOI: 10.6041/j.issn.1000-1298.2017.02.006
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
3. Effects of Irrigation and Nitrogen Regimes on Seed Yield and Nitrogen Accumulation of Winter Oilseed Rape (Brassica napus L.)
Accession number: 20172103687868
Authors: Gu, Xiaobo (1); Li, Yuannong (1); Du, Yadan (1)
Author affiliation: (1) Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Li, Yuannong(liyuannong@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 271-278
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to investigate the optimal scheme of irrigation and nitrogen application for winter oilseed rape (Brassica napus L.), two-year (2013-2014 and 2014-2015) barrel experiments were conducted to evaluate the effects of different irrigation and nitrogen applications on aboveground dry matter and nitrogen accumulation during reproductive growth stage, seed yield, evapotranspiration (ET) and water use efficiency (WUE), and then determine the yield response factor (Ky) of winter oilseed rape. The experiments included three irrigation levels (W0: (50%~60%)FC, FC denoted field capacity; W1: (60%~70%)FC; W2: (70%~80%)FC) and three nitrogen levels (N0: 0 g; N1: 1.2 g; N2: 2.4 g). The results showed that W1N1 could obviously improve aboveground dry matter and nitrogen accumulation during reproductive growth phase, seed yield, and WUE of winter oilseed rape. However, excessive irrigation or nitrogen (W1N2, W2N1 and W2N2) would not significant increase the aboveground dry matter and nitrogen accumulation, seed yield, and WUE in comparison with W1N1. W2N1 achieved the highest seed yield across the two years, while W1N1 obtained the highest WUE. Though no significant differences of seed yield and WUE were found between W1N1 and W2N1, the ET in W1N1 was significantly lower than that in W2N1. In addition, seed yield and WUE were all showed a significant quadratic parabola relationship with ET, and the Kyof winter oilseed rape was 1.36. In comprehensive consideration of seed yield, water and fertilizer conservation, W1N1 treatment was recommended as an appropriate irrigation and nitrogen application schedule for winter oilseed rape in the study area. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Nitrogen fertilizers
Controlled terms: Efficiency - Irrigation - Nitrogen - Oilseeds - Water supply
Uncontrolled terms: Irrigation level - Nitrogen accumulation - Nitrogen regime - Oil seed rape - Reproductive growth - Seed yield - Water use efficiency - Yield response
Classification code: 446.1 Water Supply Systems
Water Supply Systems
- 804 Chemical Products Generally
Chemical Products Generally
- 821.3 Agricultural Methods
Agricultural Methods
- 821.4 Agricultural Products
Agricultural Products
- 913.1 Production Engineering
Production Engineering
Numerical data indexing: Mass 2.40e-03kg
DOI: 10.6041/j.issn.1000-1298.2017.02.036
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
4. Producing Epoxyethane as Food Fumigant Based on Biocatalysis
Accession number: 20172103687875
Authors: Xu, Ning (1, 2); Xin, Jiaying (1); Wang, Yan (1); Dou, Boxin (1); Xia, Chungu (3)
Author affiliation: (1) Key Laboratory for Food Science and Engineering, Harbin University of Commerce, Harbin; 150076, China; (2) College of Food Science, Northeast Agricultural University, Harbin; 150030, China; (3) State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou; 730030, China
Corresponding author: Xin, Jiaying(xinjiayingvip@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 322-326 and 321
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In addition to application in chemical manufacturing processes, epoxyethane is widely used in processes of food fumigating sterilization, particularly of grains and dried fruits. During the last decades, many research works have been focused on epoxidation reactions of ethylene by supported catalysts such as transition metal complexes and metal nanoparticles. In contrast with chemical synthetic methods, the biocatalytic reaction appears to be a mild and simple method. One biocatalytic method for producing epoxyethane is using methane monooxygenase (MMO) to insert oxygen across the carbon double bonds of ethylene. Epoxyethane synthesis by Methylosinus trichosporium IMV 3011 whole cells which contains the MMO has significant application potential as it is performed at normal temperature and pressure and causes no pollution. The process for producing epoxyethane was described. The effect of initial ethylene concentration on production of epoxyethane was studied. Initial concentrations of oxygen, ethylene and nitrogen were 50%, 20% and 30%, respectively. The amount of epoxyethane formed by free biocatalyst was 29 μmol/mg in approximately 6 h. Moreover, the amount of epoxyethane formed by immobilized biocatalyst was 34 μmol/mg in approximately 8 h. In a batch reaction system, the regenerated immobilized biocatalyst can be repeatedly used for 8 times and 89% of initial MMO activity was retained, and the amount of epoxyethane formed was 3.4 nmol. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Biocatalysts
Controlled terms: Carbon - Chemical bonds - Epoxidation - Ethylene - Metal complexes - Metal nanoparticles - Transition metal compounds - Transition metals
Uncontrolled terms: Biocatalytic reaction - Chemical manufacturing process - Epoxyethane - Ethylene concentration - Immobilized biocatalysts - Methanotrophic bacteria - Methylosinus trichosporium - Normal temperature and pressures
Classification code: 531 Metallurgy and Metallography
Metallurgy and Metallography
- 761 Nanotechnology
Nanotechnology
- 801.4 Physical Chemistry
Physical Chemistry
- 802.2 Chemical Reactions
Chemical Reactions
- 803 Chemical Agents and Basic Industrial Chemicals
Chemical Agents and Basic Industrial Chemicals
- 804 Chemical Products Generally
Chemical Products Generally
Numerical data indexing: Amount_Of_Substance 3.40e-09mol, Molality 2.90e+01mol/kg, Molality 3.40e+01mol/kg, Percentage 2.00e+01%, Percentage 3.00e+01%, Percentage 5.00e+01%, Percentage 8.90e+01%, Time 2.16e+04s, Time 2.88e+04s
DOI: 10.6041/j.issn.1000-1298.2017.02.043
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
5. Effect of Guide Vane Position on Hydraulic Performance of Two-direction Tubular Pump Device
Accession number: 20172103687850
Authors: Meng, Fan (1); Pei, Ji (1); Li, Yanjun (1); Yuan, Shouqi (1); Chen, Jia (1)
Author affiliation: (1) National Research Center of Pumps, Jiangsu University, Zhenjiang; 212013, China
Corresponding author: Pei, Ji(jpei@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 135-140
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Two-direction tubular pump device can be adopted to meet the drainage and water transfer, so it was often used along Yangtze River and sea area. The analysis of hydraulic performance and internal flow becomes research hotspot. The two-direction tubular pump device consists of inlet flow passage, two-direction impeller, straight blade guide vane and outlet flow passage. In order to analyze the effect of guide vane position on hydraulic performance and flow pattern, the CFX14.5 was used to obtain the steady flow field in pump device of six different guide vane positions under positive and reverse conditions. The SST model was chosen, and mass flow rate and total pressure were set at inlet and outlet, respectively. The interfaces between inlet flow passage and impeller, and between impeller and guide vane were set as “Frozen Rotor”. The interface between guide vane and outlet flow passage was set as “None”. In addition, a smooth wall condition was used for the wall function. The results showed that good agreements between simulated and experimental results can be obtained, and the maximum relative error was less than 5%. Under positive rotation, for part-load condition, the efficiency was declined with the increase of guide vane position S and the maximum loss value in diffuser passage can be observed when S was 40 mm. However, for over-load condition and design condition, the efficiency was increased with the increase of S and the minimum loss value in diffuser passage can be obtained when S was 100 mm. Under negative rotation, the effect of guide vane position on hydraulic performance was not obvious. In summary, the guide vane position S with value of 100 mm was optimal. The results can provide reference opinion for two-direction tubular pump device. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 21
Main heading: Pumps
Controlled terms: Efficiency - Flow patterns - Impellers - Inlet flow - Oceanography - Steady flow - Wall function
Uncontrolled terms: Design condition - Flow pattern analysis - Guide vane - Hydraulic performance - Maximum relative errors - Part load conditions - Positive rotations - Tubular pumps
Classification code: 471.1 Oceanography, General
Oceanography, General
- 601.2 Machine Components
Machine Components
- 618.2 Pumps
Pumps
- 631.1 Fluid Flow, General
Fluid Flow, General
- 913.1 Production Engineering
Production Engineering
Numerical data indexing: Percentage 5.00e+00%, Size 1.00e-01m, Size 4.00e-02m
DOI: 10.6041/j.issn.1000-1298.2017.02.018
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
6. Fractal Mechanism of Spatial Distribution of Arable Land Quality in Beijing-Tianjin-Hebei Region
Accession number: 20172103687854
Authors: Yang, Yongxia (1, 2); Sun, Ting (1); Zhang, Lihong (1); Li, Yue (1); Meng, Dan (1)
Author affiliation: (1) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory for Agricultural Land Quality, Monitoring and Control, Ministry of Land and Resources, Beijing; 100035, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 165-171
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to further promote the overall planning and coordination configuration of arable land in Beijing-Tianjin-Hebei region, the space control and comprehensive upgrading mechanism is implemented about arable land quality, and the demand of coordinated development of arable land resource needs to be ensured. Fractal characteristics of spatial distribution of arable land quality in Beijing-Tianjin-Hebei region and its mechanism were studied by the combining means of GIS, fractal theory and grey relational grade analysis. Main conclusions can be drawn as: in Beijing-Tianjin-Hebei region, the quality of arable land showed a trend with certain regularity in space with the characteristics of obvious differences between the north and the south, which was high in south and low in north, low in regional edge, and high in middle region. There was less arable land but good quality in Beijing and Tianjin and a large number of arable land in Hebei; but the quality was generally not high. The fractal theory can be used to study the structural characteristics of the spatial distribution of arable land quality, fractal features represented the spatial form complexity and spatial occupation of arable land quality in Beijing-Tianjin-Hebei region. The spatial structure of Beijing-Tianjin-Hebei region was the simplest with the most stable form and the highest quality, and its space occupying was the highest at the natural quality level. While at the economic quality level it was remained the lowest; the spatial structure and stability of medium land were in the middle, but the space occupying was the largest; spatial structure complexity, the stability of space form and the space occupying of low quality arable land were opposite to the higher quality arable land. The main factors that affected the fractal characteristics of arable land quality were the natural conditions, such as light, temperature and climate, based on this, agricultural production conditions and socio-economic conditions disturbed its fractal characteristics further. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Spatial distribution
Controlled terms: Agriculture - Fractals - Land use - Quality control
Uncontrolled terms: Agricultural productions - Arable land - Beijing-tianjin-hebei regions - Fractal characteristics - Grey relational grade - Socio-economic conditions - Structural characteristics - Tianjin
Classification code: 403 Urban and Regional Planning and Development
Urban and Regional Planning and Development
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 913.3 Quality Assurance and Control
Quality Assurance and Control
- 921 Mathematics
Mathematics
DOI: 10.6041/j.issn.1000-1298.2017.02.022
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
7. Smith Predictive Quantitative Feedback Engine Speed Control
Accession number: 20172103687879
Authors: Lü, Liang (1, 2); Hu, Yunfeng (1, 2); Gong, Xun (1, 3); Hong, Jinlong (1); Chen, Hong (1, 2)
Author affiliation: (1) State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun; 130022, China; (2) College of Communication Engineering, Jilin University, Changchun; 130022, China; (3) College of Engineering, University of Michigan, Ann Arbor; 48109, United States
Corresponding author: Hu, Yunfeng(huyunfeng83125@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 348-353 and 377
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: For hybrid electric vehicles with traction motors installed behind transmission, traction motors can compensate the torque interrupt during gear shifting. Thus engine speed is adjusted to achieve the speed synchronization with AMT so that shifting smoothness is guaranteed without disengaging clutch. Quantitative feedback theory (QFT) combined with Smith predictor (SP) was adopted to achieve engine speed control. Firstly, a high realistic model of naturally aspirated gasoline engine was established in AMESim and the speed characteristic was validated to guarantee the reasonable features. Secondly, the engine nonlinear model was identified under piecewise working conditions so that several linear models with regions of parametric uncertainty were achieved. Thirdly, an optimized Smith predictor model was selected based on two criteria in frequency domain so as to deal with the intake-to-torque uncertain time delay. Finally, based on quantitative feedback theory, an engine speed SP-QFT robust controller was designed to guarantee the robust stability and reference tracking. The simulation results showed that the step responses between the minimum and maximum speeds were of 0.75% overshoot, 0.7 s settling time and 6 r/min steady state error which met the demands of performance requirements of the synchronizer engagement during gear shifting of AMT and obviously improved the system dynamic characteristics compared with QFT controller and PID controller. Moreover, the simple form of SP-QFT controller is convenient to implement in engineering. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 19
Main heading: Speed
Controlled terms: Controllers - Delay control systems - Electric traction - Engines - Feedback - Frequency domain analysis - Hybrid vehicles - Robustness (control systems) - Speed control - Three term control systems - Time delay - Traction motors - Vehicle transmissions
Uncontrolled terms: Parametric uncertainties - Performance requirements - Quantitative feedback theory - Quantitative feedbacks - Smith predictors - Speed characteristics - Speed synchronizations - Uncertain time delay
Classification code: 432 Highway Transportation
Highway Transportation
- 602.2 Mechanical Transmissions
Mechanical Transmissions
- 713 Electronic Circuits
Electronic Circuits
- 731.1 Control Systems
Control Systems
- 731.3 Specific Variables Control
Specific Variables Control
- 732.1 Control Equipment
Control Equipment
- 921.3 Mathematical Transformations
Mathematical Transformations
Numerical data indexing: Percentage 7.50e-01%, Rotational_Speed 6.00e+00RPM, Time 7.00e-01s
DOI: 10.6041/j.issn.1000-1298.2017.02.047
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
8. Modeling and Experiment Verification of Open and Shut Characteristic Detection System for Four-circuit Protection Valve
Accession number: 20172103687700
Authors: Fan, Weijun (1); Zhao, Chenxin (1); Mao, Min (1); Guo, Bin (2); Zhang, Peipei (1)
Author affiliation: (1) College of Metrology Technology and Engineering, China Jiliang University, Hangzhou; 310018, China; (2) Hangzhou Wolei Intelligent Technology Co., Ltd., Hangzhou; 310018, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 385-392
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In the study of open and shut characteristic detection system for four-circuit protection valve, the pipe aperture and pressure acquisition frequency have great influence on the detection result of opening pressure and closing pressure for four-circuit protection valve. There is no relevant research, so it causes that detection results of different detection systems cannot be compared. On the basis of studying mechanical model and flow characteristics model of valve, dynamic process mathematical model and AMESim simulation model of open and shut detection system for four-circuit protection valve were established. Based on the experimental data, the effect of pipe aperture and sampling interval on detection results of open and shut characteristic for four-circuit protection valve was analyzed and verified. Results showed that the greater the intake orifice was, the shorter the opening pressure detection time was, the higher the detection efficiency was, the worse the stability of the data was. The greater the exhaust pipe aperture was, the greater the closing pressure was. The higher the data acquisition frequency was, the better the stability of the data was. When the effective flow area of intake orifice was 0.5 mm2and the system sampling interval was 0.001 s, it can guarantee the detection stability and efficiency of opening pressure detection. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 17
Main heading: Valves (mechanical)
Controlled terms: Data acquisition - Efficiency - Electric network analysis - Mathematical models - Orifices - Pressure distribution - Timing circuits
Uncontrolled terms: Circuit protection - Detection efficiency - Detection system - Experiment verification - Flow charac-teristics - Open and shut characteristic - Pressure acquisitions - Simulation model
Classification code: 601.2 Machine Components
Machine Components
- 703.1.1 Electric Network Analysis
Electric Network Analysis
- 713.4 Pulse Circuits
Pulse Circuits
- 723.2 Data Processing and Image Processing
Data Processing and Image Processing
- 913.1 Production Engineering
Production Engineering
- 931.1 Mechanics
Mechanics
Numerical data indexing: Area 5.00e-07m2, Time 1.00e-03s
DOI: 10.6041/j.issn.1000-1298.2017.02.052
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
9. Visual Navigation for Automatic Guided Vehicles Based on Active Contour Model
Accession number: 20172103687835
Authors: Lin, Guichao (1); Zou, Xiangjun (2); Zhang, Qing (1); Xiong, Juntao (2)
Author affiliation: (1) College of Mechanical and Automotive Engineering, Chuzhou University, Chuzhou; 239000, China; (2) Key Laboratory of Key Technology on South Agricultural Machine and Equipment, Ministry of Education, South China Agricultural University, Guangzhou; 510642, China
Corresponding author: Zou, Xiangjun(xjzou1@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 20-26
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Lane detection and tracking algorithm based on active contour model was proposed to solve the poor robustness and real-time problem for vision navigation under factory or agricultural nonlinear illumination conditions. First of all, it was illustrated that navigation problem was equivalent to calculation of polynomial curve parameters, which could describe the navigation lanes. Secondly, the external energy function of active contour model was investigated, including three energy terms. The first energy term was about the Euclidean distance between lane colors and colors on one side of polynomial curve, by minimizing the first energy term could attract polynomial curve to navigation lanes. The second energy term was about the edge features, which could attract polynomial curve to lane edges. The third energy term was about the position difference of polynomial curve between adjacent frames, which could limit curve to change abruptly. Finally, the energy function was simplified to a nonlinear least squares problem, and the Gauss-Newton method as well as the Armijo-Goldstein inexact line search method were used to solve this problem. Home video and independent car were tested, the result showed that the algorithm achieved a navigation accuracy of 98.96% for both the straight lane and bending lane under nonlinear illumination, with average processing time of 40.18 ms, and the independent car could walk along the navigation lane successfully. Experiment result showed that the algorithm was robust and real-time. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Problem solving
Controlled terms: Automatic guided vehicles - Least squares approximations - Navigation - Newton-Raphson method - Polynomial approximation - Polynomials - Video signal processing
Uncontrolled terms: Active contour model - Euclidean distance - Gauss-Newton methods - Illumination conditions - Inexact line searches - Navigation accuracy - Nonlinear least squares problems - Visual Navigation
Classification code: 716.4 Television Systems and Equipment
Television Systems and Equipment
- 731.6 Robot Applications
Robot Applications
- 921.1 Algebra
Algebra
- 921.6 Numerical Methods
Numerical Methods
Numerical data indexing: Percentage 9.90e+01%, Time 4.02e-02s
DOI: 10.6041/j.issn.1000-1298.2017.02.003
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
10. Data Transmission Method of Pasture Internet of Things Based on Opportunistic Network
Accession number: 20172103687860
Authors: Deng, Xuefeng (1); Sun, Ruizhi (2, 3); Yang, Hua (1); Nie, Juan (2, 4); Wang, Wendi (2)
Author affiliation: (1) College of Information Science and Engineering, Shanxi Agricultural University, Taigu; 030801, China; (2) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (3) Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, China Agricultural University, Beijing; 100083, China; (4) College of Computer and Information Engineering, Beijing University of Agriculture, Beijing; 102206, China
Corresponding author: Sun, Ruizhi(sunruizhi@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 208-214
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Behavior of livestock in a pasture needs to be detected, and motion path and location information of livestock need to be collected in the intelligent pasture management, the acquisition of the above information can be realized by using the pasture Internet of things. The system architecture based on wireless sensor network can meet the communication requirements between different sampling nodes. However, because the location of a pasture is generally remote and network environment is complex, interruption and packet loss often appear in the connection with Internet. Using the traditional network connection mode can lead to a large number of data loss. In order to reduce the loss of sampled data in connection with Internet, a data transmission scheme based on opportunistic network is presented. Moreover, the communication status of sensors in a pasture environment is analyzed and three communication ways between sensors are summed up, which are modeled and analyzed respectively. Under the premise of the sensor limited storage capacity, the calculation method of accessing point density is put forward by using the principle of opportunistic network, and the relationship between livestock movement speed, sensor node storage capacity and data transmission loss rate is summarized, so as to ensure the system data loss in the design to allow for the range. Finally, an experimental evaluation and validation of the theoretical results of the method is given to prove the correctness of this program. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Agriculture
Controlled terms: Data acquisition - Data communication systems - Data transfer - Digital storage - Internet of things - Sensor nodes - Transmissions - Wireless ad hoc networks - Wireless sensor networks
Uncontrolled terms: Experimental evaluation - Livestock movements - Location information - Network environments - Opportunistic networks - Pasture - Pasture management - System architectures
Classification code: 602.2 Mechanical Transmissions
Mechanical Transmissions
- 722 Computer Systems and Equipment
Computer Systems and Equipment
- 723 Computer Software, Data Handling and Applications
Computer Software, Data Handling and Applications
- 723.2 Data Processing and Image Processing
Data Processing and Image Processing
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
DOI: 10.6041/j.issn.1000-1298.2017.02.028
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
11. Near Infrared Spectral Modeling Analysis Based on Variable Selection of Compost Humic Acid Content
Accession number: 20172103687872
Authors: Li, Zigang (1, 2); Yue, Xiaoyu (1); Li, Changbin (1); Zhang, Chunhui (2, 3); Wei, Qingbao (1); Liu, Shiliang (4)
Author affiliation: (1) College of Packaging and Printing Engineering, Henan University of Animal Husbandry and Economy, Zhengzhou; 450011, China; (2) The Henan Province Pig Engineering Technology Research Center for Disease Control and Prevention, Henan University of Animal Husbandry and Economy, Zhengzhou; 450011, China; (3) The Australian Animal Health Laboratory (AAHL), Geelong; 3220, Australia; (4) College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou; 450002, China
Corresponding author: Liu, Shiliang(shlliu70@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 300-304
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Composting treatment is a key method of processing organic solid waste, especially for agricultural organic solid waste. Aiming to study the feasibility of several selected variables from near infrared spectroscopy to quantify humic acid in compost, determine composting fermentation and develop corresponding control equipment to provide theoretical basis by near-infrared diffuse reflection spectrum. Totally 100 composting samples were collected, including 58 samples for calibration and 42 samples for validation. On the one hand, the humic acid of these samples were analyzed by using the International Humic Substances Society standard of humic acid method, on the other hand, those were scanned to obtain near infrared spectra with the wavelength range of 4 000~9 000 cm-1. Both of spectroscopic pre-treatment method and sensitive variables were optimized, and then the model was built by partial least squares regression method.The results indicated that humic acid in compost can be determined by near-infrared (NIR) spectral technique, because they were combined with organic groups with NIR absorption. A method for the determination of humic acid in compost samples was established based on the combination of discrete wavelet transform (DWT) and NIR technique. In the proposed method, the raw NIR data and their wavelet coefficients were used for modeling and prediction of the contents of humic acid in compost by partial least square method (PLS). The model based on wavelet coefficients was better than that based on the full NIR spectral range. With the improved method, accurate prediction can be achieved. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Infrared devices
Controlled terms: Absorption spectroscopy - Biological materials - Composting - Control equipment - Discrete wavelet transforms - Least squares approximations - Near infrared spectroscopy - Organic acids - Principal component analysis - Quality control - Solid wastes - Waste treatment - Wavelet transforms
Uncontrolled terms: Diffuse reflection spectra - Humic acid - Maturity evaluation - Modeling and predictions - Near infrared spectra - Near infrared spectral - Partial least square methods - Partial least squares regression
Classification code: 452.4 Industrial Wastes Treatment and Disposal
Industrial Wastes Treatment and Disposal
- 461.2 Biological Materials and Tissue Engineering
Biological Materials and Tissue Engineering
- 732.1 Control Equipment
Control Equipment
- 804.1 Organic Compounds
Organic Compounds
- 913.3 Quality Assurance and Control
Quality Assurance and Control
- 921.3 Mathematical Transformations
Mathematical Transformations
- 921.6 Numerical Methods
Numerical Methods
- 922.2 Mathematical Statistics
Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2017.02.040
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
12. Path Planning Algorithm for Plant Protection UAVs in Multiple Operation Areas
Accession number: 20172103687842
Authors: Xu, Bo (1, 2); Chen, Liping (1, 3); Xu, Min (1, 3); Tan, Yu (2)
Author affiliation: (1) Beijing Research Center of Intelligent Equipment for Agriculture, Beijing; 100097, China; (2) College of Engineering, China Agricultural University, Beijing; 100083, China; (3) Beijing Key Laboratory of Intelligent Equipment Technology for Agriculture, Beijing Academy of Agriculture and Forestry, Beijing; 100097, China
Corresponding author: Chen, Liping(chenlp@nercita.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 75-81
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: According to multi-area operations, a kind of overall route planning algorithm for plant protection UAVs was developed in order to reduce flight distance in multi-area operations and operating sequence of each area was reasonable allocation to improve operational efficiency and reduce energy consumption of the UAVs. The algorithm was divided into three parts, namely, single area route planning, operating sequences of areas and dispatching route planning among areas. After analyzing a variety of covering operation modes in aspects of operation distance, extra coverage and missed coverage, the UAVs operation mode in single area was determined. Optimized operation sequences of areas were planned based on genetic algorithm and traveling salesman problem (TSP). Dispatching routes among areas were planned based on improved genetic algorithm with binary coding, finally the overall route planning algorithm was achieved. The simulation was performed in an operation of five different irregular areas, numbers of each area were set as A, B, C, D and E. Operation route of each area was planned by using the previously proposed algorithm of route planning algorithm based on operation path angle in irregular, achieving operation start point, end point and node point coordinates of each area. Operation sequences of areas were achieved based on genetic algorithm and TSP, dispatching routes among areas were planned based on the improved genetic algorithm, of which the code was a random five-digit binary sequence, each digit represented arrangement of start point and end point of each area. The simulation result proved feasibility of the multi-area route planning algorithm. Nowadays, unmanned operations becomes trend, this multi-area route planning algorithm not only saves manpower required by route planning, but also makes operation management easier, and it is suitable for autonomous unmanned aerial vehicles and can be widely used in the area of precision agriculture. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 17
Main heading: Motion planning
Controlled terms: Algorithms - Binary sequences - Bins - Energy efficiency - Energy utilization - Genetic algorithms - Point contacts - Traveling salesman problem
Uncontrolled terms: Autonomous unmanned aerial vehicles - Multi areas - Operational efficiencies - Optimized operations - Path-planning algorithm - Plant protection - Precision Agriculture - Reduce energy consumption
Classification code: 525.2 Energy Conservation
Energy Conservation
- 525.3 Energy Utilization
Energy Utilization
- 694.4 Storage
Storage
- 704.1 Electric Components
Electric Components
- 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory
- 912.3 Operations Research
Operations Research
DOI: 10.6041/j.issn.1000-1298.2017.02.010
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
13. Effect of Culture Systems on Salt Accumulation in Substrate and Nutrient Use Efficiency of Tomato
Accession number: 20172103687862
Authors: Xiong, Jing (1, 2); Chen, Qing (1); Wang, Jingguo (1); Liu, Wei (2)
Author affiliation: (1) College of Resources and Environmental Sciences, China Agricultural University, Beijing; 100193, China; (2) Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing; 100097, China
Corresponding author: Liu, Wei(liuwei@nercv.org)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 224-231
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: One of the problems that exists in substrate culture is salt accumulation in root zone, and adequate management of nutrient solution is the primary method to control it. In order to achieve scientific management of nutrient solution, salt accumulation characteristics in root zone need to be studied. A greenhouse experiment was carried out to determine the influence of two systems (open and closed) on electrical conductivity, ion constitution of root solution, nutrient uptake, yield and fruit quality of tomato and nutrient use efficiency. Results showed that electrical conductivity of root solution was increased with the growth of tomato, the highest electrical conductivity in open and closed systems were 11.9 mS/cm and 17.2 mS/cm, respectively. The salt ions in root zone of the two systems were mainly NO3-, K+, Ca2+, Mg2+, SO42-and H2PO4-. The ion imbalance was found in both the open and closed systems, ratios of K+, Ca2+and H2PO4-concentrations to total ion concentration were decreased from the initial while the ratios of Mg2+, NO3-and SO42-were increased. The yield of tomato was decreased with high electrical conductivity in open and closed systems, while the blossom-end rot (BER) of fruit was increased with high electrical conductivity and ion imbalance degree. At the end of the trial, the BER in open and closed systems were 29.7% and 36.6%, respectively. Compared with open system, closed system improved the nutrient use efficiency, the nutrient use efficiencies of N, P, K, Ca, Mg and S were increased by 11.6%, 19.6%, 18.9%, 11.8%, 37.3% and 15.9%, respectively. In conclusion, the salt accumulation and ion imbalance existed in open and closed systems. Increasing the input of K and P while controlling the use of Mg, N and S could help to keep the ion balance of root solution. The closed system was a more promising way to realize environment-friendly, water-saving and fertilizer-saving in substrate culture. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 32
Main heading: Forestry
Controlled terms: Calcium - Efficiency - Electric conductivity - Fruits - Ions - Nutrients - Open systems - Water conservation
Uncontrolled terms: Closed systems - Electrical conductivity - Environment friendly - Greenhouse experiments - High electrical conductivity - Ion composition - Nutrient-use efficiencies - Scientific management
Classification code: 444 Water Resources
Water Resources
- 549.2 Alkaline Earth Metals
Alkaline Earth Metals
- 701.1 Electricity: Basic Concepts and Phenomena
Electricity: Basic Concepts and Phenomena
- 821.4 Agricultural Products
Agricultural Products
- 913.1 Production Engineering
Production Engineering
Numerical data indexing: Electrical_Conductivity 1.19e+00S/m, Electrical_Conductivity 1.72e+00S/m, Percentage 1.16e+01%, Percentage 1.18e+01%, Percentage 1.59e+01%, Percentage 1.89e+01%, Percentage 1.96e+01%, Percentage 2.97e+01%, Percentage 3.66e+01%, Percentage 3.73e+01%
DOI: 10.6041/j.issn.1000-1298.2017.02.030
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
14. Ultrafiltration Recovery of Skim Protein from Enzyme-assisted Aqueous Extraction Process of Soybean and Its Functional Properties
Accession number: 20172103687876
Authors: Jiang, Lianzhou (1); Zhang, Qiaozhi (1); Li, Yang (1); Wang, Zhongjiang (1); Qi, Baokun (1); Sui, Xiaonan (1)
Author affiliation: (1) College of Food Science, Northeast Agricultural University, Harbin; 150030, China
Corresponding author: Sui, Xiaonan(xiaonan.sui@neau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 327-334
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Enzyme-assisted aqueous extraction processing (EAEP) has long been considered as a promising alternative to traditional solvent oil extraction, which has gained increasing attention recently. After EAEP of soybeans, three distinct layers are formed: cream, skim and residual fraction. The skim fraction contains substantial amount of protein as well as oil, sugar and other impurities. In order to recover value from this liquid fraction, ultrafiltration was employed for protein concentration and isolation. To investigate the interrelationship between operating parameters and membrane flux, Box-Behnken response surface methodology was introduced. The results indicated that the three factors’ effects on membrane flux followed the decreasing order as: solution mass fraction, transmembrane pressure and solution pH value. The improved regression model was fitted with determination coefficient of 0.997 5 and optimal factors were as follows: operative pressure of 0.20 MPa, solution mass fraction of 5.60%, and solution pH value of 8.50. The permeate flux under above conditions was 7.02 L/(m2•h) and protein purity was increased to 88.63%. The infrared spectrum and HPLC analysis showed evidently characteristic peaks of functional groups in soybean protein and remarkable low levels of undigestible oligosaccharides. Besides, the protein extracted from EAEP showed improved solubilities especially at acidic pH value, but it slightly decreased emulsifying activity index and emulsifying stability index. Further improvement can be achieved if industrial fractionation unit was employed and process optimization was conducted. A complete cost-effectiveness analysis would also need to be done to estimate the economic viability of this application. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Proteins
Controlled terms: Cost effectiveness - Emulsification - Enzymes - Extraction - Optimization - pH - Process control - Regression analysis - Ultrafiltration
Uncontrolled terms: Cost effectiveness analysis - Determination coefficients - Emulsifying activity indices - Enzyme-assisted aqueous extractions - Functional properties - Response surface methodology - Soybean proteins - Transmembrane pressures
Classification code: 801.1 Chemistry, General
Chemistry, General
- 802.3 Chemical Operations
Chemical Operations
- 804.1 Organic Compounds
Organic Compounds
- 911.2 Industrial Economics
Industrial Economics
- 921.5 Optimization Techniques
Optimization Techniques
- 922.2 Mathematical Statistics
Mathematical Statistics
Numerical data indexing: Percentage 5.60e+00%, Percentage 8.86e+01%, Pressure 2.00e+05Pa
DOI: 10.6041/j.issn.1000-1298.2017.02.044
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
15. Design and Test of Electronic Control Seeding System for Maize
Accession number: 20172103687839
Authors: Zhang, Chunling (1, 2); Wu, Rong (1); Chen, Liqing (1)
Author affiliation: (1) School of Engineering, Anhui Agricultural University, Hefei; 230036, China; (2) College of Engineering, Huazhong Agricultural University, Wuhan; 430070, China
Corresponding author: Chen, Liqing(lqchen@ahau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 51-59
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: When the traditional maize seeder works in the field, the power of seed metering device comes from ground steel. Aiming at the problem that the field conditions are so complicated that the ground steel will skid easily, then the miss index will be increased, an electronic maize sowing control system was designed. The police traffic radar collected the sowing operation speed when the sowing was started, then the control system will calculate the seed metering device rotational speed combined with the theoretical particle distance. The rotary encoder collected the seed metering device rotational speed, then the controller would process speed based on control strategy and obtained the last speed. The optimal process of control strategy can improve the accuracy. The results of the field test showed that when the electronic control seed metering device was working in the field, the average qualified index was 92.40%, which was increased by 3.63 percentage points compared with the traditional sowing. The average miss index was 4.82% and it was reduced by 2.04 percentage points compared with the traditional sowing. The variability of seed-spaces was less than 4.20% and the sowing effects were much more than the national standard. When the speed of sowing was more than 10km/h, the effects was worse than other cases, therefore some improvement on the structure to improve the accuracy. The design of the electronic control maize seed metering device provided some definite reference for study of sowing control system. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Process control
Controlled terms: Control systems - Industrial electronics - Pneumatic materials handling equipment - Seed - Servomechanisms - Speed
Uncontrolled terms: Control strategies - Electronic controls - Field conditions - National standard - Particle distance - Percentage points - Precision maize planter - Seed metering devices
Classification code: 632.4 Pneumatic Equipment and Machinery
Pneumatic Equipment and Machinery
- 705 Electric Generators and Motors
Electric Generators and Motors
- 731.1 Control Systems
Control Systems
- 821.4 Agricultural Products
Agricultural Products
Numerical data indexing: Percentage 4.20e+00%, Percentage 4.82e+00%, Percentage 9.24e+01%, Velocity 2.78e+00m/s
DOI: 10.6041/j.issn.1000-1298.2017.02.007
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
16. Multi-objective Evolutionary Algorithm Based on Orthogonal Designing Model
Accession number: 20172103687881
Authors: Wu, Jinmei (1); Wang, Yahui (1); Jia, Chenhui (2)
Author affiliation: (1) College of Mechanical Engineering, North China University of Water Resources and Electric, Zhengzhou; 450011, China; (2) College of Mechanical Engineering, Henan University of Science and Technology, Luoyang; 471023, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 362-369 and 392
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming to improve the convergence and diversity of multi-objective evolutionary algorithms (MOEAs) for solving complicated high dimensional multi-objective optimization problems, a multi-objective evolutionary algorithm based on orthogonal designing model (MOEA/D-OD) was proposed. Under the framework of multi-objective evolutionary algorithm with decomposition scheme as typical characteristics, the orthogonal designing model (ODM) was incorporated into decomposition mechanism. By utilizing ODM, the good genes carried by the recombinant parents were obtained by offspring to avoid blindness of searching to improve the convergence of the proposed algorithm. The decomposition mechanism was applied to selection to balance exploitation and exploration. MOEA/D-OD was compared with four state-of-the-art MOEAs on 18 benchmark testing problems. Experimental results indicated that MOEA/D-OD can obtain good convergence while having uniform distribution and wild coverage for Pareto sets. The searching performance can stay well when solving complex problems with complicated PS. To validate its performance on constraint multi-objective optimization problems, the proposed MOEA/D-OD was applied to solve the I-beam with two conflict objectives. Compared with other algorithms, the uniformly distributed Pareto sets obtained by MOEA/D-OD showed its practicability for engineering problems, which was an effective approach for solving high dimensional and complicated multi-objective optimization problems. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Evolutionary algorithms
Controlled terms: Multiobjective optimization - Odor control - Optimization - Problem solving
Uncontrolled terms: Decomposition mechanism - Decomposition scheme - Exploitation and explorations - I beams - MOEA/D - Multi objective evolutionary algorithms - Multi-objective optimization problem - Searching performance
Classification code: 921.5 Optimization Techniques
Optimization Techniques
DOI: 10.6041/j.issn.1000-1298.2017.02.049
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
17. Uniformity of Fixed Spray-plate Sprinkler under Windy Condition Based on Ballistic Simulation
Accession number: 20172103687844
Authors: Zhang, Yisheng (1); Zhu, Delan (1, 2); Song, Bo (1); Zhang, Lin (2)
Author affiliation: (1) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Institute of Water Saving Agriculture in Arid Areas, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Zhu, Delan(dlzhu@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 91-97 and 81
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to simulate fixed spray-plate sprinkler water distribution and Christiansen uniformity (CU) under open field conditions, the method for calculating water distribution was proposed by applying droplet size distribution, simulation of droplet distribution utilize droplet trajectory computations and wind-distored model. The accuracy of water distributions of Nelson D3000 spray sprinkler was validated by comparing simulated with observed patterns, it was found that the software appeared to be an effective predictor of sprinkler performance in wind. Under this premise, the water distribution was simulated at different wind speeds with 4.76 mm nozzle diameters (24#), the factors, including wind speed, wind direction, sprinkler spacing, working pressure and riser height, which may affect CU, the wind drift and evaporation losses (WDEL) under different working conditions were analyzed. The results showed that sprinkler spacing had the most important influence on CU at 95% confidence interval, and it was followed by riser height and working pressure, wind speed and wind direction did not significantly affect CU. Increasing wind speed, working pressure or riser height indicated an increase in the OWDEL, and working pressure can dramatically affect the OWDEL on account of smashing large water droplet to pieces. Using this sprinkler, the lateral moving irrigation system can attain a high uniformity coefficient at 2.13~3.14 m sprinkler spacing along the lateral when the wind speed was lower than 6 m/s, and with this range of mounting spacing, increasing sprinkler riser height or working pressure cannot promote a higher CU distinctly, low working pressure was recommended considering little cost in the design of the sprinkler irrigation system. In addition, decreasing the riser height can reduce WDEL effectively, in order to increase water use efficiency, low height cooperated with plant height was reasonable. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 14
Main heading: Sprinkler systems (irrigation)
Controlled terms: Ballistics - Drops - Irrigation - Speed - Water supply systems - Wind
Uncontrolled terms: Droplet distribution - Droplet size distributions - Droplet trajectories - Fixed spray-plate sprinkler - Sprinkler irrigation - Water distributions - Wind drift and evaporation loss - Windy conditions
Classification code: 404.1 Military Engineering
Military Engineering
- 443.1 Atmospheric Properties
Atmospheric Properties
- 446.1 Water Supply Systems
Water Supply Systems
- 821.1 Agricultural Machinery and Equipment
Agricultural Machinery and Equipment
- 821.3 Agricultural Methods
Agricultural Methods
Numerical data indexing: Percentage 9.50e+01%, Size 2.13e+00m to 3.14e+00m, Size 4.76e-03m, Velocity 6.00e+00m/s
DOI: 10.6041/j.issn.1000-1298.2017.02.012
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
18. Fe, Co and Cu Modified HZSM-5 Catalysts for Online Upgrading of Pyrolysis Vapors from Rape Straw
Accession number: 20172103687873
Authors: Li, Xiaohua (1); Wang, Jiajun (1); Fan, Yongsheng (1); Liu, Sha (1); Cai, Yixi (1)
Author affiliation: (1) School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang; 212013, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 305-313
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The Fe, Co and Cu modified HZSM-5 zeolites were prepared via impregnation method and the modified catalysts were characterized by XRD, Py-IR and BET methods. Then online catalytic upgrading of rape straw pyrolysis vapors was performed over the modified catalysts to investigate their catalytic upgrading performance and anti coking performance. The results showed that loadings of Fe, Co and Cu were well-distributed, the acid distributions on the HZSM-5 were influenced differently by Fe, Co and Cu, and the channels were modified with the decrease of pore volume. The bio-oil yields were decreased with the increase of physicochemical properties after upgrading by employing the modified HZSM-5. The yield, oxygen content, pH value, dynamic viscosity and high heating value (HHV) of bio-oil obtained by using Fe, Co and Cu/HZSM-5 were 18.37%~19.03%, 15.13%~17.23%, 5.05~5.12, 5.16~5.22 mm2/s and 34.56~36.01 MJ/kg, respectively. The refined bio-oil was composed of a variety of organic compounds which was indicated by many kinds of chemical functional groups, the content of hydrocarbons in refined bio-oil was increased significantly. Aromatization performances of Fe/HZSM-5, Co/HZSM-5 and Zn/HZSM-5 were improved and contents of the polycyclic aromatic hydrocarbons (PAHs) were obviously increased. And after catalytic upgrading by Fe/HZSM-5 and Co/HZSM-5, the contents of the monocyclic aromatic hydrocarbons (MAHs) were relatively high. Resistance performances of Fe/HZSM-5 and Co/HZSM-5 for amorphous coke were relatively strong, while that of Co/HZSM-5 for graphite coke was enhanced obviously. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Iron compounds
Controlled terms: Aromatic compounds - Aromatic hydrocarbons - Aromatization - Biofuels - Catalysts - Chemical compounds - Coke - Hydrocarbons - Polycyclic aromatic hydrocarbons - Pyrolysis
Uncontrolled terms: Bio oil - Catalytic upgrading - Chemical functional groups - H-ZSM-5 - Impregnation methods - Monocyclic aromatic hydrocarbons - Physicochemical property - Polycyclic aromatic hydrocarbons (PAHS)
Classification code: 524 Solid Fuels
Solid Fuels
- 802.2 Chemical Reactions
Chemical Reactions
- 803 Chemical Agents and Basic Industrial Chemicals
Chemical Agents and Basic Industrial Chemicals
- 804 Chemical Products Generally
Chemical Products Generally
- 804.1 Organic Compounds
Organic Compounds
Numerical data indexing: Specific_Energy 3.46e+07J/kg to 3.60e+07J/kg
DOI: 10.6041/j.issn.1000-1298.2017.02.041
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
19. Pressure Fluctuation Characteristics in Inter-stage Flow Channel of Double-inlet Two-stage Double-suction Centrifugal Pump
Accession number: 20172103687849
Authors: Ye, Changliang (1); Wang, Fujun (1, 2); Li, Huaicheng (3); Li, Zhentan (3); Song, Qingsong (3)
Author affiliation: (1) College of Water Resources and Civil Engineering, China Agricultural University, Beijing; 100083, China; (2) Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, China Agricultural University, Beijing; 100083, China; (3) Shanghai Liancheng Group Company, Shanghai; 201812, China
Corresponding author: Wang, Fujun(wangfj@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 126-134
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Double-inlet two-stage double-suction centrifugal pump is a new type of pump, which has large flow rate and high head. The inter-stage flow channel of a double-inlet two-stage double-suction centrifugal pump is located between the first-stage single-suction impeller and the second-stage double-suction impeller. It is divided into forward channel, bridge and reverse channel. The rotor-stator interaction between the inter-stage flow channel and the impellers may be one of the main causes of pressure fluctuation. The forward channel is twin-volute type, and the reverse channel is double spiral type with a guide vane. The bridge is three dimensional distortion connecting the forward channel and reverse channel. The three-dimensional unsteady flow field of double-inlet two-stage double-suction centrifugal pump is studied by using CFD method, and the pressure fluctuation mechanism is analyzed. In the forward channel, the static pressure distribution is closely related to twin-volute type with 180° symmetric distribution under all flow conditions. The blade passing frequency is the main frequency of pressure fluctuation, and the maximum amplitude appears near the tongue. Under low flow rate conditions, the main frequency amplitude of pressure fluctuation is significantly higher than that under design conditions, which is about 1.8 times as that under design conditions. In the bridge area, the main frequency of pressure fluctuation is blade passing frequency under all the conditions. Under design condition, the main frequency of pressure fluctuation of inlet of the inner surface reaches the maximum along the flow direction, while that of outer surface has the reverse rule. In the reverse channel, the main frequency of pressure fluctuation is the blade passing frequency under design conditions, whose amplitude along the flow direction is gradually increased. The fluctuation amplitude in the outlet is about 1.1 times as that in the inlet. Under low flow rate conditions, the low-frequency component and the periodic vortex nearby the guide vane are found. The research result provides a basis for improving the hydraulic design and the operation stability of double-inlet two-stage double-suction centrifugal pump. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Computational fluid dynamics
Controlled terms: Centrifugal pumps - Channel flow - Impellers - Unsteady flow
Uncontrolled terms: Double inlet - Double-suction centrifugal pumps - Flow channels - Low-frequency components - Pressure fluctuation - Rotor-stator interactions - Static pressure distributions - Three-dimensional unsteady flow
Classification code: 601.2 Machine Components
Machine Components
- 618.2 Pumps
Pumps
- 631.1 Fluid Flow, General
Fluid Flow, General
- 723.5 Computer Applications
Computer Applications
DOI: 10.6041/j.issn.1000-1298.2017.02.017
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
20. Optimization of Structural Parameters of Subsoiler Based on Soil Disturbance and Traction Resistance
Accession number: 20172103687840
Authors: Liu, Jun’an (1); Wang, Xiaoyan (1); Li, Hongwen (1); He, Jin (1); Wang, Qingjie (1); Li, Wenying (1)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China
Corresponding author: Wang, Xiaoyan(xywang@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 60-67
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: As one of the key technologies of conservation tillage, subsoiling has been widely promoted in northern China, while the large traction resistance and high energy consumption of subsoiling is the main problem of subsoiling. The structural parameters of subsoiler, which included spade shape, penetrating angle and wingspan angle, had significant effects on the soil property of subsoiling trench and the traction resistance of subsoiler. In order to investigate the effect on the soil physical properties (bulk density, soil porosity and cone index) of subsoiling trench in 0~40 cm depth, calculate the subsoiling trench cross-sectional area (TCA) and the traction resistance of subsoilers, and make optimization for the key structural parameters of subsoiler, the chisel-shape subsoiler (CS), arrowhead-shape subsoiler (AS) and wing-shape subsoiler (WS) were designed and tested under no-tillage conditions. Orthogonal experiment was conducted in spring maize ridge-tillage area which was located in Zhangwu county, Liaoning province in Northeast China. The trench specific resistance (TSR) of the above three subsoilers had also been calculated. The results indicated that penetrating angle α and wingspan angle β had no significant effect on the change of soil physical properties, TCA and TSR, while the change of α had a significant influence on the traction resistance, and it would be the minimum subsioler when α was 21°. The spade shape of subsoilers affected soil physical properties, TCA, traction resistance and TSR significantly. The soil disturbance extent of subsoiling and TCA were increased in accordance with the order of CS, AS and WS. TCA for WS was greater than those for CS and AS by 49.8% and 30.0%, respectively, and TCA for AS was greater than that for CS by 15.3%(P<0.05). However, the traction resistance for WS was greater than those for CS and AS by 123.6% and 36.6%, respectively, and the traction resistance for AS was greater than that for CS by 63.7%(P<0.05). TSR was significantly affected by the spade shape, and it was increased with the order of CS, AS and WS. TSR for CS was less than those for AS and WS by 42.4% and 50.2%, respectively, and TSR for AS was less than that for WS by 5.4%. The analysis result showed that if it was just to get relatively more soil disturbance, WS would be the best choice when its penetrating angle α was 21°. While taking subsoiling trench’s soil properties, TCA and traction resistance, especially TSR into consideration, the relatively best subsoiler was chisel-shape subsoiler (CS) when its penetrating angle α was 21°. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Cultivation
Controlled terms: Agricultural machinery - Agriculture - Energy utilization - Physical properties - Porosity - Soil conservation - Soils - Structural optimization - Tools
Uncontrolled terms: High energy consumption - Orthogonal experiment - Penetrating angle - Soil disturbances - Soil physical property - Subsoiling - Traction resistance - Trench specific resistances
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 525.3 Energy Utilization
Energy Utilization
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 921.5 Optimization Techniques
Optimization Techniques
- 931.2 Physical Properties of Gases, Liquids and Solids
Physical Properties of Gases, Liquids and Solids
Numerical data indexing: Percentage 1.24e+02%, Percentage 3.00e+01%, Percentage 3.66e+01%, Percentage 4.24e+01%, Percentage 4.98e+01%, Percentage 5.02e+01%, Percentage 5.40e+00%, Size 0.00e+00m to 4.00e-01m
DOI: 10.6041/j.issn.1000-1298.2017.02.008
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
21. Experiment on Piezoelectric Plate Array Energy Harvester Excited by Alternate High Air Pressure with Constantly Gaseous Mass
Accession number: 20172103687703
Authors: Cheng, Tinghai (1); Wang, Yingting (1); Fu, Xianpeng (1); Zhao, Hongwei (2); Bao, Gang (3); Zhao, Xilu (4)
Author affiliation: (1) School of Mechatronic Engineering, Changchun University of Technology, Changchun; 130012, China; (2) School of Mechanical Science and Engineering, Jilin University, Changchun; 130025, China; (3) School of Mechatronic Engineering, Harbin Institute of Technology, Harbin; 150080, China; (4) Department of Mechanical Engineering, Saitama Institute of Technology, Saitama; 3690293, Japan
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 407-412
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A piezoelectric plate array energy harvester was proposed, which was excited by constant mass compressed gas, and the alternate high air pressure can be recovered. The structure of the system and working principle of the presented harvester were introduced, and the theoretical and experiment were analyzed. The theoretical analysis results showed that the piezoelectric plate had high bearing capacity and it can collect the compressed gas energy effectively. The piezoelectric harvester was subjected by various parameters such as compression volume and compression speed. The expected effect can be adjusted by changing different parameters. The diameter and thickness of piezoelectric unimorph were 12 mm and 0.2 mm, respectively. The diameter and distance of cylinder were 63 mm and 150 mm and the prototype were fabricated. The test system was built to research the rules and performances of piezoelectric array energy harvester. In the test, the pressure, cycle and flow were adjusted. Experimental results showed that the output voltage was simultaneously increased with the increase of flow when the pressure was fixed. With the increase of parallel number of piezoelectric plates, the output power was increased either. It had optimal effect when the five piezoelectric plates were parallel connected. The optimal load resistance was 3 MΩ and instantaneous power was 6.53 μW under the five piezoelectric plates parallel. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Piezoelectricity
Controlled terms: Atmospheric pressure - Energy harvesting - Piezoelectric devices - Plates (structural components)
Uncontrolled terms: Air pressures - Energy Harvester - Energy transformation - Gaseous mass - Piezoelectric arrays - Piezoelectric harvester - Piezoelectric plate - Piezoelectric unimorph
Classification code: 408.2 Structural Members and Shapes
Structural Members and Shapes
- 443.1 Atmospheric Properties
Atmospheric Properties
- 525.5 Energy Conversion Issues
Energy Conversion Issues
- 701.1 Electricity: Basic Concepts and Phenomena
Electricity: Basic Concepts and Phenomena
Numerical data indexing: Electrical_Resistance 3.00e+06Ohms, Power 6.53e-06W, Size 1.20e-02m, Size 1.50e-01m, Size 2.00e-04m, Size 6.30e-02m
DOI: 10.6041/j.issn.1000-1298.2017.02.055
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
22. Space Difference Analysis of Cultivated Land Quality Grade in Beijing-Tianjin-Hebei Region
Accession number: 20172103687852
Authors: Li, Pengshan (1); Du, Zhenbo (1); Zhang, Chao (1); Yun, Wenju (2); Yang, Jianyu (1); Zhu, Dehai (1)
Author affiliation: (1) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory for Agricultural Land Quality Monitoring and Control, Ministry of Land and Resources, Beijing; 100035, China
Corresponding author: Zhang, Chao(zhangchaobj@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 150-157
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Analyzing the characters of spatial distribution in cultivated land quality of Beijing-Tianjin-Hebei region is important to protect and coordinate the development of regions. The mean grade in each index area was calculated with annual database of 2013 about the cultivated land quality by using the weighted average method. Moreover, the deviation between grades was calculated by mean dichotomy method and grade dispersions in each counties by variance. The results showed that the mean grades were under 8 and the cultivated land qualities were lower than the national average of 9.8. Particularly, the average grade of Beijing was slightly higher than those of Tianjin and Hebei. Physical quality grade deviation was ranged from -3.08 to 4.90, and utilization quality grade was ranged from -5.97 to 5.16, economic quality composition grade was ranged from -5.99 to 4.24. The deviation of cultivated land quality grade for more than 80% of the region was within ±2. The utilization quality grade variance was ranged from 0 to 6.13. The plain areas had large variances and the plateau areas had small changes. The results of space difference analysis showed that the physical quality of cultivated land was slightly better than that of plain areas, but its utilization level and economic efficiency were obviously different. The western mountains area, northern mountains area and Bashang Plateau area had high potential to increase the cultivated land’s qualities, although the natural condition and infrastructure should be enhanced. The mean dichotomy was proposed to set cultivated land quality goals after land consolidation. And the variance was put forward to divide land consolidation region, which can be a reference for choosing priority zoning. The research could be referred for well-facilitated farmland construction, improvement of medium or low-yield cultivated land and selection of priority zone. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Quality control
Controlled terms: Land use - Landforms
Uncontrolled terms: Beijing-tianjin-hebei regions - Cultivated land qualities - Factor index area - Mean dichotomy - Space difference
Classification code: 403 Urban and Regional Planning and Development
Urban and Regional Planning and Development
- 481.1 Geology
Geology
- 913.3 Quality Assurance and Control
Quality Assurance and Control
Numerical data indexing: Percentage 8.00e+01%
DOI: 10.6041/j.issn.1000-1298.2017.02.020
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
23. Remote Sensing on Spatio-temporal Evolution of Vegetation Cover in the Yellow River Basin during 1982-2013
Accession number: 20172103687856
Authors: He, Zhen (1); He, Junping (1, 2)
Author affiliation: (1) College of Environment and Planning, Shangqiu Normal University, Shangqiu; 476000, China; (2) College of Urban and Environmental Science, Northwest University, Xi’an; 710127, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 179-185
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: It is an important way to understand the change of land resources and the environment by studying vegetation dynamic change and spatial-temporal evolution, which has important sense to improve the ecological environment scientifically. The spatial-temporal variation of vegetation cover in the Yellow River Basin was analyzed with mean method, variation coefficient method, trend analysis method and Hurst index, based on GIMMS-NDVI time series data (1982-2013). The results showed that the peaks of monthly average NDVI over the last 32 years were occurred mainly in the period of May to September from 1982 to 2013 in the Yellow River Basin, and the maximum was 0.546 in August. In annual variation, the vegetation cover had an increasing trend at the rate of 0.018/(10 a). In the NDVI variation, the low fluctuation of NDVI was in leading position in the Yellow River Basin during 1982-2013, the area with variation coefficient less than 0.1 accounted for 53.88% of the total area. In spatial distribution of annual average of NDVI, the vegetation distribution pattern presented a stepped increasing trend from north to south. The area with mean annual of NDVI less than 0.4 accounted for 24.65% of the total area in the Yellow River Basin, and about 45.73% in better vegetation cover with mean annual of NDVI more than 0.6. In changing trend, as a whole, the vegetation cover showed a trend towards improvement over the last 32 years in the Yellow River Basin. Areas showing a trend towards improvement accounted for about 59.49% of the total area, and the area with no change accounted about 33.96%. In sustainable changes, the future changing type of vegetation cover would be unchanged and continuously improved, which accounted for 33.56% and 58.81% of the total area in the Yellow River Basin, respectively. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Vegetation
Controlled terms: Remote sensing - Rivers - Time series analysis - Watersheds
Uncontrolled terms: Ecological environments - NDVI - Spatial-temporal evolution - Spatiotemporal evolution - Variation coefficient - Vegetation cover - Vegetation distribution - Yellow River basin
Classification code: 444.1 Surface Water
Surface Water
- 922.2 Mathematical Statistics
Mathematical Statistics
Numerical data indexing: Age 3.20e+01yr, Percentage 2.46e+01%, Percentage 3.36e+01%, Percentage 3.40e+01%, Percentage 4.57e+01%, Percentage 5.39e+01%, Percentage 5.88e+01%, Percentage 5.95e+01%
DOI: 10.6041/j.issn.1000-1298.2017.02.024
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
24. Downy Mildew Diagnosis System for Greenhouse Cucumbers Based on Image Processing
Accession number: 20172103687858
Authors: Ma, Juncheng (1); Wen, Haojie (2); Li, Xinxing (1, 2); Fu, Zetian (2); Lü, Xiongjie (3); Zhang, Lingxian (1)
Author affiliation: (1) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (2) Beijing Laboratory of Food Quality and Safety, Beijing; 100083, China; (3) Information Institute, Tianjin Academy of Agricultural Sciences, Tianjin; 300192, China
Corresponding author: Zhang, Lingxian(zhanglx@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 195-202
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Downy mildew is one of the most common diseases suffered by greenhouse cucumbers, which may decrease the quality of greenhouse cucumbers and cause great economical loss to the farmers. In order to increase the accuracy of downy mildew diagnosis for greenhouse cucumbers, a downy mildew diagnosis system for greenhouse cucumbers was designed based on image processing. Focusing on the disease spots images captured in greenhouse field, the conditional random fields (CRF) based on segmentation method was utilized for the system to achieve disease spots images. When building the CRF model, decision tree model was used to extend unary potential function, which could effectively improve the accuracy of segmentation. The post-segmentation images and the disease spots images were transferred to HSV color space, and then 25 features, including color, texture and morphology features, were extracted. A subset of features was generated by rough set method. Finally, the RBF based SVM was used for the system to identify the greenhouse cucumber downy mildew. Taking cucumber downy mildew images obtained in greenhouse from agricultural innovation base of institute of plant protection, Tianjin academy of agricultural sciences as an example, the system was tested. The results showed that the segmentation method used by the system could effectively segment the disease spots images, which managed to overcome the noise caused by the illumination and complex background. A subset of 12 features was obtained by rough set method from the original feature set of 25 features, which improved the efficiency of the system. The identification accuracy of cucumber downy mildew reached 90%, which indicated that the downy mildew diagnosis system could meet the requirement of identification for greenhouse cucumbers. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Image processing
Controlled terms: Agriculture - Color - Decision trees - Diagnosis - Fungi - Greenhouses - Image segmentation - Random processes - Rough set theory
Uncontrolled terms: Conditional random field - Cucumber downy mildews - Decision tree modeling - Diagnosis systems - Downy mildew - Greenhouse cucumbers - Identification accuracy - Segmentation methods
Classification code: 461.6 Medicine and Pharmacology
Medicine and Pharmacology
- 741.1 Light/Optics
Light/Optics
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 821.6 Farm Buildings and Other Structures
Farm Buildings and Other Structures
- 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
Combinatorial Mathematics, Includes Graph Theory, Set Theory
- 922.1 Probability Theory
Probability Theory
Numerical data indexing: Percentage 9.00e+01%
DOI: 10.6041/j.issn.1000-1298.2017.02.026
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
25. Qualitative Potential Calculation of Arable Land Consolidation Based on Limiting Factors and Hot Spot Analysis
Accession number: 20172103687853
Authors: Zhao, Dongling (1); He, Shanshan (1); Yang, Jianyu (1, 2); Zhang, Chao (1, 2); Li, Pengshan (1, 2); Du, Zhenbo (1)
Author affiliation: (1) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory for Agricultural Land Quality Monitoring and Control, Ministry of Land and Resources, Beijing; 100035, China
Corresponding author: Yang, Jianyu(ycjyyang@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 158-164 and 157
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Land consolidation can excavate the potential of arable land quality effectively. In order to calculate the potential of arable land quality scientifically and reasonably and guide corresponding land consolidation projects, a new method was proposed based on limiting factors and hot spot analysis. Zhuozhou city was chosen as the study area for experiment with space grid as basic unit. Firstly, element association method was used to analyze factors influencing arable land natural quality. Secondly, an index system was established to response to arable land utilization level and calculated one by one, and then hot spot analysis was adopted to find low values cluster area. Thirdly, land consolidation projects were carried out to figure out the influence of changes of limiting factors and improvement of indicator values. Eventually, potential of arable land quality was calculated to examine the effects after limiting factors changing and indicator values improving. The results showed that physical quality grade index could be improved by an average of 408. Irrigation was the top limiting factor of arable land natural quality and the overall utilization levels of arable lands in Zhuozhou city were varied widely with the characteristics of both eastern and western areas being higher than that of the central region. It was put forward to carry out water-saving irrigation in low irrigation areas and to carry out corresponding measures in cold spot cluster areas, such as building arable land roads, arable land shelterbelts and irrigation systems. Statistically significant cold spots of arable land space form score located in north-central areas, these areas should strengthen arable land leveling. Statistically significant cold spots of rural roads located in northern and western areas, these areas should be recommended to strengthen the construction of roads. Statistically significant cold spots of ditches throughout the central region of Zhuozhou, from south to north, these areas should strengthen the construction of ditch. The method proposed was helpful to determine the limiting factors, divide zones of arable land consolidation and provide relevant measures. The result was an important gist for regional land consolidation planning, land consolidation project as well as land consolidation zone dividing. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Quality control
Controlled terms: Agriculture - Factor analysis - Irrigation - Land use - Transportation - Water conservation
Uncontrolled terms: Corresponding measures - Element associations - Grid - Hot spot - Land consolidation planning - Land consolidations - Limiting factors - Water-saving irrigation
Classification code: 403 Urban and Regional Planning and Development
Urban and Regional Planning and Development
- 444 Water Resources
Water Resources
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 821.3 Agricultural Methods
Agricultural Methods
- 913.3 Quality Assurance and Control
Quality Assurance and Control
- 922.2 Mathematical Statistics
Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2017.02.021
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
26. Optimization of Continuous Air-recirculation Process for Ammonia Removal by Response Surface Methodology
Accession number: 20172103687870
Authors: Pang, Changle (1); Bai, Linjie (1); Liu, Liang (2)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Tianjin Municipal Biomass Solid Waste Resources Technology and Engineering Center, Nankai University, Tianjin; 300350, China
Corresponding author: Liu, Liang(liuliang198104@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 288-293
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Anaerobic digestate of pig manure has the characteristics of continuous and quantitative poly. The effluent of anaerobic digestate contains a large amount of ammonia nitrogen. The processing capacity of the two stage air-recirculation stripping process is difficult to meet industrial requirements for treatment of anaerobic digestate of pig manure. Gas flow rate, liquid flow rate and gas-liquid ratio were chosen as running parameters of continuous air-recirculation process. The running parameters were studied and the process was optimized by response surface methodology. The initial ammonia nitrogen concentration of anaerobic digestate was (1 444±37) mg/L. Ammonia nitrogen removal rate could reach (66.81±0.24)% when the gas flow rate, liquid flow rate and gas-liquid ratio were 530 L/h, 445 mL/h and 2 036, respectively, which was the best optimal parameters combination. The model optimized by response surface methodology could well analyze and predict ammonia nitrogen removal efficiency of continuous air-recirculation process for treating anaerobic digestate of pig manure. Gas-liquid ratio was the limiting factor for the process of continuous air-recirculation stripping process. According to perturbation plots of ammonia removal efficiency, the influence order from large to small of the three selected parameters for removal ability of ammonia nitrogen was gas-liquid ratio, liquid flow rate and gas flow rate. The process could be used to strip and recover ammonia nitrogen from anaerobic digestate of pig manure. It could reduce foaming tendency of treated fluid and the foams could be broken more quickly than the two stage air-recirculation stripping process. The process could reduce the height of stripping tower and investment of engineering. The result can provide some references for the continuous processing for anaerobic digestate of pig manure. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Nitrogen
Controlled terms: Air - Ammonia - Efficiency - Effluents - Fertilizers - Flow of gases - Flow rate - Gases - Liquids - Manures - Nitrogen removal - Stripping (removal) - Surface properties
Uncontrolled terms: Air re-circulation - Ammonia removal - Digestate - Pig manures - Response surface methodology
Classification code: 452.3 Industrial Wastes
Industrial Wastes
- 631 Fluid Flow
Fluid Flow
- 631.1.2 Gas Dynamics
Gas Dynamics
- 804 Chemical Products Generally
Chemical Products Generally
- 804.2 Inorganic Compounds
Inorganic Compounds
- 821.5 Agricultural Wastes
Agricultural Wastes
- 913.1 Production Engineering
Production Engineering
- 951 Materials Science
Materials Science
DOI: 10.6041/j.issn.1000-1298.2017.02.038
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
27. Microstructure and Chemical Properties of Particulate from Diesel Engine Fueled with Ce-based FBC Fuel
Accession number: 20172103687878
Authors: Liu, Junheng (1); Sun, Ping (1); Ji, Qian (1); Su, Wenbo (2); Xiao, Xue (1); Yao, Xiaohua (1)
Author affiliation: (1) School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang; 212013, China; (2) China National Heavy Duty Truck Group Co., Ltd., Hangzhou; 311231, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 342-347 and 293
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to remove the deposited particles inside diesel particulate filter (DPF) and realize the DPF regeneration, fuel borne catalyst (FBC) additive is thought to promote diesel particle combustion with the active metal component in fuel. FBC can reduce the particulate ignition temperature, and also decrease the peak temperature of regeneration process. Naphthenic acid cerium solution was selected as FBC, which was blended with diesel by the ratios of 50 mg/kg, 100 mg/kg, 150 mg/kg and 300 mg/kg (Ce mass fraction) and marked as F50, F100, F150 and F300, respectively. The particulate physicochemical properties of a common rail engine fueled with Ce-based FBC were studied by using thermosgravimetric analysis, gas chromatography/mass spectrometry (GC-MS), scanning electron microscopy (SEM) and staged sampling particulate system methods. The variations of oxidation susceptibility, soluble organic fraction (SOF) components, size distribution and microstructure of particulate with and without FBC were studied. Results showed that the oxidation reaction of particulate matter (PM) was moved to the low temperature area with the increase of FBC ratio, and the mass fraction of 150 mg/kg for Ce was the optimal blending ratio. The ignition temperatures of PM combustion were reduced by 94, 131, 150 and 152, and the peak temperatures were reduced by 61, 123, 146 and 161 with the four FBC fuels. Before and after adding FBC, the mass fraction of SOF in PM sample were 29.6% and 24.1%, respectively. Compared with pure diesel PM sample, the high number of carbon atoms in SOF was decreased, and the polycyclic aromatic hydrocarbons (PAHs) were decreased by 49.2%. For FBC particle sample the particle sizes were moved towards small size direction, the peak number concentration of accumulation modal particle was decreased by 14.4%, the peak number concentration of nuclear modal particle was increased by 8.9%, and the peak mass concentration was decreased by 14.5%. FBC particle sample, which had porous sponge morphology and low bonding degree, contained 1.23% of Ce element. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Cerium
Controlled terms: Air filters - Aromatic hydrocarbons - Blending - Carbon - Catalysts - Chemical bonds - Chromatography - Combustion - Diesel engines - Engines - Filters (for fluids) - Fuel filters - Fuels - Gas chromatography - Ignition - Metals - Microstructure - Polycyclic aromatic hydrocarbons - Scanning electron microscopy - Temperature
Uncontrolled terms: Diesel particulate filters - Fuel-borne catalysts - Gas chromatography/Mass spectrometry - Number of carbon atoms - Optimal blending ratio - Physicochemical property - Polycyclic aromatic hydrocarbons (PAHS) - Soluble organic fraction
Classification code: 451.2 Air Pollution Control
Air Pollution Control
- 521.1 Fuel Combustion
Fuel Combustion
- 547.2 Rare Earth Metals
Rare Earth Metals
- 612.2 Diesel Engines
Diesel Engines
- 641.1 Thermodynamics
Thermodynamics
- 801.4 Physical Chemistry
Physical Chemistry
- 802.3 Chemical Operations
Chemical Operations
- 804 Chemical Products Generally
Chemical Products Generally
- 804.1 Organic Compounds
Organic Compounds
- 951 Materials Science
Materials Science
Numerical data indexing: Percentage 1.23e+00%, Percentage 1.44e+01%, Percentage 1.45e+01%, Percentage 2.41e+01%, Percentage 2.96e+01%, Percentage 4.92e+01%, Percentage 8.90e+00%
DOI: 10.6041/j.issn.1000-1298.2017.02.046
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
28. Automatic Navigation System of Tractor Based on DGPS and Double Closed-loop Steering Control
Accession number: 20172103687834
Authors: Li, Yongjian (1); Zhao, Zuoxi (2); Huang, Peikui (2); Guan, Wei (1); Wu, Xiaopeng (2)
Author affiliation: (1) Department of Mechanical and Electrical Engineering, Guangdong AIB Polytechnic College, Guangzhou; 510507, China; (2) Key Laboratory of Key Technology on Agricultural Machine and Equipment, Ministry of Education, South China Agricultural University, Guangzhou; 510642, China
Corresponding author: Zhao, Zuoxi(zhao_zuoxi@hotmail.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 11-19
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: An agricultural automatic navigation system was designed on Dongfanghong X-804 tractor to improve the navigation control of agricultural machinery by using RTK-DGPS and double closed-loop steering control. The make-up of the whole navigation system and working principle were presented, among which their main features were: RTK-DGPS could offer positioning data, including heading, roll and pitch parameters, which were acquired from AHRS500GA, and the electro-hydraulic steering controller was developed for automatic steering control. Then, the system control strategy was analyzed and the control transfer function model was developed for trajectory tracking, with a double closed-loop control algorithm for steering system designed according to characteristic of the system nonlinear. The implementation description on an ARM9E-based embedded control system was provided in terms of electronics hardware design. Tests were conducted to examine the navigation system, including a straight line driving test on uneven road, which was to verify the effectiveness of the correction model. The test results showed that the proposed positioning and orientation evaluation algorithm could eliminate the effects of uneven field condition on GPS positioning and the average error of GPS positioning was reduced to 0.43°. Then a test of steering control system was carried out to verify the performance of double closed-loop control algorithm. Test results showed that the steering control system solved the control overshoot well and the average error was 0.40°. Finally, the field test results showed that the performance of automatic navigation system was improved, with average route tacking error was less than 0.019 m, average steering angle tracking error was 0.43° and standard deviation was less than 0.041 m. The field test results indicated that the proposed positioning evaluation algorithm and double closed-loop steering control algorithm on uneven field were appropriated to Dongfanghong X-804 tractor. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Closed loop control systems
Controlled terms: Agricultural machinery - Agriculture - Automobile testing - Control systems - Errors - Global positioning system - Hydraulic machinery - Navigation systems - Tractors (agricultural) - Tractors (truck)
Uncontrolled terms: Automatic navigation - Differential global positioning systems - Double closed-loop control - Steering systems - Tracking errors
Classification code: 632.2 Hydraulic Equipment and Machinery
Hydraulic Equipment and Machinery
- 662 Automobiles and Smaller Vehicles
Automobiles and Smaller Vehicles
- 663.1 Heavy Duty Motor Vehicles
Heavy Duty Motor Vehicles
- 731.1 Control Systems
Control Systems
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 821.1 Agricultural Machinery and Equipment
Agricultural Machinery and Equipment
Numerical data indexing: Size 1.90e-02m, Size 4.10e-02m
DOI: 10.6041/j.issn.1000-1298.2017.02.002
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
29. Dynamic Parameter Identification for Robot Manipulators with Nonlinear Friction Model
Accession number: 20172103687701
Authors: Xi, Wanqiang (1); Chen, Bai (1); Ding, Li (1); Wu, Hongtao (1); Xie, Benhua (1)
Author affiliation: (1) College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing; 210016, China
Corresponding author: Chen, Bai(chenbye@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 393-399
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the dynamical parameter identification for robot manipulator, the artificial bee colony algorithm for identification was proposed. Considering the friction characteristics that the friction model was unable to reappear the behavior of complex dynamic friction at low speeds, the nonlinear robot model contained the nonlinear friction model was deduced by introducing the nonlinear Daemi-Heimann model. Then, the five order Fourier series was designed as exciting trajectory to collect experimental data, which satisfied velocity and acceleration boundary conditions. With the artificial bee colony algorithm, the colony bee was employed as search unit to identify unknown parameters which included 15 minimum inertia parameters and 12 friction parameters in the model through exchanging the information and retaining the superior individual. Finally, the established model was validated and analyzed, and all the results demonstrated that the proposed identification algorithm can accurately identify the dynamical parameters, and it also had high-speed convergence, strong search capability and can achieve the accurate prediction of robot driving torque. Compared with the linear dynamic model, the established nonlinear dynamical model can effectively improve the condition of sudden change about friction torque at the moment of joints commutation and can well reflect the dynamical characteristics of robot. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 19
Main heading: Parameter estimation
Controlled terms: Evolutionary algorithms - Flexible manipulators - Fourier series - Friction - Identification (control systems) - Industrial robots - Manipulators - Modular robots - Optimization - Robot applications - Robots - Tribology
Uncontrolled terms: Acceleration boundaries - Artificial bee colony algorithms - Dynamical characteristics - Friction characteristics - High-speed convergence - Identification algorithms - Nonlinear dynamical models - Nonlinear friction
Classification code: 731 Automatic Control Principles and Applications
Automatic Control Principles and Applications
- 921.3 Mathematical Transformations
Mathematical Transformations
- 921.5 Optimization Techniques
Optimization Techniques
- 931 Classical Physics; Quantum Theory; Relativity
Classical Physics; Quantum Theory; Relativity
DOI: 10.6041/j.issn.1000-1298.2017.02.053
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
30. Chlorophyll Fluorescence Spectra Analysis of Early Rice Blast
Accession number: 20172103687859
Authors: Zhou, Li’na (1, 2); Cheng, Shuchao (2); Yu, Haiye (1); Zhang, Lei (1)
Author affiliation: (1) Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun; 130025, China; (2) College of Engineering and Technology, Jilin Agricultural University, Changchun; 130118, China
Corresponding author: Yu, Haiye(haiye@jlu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 203-207
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to detect rice blast rapidly and accurately, chlorophyll fluorescence spectra of early rice blast were analyzed on leaf level, and the identification models of rice blast were established. Rice leaves were inoculated with rice pear spore first, and chlorophyll fluorescence spectra were achieved respectively at three stages of inoculation before (0 h), gley period (48 h) and disease spots early appearance (7 d). Meanwhile, variation characteristics of chlorophyll fluorescence spectra at three stages were analyzed, Savitzky-Golay (SG) and the first derivative transform (FDT) were applied to reduce the noises and obtain the characteristics of chlorophyll fluorescence spectra. Then the method of Gaussian function fitting (GFF) was used to achieve the dimension reduction on spectral information, and multiple feature vectors of each band were extracted. Furthermore, the spectral data were divided into calibration set and validation set. Taking three stages of early disease as rice blast levels, and comparing four classic kernel function, support vector classification (SVC) models were established respectively with full bands feature vectors and composite bands feature vectors based on calibration set, and the models were tested with validation set. The results indicated that chlorophyll fluorescence spectra of blue green region, red and far-red region were changed with the change of severity of early disease, GFF-SVC model with SG-FDT pretreatment for three stages disease had the highest classification accuracy rate, and the recognition results of different bands combination of primary spectrum, SG spectrum, SG-FDT spectrum were different for rice blast. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 19
Main heading: Chlorophyll
Controlled terms: Calibration - Fluorescence - Static Var compensators - Vectors
Uncontrolled terms: Chlorophyll fluorescence - Classification accuracy - Gaussian functions - Identification model - Rice blasts - Spectral information - Support vector classification - Variation characteristics
Classification code: 704.2 Electric Equipment
Electric Equipment
- 741.1 Light/Optics
Light/Optics
- 804.1 Organic Compounds
Organic Compounds
- 921.1 Algebra
Algebra
Numerical data indexing: Time 0.00e+00s, Time 1.73e+05s
DOI: 10.6041/j.issn.1000-1298.2017.02.027
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
31. Modeling and Simulation of Dynamic Behavior of Large Spray Boom with Active and Passive Pendulum Suspension
Accession number: 20172103687843
Authors: Cui, Longfei (1, 2); Xue, Xinyu (1); Ding, Suming (1); Gu, Wei (1); Chen, Chen (1); Le, Feixiang (1)
Author affiliation: (1) Nanjing Research Institute for Agricultural Mechanization, Ministry of Agriculture, Nanjing; 210014, China; (2) Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang; 212013, China
Corresponding author: Xue, Xinyu(735178312@qq.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 82-90
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: When sprayer works in the field, boom movement seriously affected the spray distribution, suspension system is the key device to control the dynamic behavior of boom. The response of a boom suspension should be such that it isolates the boom from high frequency roll of vehicle as it travels over bumpy ground, while transmitting low frequency roll so that the boom can follow undulating and sloping ground. In order to solve the dynamics and control problems of double pendulum active and passive suspension mechanism, considering the coupling effect of vehicle body motion, change of terrain slope, friction of moving pair, etc., a higher order differential equation group was established to describe the dynamic behavior of boom by using the second kinds of Lagrange dynamics equation. Based on this, the dynamic characteristics of the passive suspension were studied, and the effects of these factors, such as damping, friction and pendulum length on the response characteristics were analyzed. A Matlab/Simulink simulation model of active suspension based on hydraulic proportional control was established, and then the influence of gain coefficient, time constant and suspension structure parameters on the boom response and tracking error was revealed. By using Stewart six degree of freedom motion simulation platform and dynamic testing system, step response test and frequency response test were conducted on a spray boom with pendulum suspension, the root mean square error between frequency response test value and the mathematical model predictive value was 0.087. It was demonstrated that the model could be used in the design of a suspension to give a specified response to the rolling motion of the spray vehicle, and the results showed that the model can be used to predict the dynamic response characteristics of the boom, and guide the design of large boom suspension. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Suspensions (components)
Controlled terms: Automobile suspensions - Degrees of freedom (mechanics) - Differential equations - Dynamic analysis - Experiments - Frequency response - Friction - Magnetic levitation vehicles - MATLAB - Mean square error - Pendulums - Suspensions (fluids) - Vehicles
Uncontrolled terms: Boom sprayer - Dynamic response characteristics - Frequency response tests - Higher-order differential equation - Lagrange dynamics equation - Matlab/Simulink simulation - Response characteristic - Simulation
Classification code: 601.2 Machine Components
Machine Components
- 662.4 Automobile and Smaller Vehicle Components
Automobile and Smaller Vehicle Components
- 804 Chemical Products Generally
Chemical Products Generally
- 901.3 Engineering Research
Engineering Research
- 921 Mathematics
Mathematics
- 921.2 Calculus
Calculus
- 922.2 Mathematical Statistics
Mathematical Statistics
- 931.1 Mechanics
Mechanics
DOI: 10.6041/j.issn.1000-1298.2017.02.011
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
32. Design and Experiment of Ditching Blade Installed in Close Planting Orchard Ditching Machinery
Accession number: 20172103687841
Authors: Kang, Jianming (1, 2); Li, Shujun (3); Yang, Xuejun (1, 4); Liu, Lijing (1, 4); Wang, Changwei (4); Liu, Xiaoqiu (4)
Author affiliation: (1) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China; (2) Mechanical Equipment Research Institute, Xinjiang Academy of Agricultural and Reclamation Science, Shihezi; 832000, China; (3) China Machine Industry Corporation Co., Ltd., Beijing; 100080, China; (4) Modern Agricultural Equipment Co., Ltd., Beijing; 100083, China
Corresponding author: Li, Shujun(lisj@caams.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 68-74
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Ditching fertilization is one of the important links of fruit planting, which is done artificially with large labor intensity but low efficiency, failing to satisfy the requirement of high quality fertilization for modern orchard. The disc-type ditcher is a kind of continuous earth-moving machinery followed by the chain ditcher, which is characterized by high efficiency and convenient operation, and widely used in the farmland water construction and orchard ditching fertilization, etc. But the existing ditching blade has the problems of large power consumption and poor stability of ditch depth. A sine-exponential curve ditching blade was designed through analyzing the advantages and disadvantages of existing blade, using the rotary tillage theory and experimental analysis. Through the analysis of tractor forward speed, rotating speed of the cutter, as well as the influence of their interaction on power consumption and ditch depth stability, the optimal working parameters of the sine-exponential curve ditching blade were as following: tractor forward speed was 1 m/s, rotating speed of cutter was 200 r/min. The optimal structure parameters of the sine-exponential curve ditching blade were determined through the three-factor four-level orthogonal test with bending angle and bending radius in B and bending angle in C of the sine-exponential curve ditching blade as impact factors, and power consumption and groove depth stability as response value: bending angle in B was 95°, bending angle in C was 140°, and bending radius was 9 mm. Through comparing the sine-exponential curve ditching blade with existing blade, it was showed that under the same working parameters and ditching depth, the power consumption of the sine-exponential curve ditching blade was decreased by 3.29 kW and ditching depth stability was increased by 8.83 percentage points compared with the existing blade. Index of the technical specifications for the sine-exponential curve type ditching blade is higher than the national standard. The research results provided a theoretical basis for the sine-exponential curve type furrowing blade optimization design. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 18
Main heading: Curve fitting
Controlled terms: Efficiency - Electric power utilization - Energy efficiency - Farms - Machine design - Machinery - Orchards - Rotating machinery - Stability - Structural optimization - Tractors (truck)
Uncontrolled terms: Ditching blade - Experimental analysis - Exponential curves - Optimal structures - Optimization design - Technical specifications - Tractor forward speed - Working parameters
Classification code: 525.2 Energy Conservation
Energy Conservation
- 601 Mechanical Design
Mechanical Design
- 601.1 Mechanical Devices
Mechanical Devices
- 663.1 Heavy Duty Motor Vehicles
Heavy Duty Motor Vehicles
- 706.1 Electric Power Systems
Electric Power Systems
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 821.3 Agricultural Methods
Agricultural Methods
- 913.1 Production Engineering
Production Engineering
- 921.5 Optimization Techniques
Optimization Techniques
- 921.6 Numerical Methods
Numerical Methods
Numerical data indexing: Power 3.29e+03W, Rotational_Speed 2.00e+02RPM, Size 9.00e-03m, Velocity 1.00e+00m/s
DOI: 10.6041/j.issn.1000-1298.2017.02.009
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
33. Characteristics of Airborne 2D Electro-hydraulic Servo Flow Valve
Accession number: 20172103687702
Authors: Zuo, Xiqing (1, 2); Liu, Guowen (2); Jiang, Haibin (3); Ruan, Jian (1); Zhao, Jiantao (1); Zhu, Zhaoliang (1)
Author affiliation: (1) Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education, Zhejiang University of Technology, Hangzhou; 310014, China; (2) Department of Mechanical and Electrical Engineering, Huzhou Vocational & Technical College, Huzhou; 313000, China; (3) College of Mechanical Engineering, Quzhou University, Quzhou; 324000, China
Corresponding author: Ruan, Jian(wxmin@mail.hz.zj.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 400-406 and 399
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: With the widespread application of servo system in major equipment of industrial, military, aerospace and other important areas, there is a great demand for the electro-hydraulic servo flow valve which can response fast under the condition of high pressure and high flow. So the novel design project plan of 2D (two-dimensional) electro-hydraulic servo flow valve was made. The angular displacement of the proportional rotary electromagnet was detected by HALL sensor in this project, and compared with the input control signal to realize closed-feedback of angular displacement’s signal. Variable transmission ratio lever-fork structure was adopted. In order to enhance the valve’s control precision and anti-pollution capability, the rotary electromagnet angular displacement was proportionally converted into spool axial displacement by 2D technology which realized a closed-feedback of the chute sensitive channel. The mathematical model of the valve was established, and the simulation analysis was carried out on the whole system. Based on the analysis of the valve’s mathematical model and system parameters, sample equipment was manufactured and the experimental study was carried out. When the system pressure was 35 MPa and the spool displacement was 0.8 mm, the valve’s bandwidth was about 120 Hz, dynamic response time was about 5 ms, and the flow rate of 6 mm spool diameter was 60 L/min. The valve had a small and simple bodies, its weight was only one third of the same level valves. It also had low power consumption, and easy to realize closed-loop control, its static and dynamic performance was superior; therefore, the research result showed that it worked very well for airborne hydraulic system. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 13
Main heading: Feedback
Controlled terms: Electromagnets - Hall effect transducers - Hydraulic equipment - Hydraulic machinery - Pollution control - Reels
Uncontrolled terms: Angular displacement - Dynamic characteristics - Electrohydraulic servos - Flow valves - Lever-fork - Low-power consumption - Static and dynamic performance - Variable transmission ratio
Classification code: 632.2 Hydraulic Equipment and Machinery
Hydraulic Equipment and Machinery
- 691.2 Materials Handling Methods
Materials Handling Methods
- 704.1 Electric Components
Electric Components
- 731.1 Control Systems
Control Systems
Numerical data indexing: Frequency 1.20e+02Hz, Pressure 3.50e+07Pa, Size 6.00e-03m, Size 8.00e-04m, Time 5.00e-03s
DOI: 10.6041/j.issn.1000-1298.2017.02.054
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
34. Numerical Simulation and Experiment of Pressure Fluctuation in Mixed-flow Pumps under Low Flow Conditions
Accession number: 20172103687848
Authors: Zhang, Desheng (1); Liu, Junlong (1); Geng, Linlin (1); Shi, Lei (1); Zhang, Junjie (1)
Author affiliation: (1) Technical and Research Center of Fluid Machinery Engineering, Jiangsu University, Zhenjiang; 212013, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 117-125
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The pressure fluctuation experiment was conducted and the entire flow field of mixed-flow pump was simulated by large eddy simulation (LES) with standard Smagorinsky subgrid scale model to investigate pressure fluctuations and mixed-flow pump inner flow under low flow conditions. The experimental results indicated that the multiples of pressure fluctuation at the impeller inlet was the highest and it was increased when the flow rate was decreased. the main pressure fluctuation frequencies at the impeller inlet, impeller outlet and vanes inlet were blades passing frequency under different conditions, however, the main pressure fluctuation frequencies at the vanes outlet was changed under different conditions. The large eddy simulation results indicated that the flow conditions at impeller inlet was better and axial velocity was changed small under 0.8Qopt(Qopt, operating condition). Under 0.4Qopt, however, the flow conditions at impeller inlet became complicated, therefore, the axial velocity was changed significantly. The angle of attack of the fluid on the blades was increased and affected by tip leakage flow. The flow separation was generated at the leading edge of suction surface at t*=0.041 6, when the impeller was rotated from t*=0.041 6 to t*=0.124 9, the flow separation was intensified and the swirling strength of the separation vortex was gradually increased, so the static pressure of the leading edge of suction surface was decreased, the adverse pressure gradient was increased which promoted the generation of backflow. When the backflow reached the leading edge, the static pressure of leading edge was gradually restored, therefore the flow separation was an important reason that making the multiples of pressure fluctuation increased. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 20
Main heading: Large eddy simulation
Controlled terms: Angle of attack - Computational fluid dynamics - Computer simulation - Flow separation - Impellers - Leakage (fluid) - Numerical models - Pumps
Uncontrolled terms: Adverse pressure gradient - Low flow condition - Mixed flow pump - Operating condition - Pressure fluctuation - Pressure pulsation - Separation vortex - Smagorinsky subgrid scale model
Classification code: 601.2 Machine Components
Machine Components
- 618.2 Pumps
Pumps
- 631 Fluid Flow
Fluid Flow
- 651.1 Aerodynamics, General
Aerodynamics, General
- 723.5 Computer Applications
Computer Applications
- 921 Mathematics
Mathematics
DOI: 10.6041/j.issn.1000-1298.2017.02.016
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
35. Dynamic Calibration Method for Time Temperature Indicator Towards Quality of Agricultural Produce under Cold Chain
Accession number: 20172103687874
Authors: Zhang, Hu (1); Zhang, Xiaoshuan (1, 2); Sun, Gege (1); Fu, Zetian (1, 2); Ma, Changyang (3)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Food Quality and Safety Laboratory in Beijing, China Agricultural University, Beijing; 100083, China; (3) Pharmaceutical College, Henan University, Kaifeng; 475004, China
Corresponding author: Ma, Changyang(macaya1024@sina.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 314-321
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Time temperature indicator (TTI) is an intelligent tool to monitor and record directly the time-temperature history of cold chain and indicate quality of corresponding agriculture produce. Because of the restriction of classic matching condition, TTI has not been widely used in a wide variety of agricultural produces. Even when the TTI satisfies the conditions, the reliability of application is significantly affected by the unstable primary quality of agricultural produces. The application of TTI is expanded through adjusting its parameters, and determining the requirements for matching with agricultural produces and the calibration procedure of TTI. The result deduced through the reaction kinetics equations and contour diagram indicated that the only matching condition was activation energy of TTI should equal to the parameter of agricultural produce, or there existed a proportional relationship between the contour lines of the two products. Besides, an adjusting process of TTI should be used with the new matching condition together. Considering a change of the state of TTI and agricultural produces, the calibration process was divided into two parts: first was the static model with the two produces’ state which were static, and the second was the dynamic model with both of the two produces were in constant change. It provided corresponding theory and methods by using the Arrhenius equations and contour diagram for the two calibration process respectively. These calibration methods can expand the application of TTI and improve the precision and reliability of monitoring the quality of agricultural produces. Finally, the validity and reliability of the calibration theory were illustrated with an example by using two types of enzymatic TTIs, two types of chemical TTIs and Muscat grape. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 16
Main heading: Agriculture
Controlled terms: Activation energy - Calibration - Chains - Image quality - Reaction kinetics - Reliability - Reliability theory - Temperature measuring instruments
Uncontrolled terms: Agricultural produce - Calibration procedure - Calibration process - Cold chain - Dynamic calibration method - Proportional relationships - Time-temperature history - Time-temperature indicators
Classification code: 602.1 Mechanical Drives
Mechanical Drives
- 802.2 Chemical Reactions
Chemical Reactions
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 922.2 Mathematical Statistics
Mathematical Statistics
- 944.5 Temperature Measuring Instruments
Temperature Measuring Instruments
DOI: 10.6041/j.issn.1000-1298.2017.02.042
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
36. Dynamic Simulation and Experiments on Artemisia selengensis Orderly Harvester Cutter
Accession number: 20172103687847
Authors: Shi, Yinyan (1); Chen, Man (2); Wang, Xiaochan (1, 3); Zhang, Yongnian (1); Odhiambo, Morice Oluoch (1)
Author affiliation: (1) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China; (2) Nanjing Research Institute for Agricultural Mechanication, Ministry of Agriculture, Nanjing; 210014, China; (3) Jiangsu Province Engineering Laboratory for Modern Facilities Agricultural Technology and Equipment, Nanjing; 210031, China
Corresponding author: Wang, Xiaochan(wangxiaochan@njau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 110-116
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: As one of the most important working components of harvester, the cutting performance of cutter directly affects the quality of crops harvest and the subsequent transportation effectiveness. The reciprocating cutter structural parameters of the self-designed Artemisia selengensis orderly harvester and the physical parameters of Artemisia selengensis were studied, the three-dimensional entity model of cutter and flexible simplified model of crop stem were built by software Pro/E, and the coupled dynamics simulation analysis was proceeded through dynamic analysis software ADAMS according to the parameters acquired. The cutting speed vg, cutting angle α and working speed vmof the cutting system were selected as factors, the cutting force F and recutting ratio γ were selected as evaluating indicators to design a virtual orthogonal experiment with three factors and three levels. The response surface methodology (RSM) regression analysis and variance analysis were applied to analyze the results, and compared with the test results of field experiment. The results showed that RSM optimum combination was vg=1.6 m/s, α=15°, vm=1.0 m/s, cutting force F and recutting ratio γ were effectively reduced with this combination, the comparison results showed that the cutting force error was less than 10.9% and the recutting ratio error was 11.3%, indicating the effectiveness of the simulation analysis and regression forecasting model. The study illustrated that the reciprocating cutter designed could satisfy the demands of Artemisia selengensis orderly harvest, and had a certain reference value. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 22
Main heading: Computer software
Controlled terms: Computer simulation - Crops - Cutting - Harvesters - Harvesting - Regression analysis - Virtual prototyping
Uncontrolled terms: Artemisia selengensis - Evaluating indicators - Orthogonal experiment - Reciprocating cutter - Regression forecasting model - Response surface methodology - Structural parameter - Three-dimensional entity models
Classification code: 723 Computer Software, Data Handling and Applications
Computer Software, Data Handling and Applications
- 723.5 Computer Applications
Computer Applications
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 922.2 Mathematical Statistics
Mathematical Statistics
Numerical data indexing: Percentage 1.09e+01%, Percentage 1.13e+01%
DOI: 10.6041/j.issn.1000-1298.2017.02.015
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
37. Nitrogen and Phosphorus Removal Effect of Decentralized Sewage Treatment Using Biofilm Technology with Integration of Local Circulating and Oxygen-supply
Accession number: 20172103687871
Authors: Zhao, Qiu (1, 2); Wu, Di (2); Qian, Shan (2); Gao, Xianbiao (2); Sun, Xiangyang (1)
Author affiliation: (1) College of Forestry, Beijing Forestry University, Beijing; 100083, China; (2) Tianjin Institute of Agricultural Resources and Environment, Tianjin; 300192, China
Corresponding author: Wu, Di(wudi_1008@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 294-299
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Simultaneous nitrogen and phosphorus removal performance of a kind of biomembrane process integrated with partial circulatory aeration and two-stage treated water returning alternately was studied by utilizing the technology to treat typical decentralized wastewater from Modern Agricultural Science and Technology Innovation Base in Tianjin. The system with a total effective volume of 234 m3was composed of collecting tank, hydrolysis acidification balance tank, partial aerobic tank, secondary sedimentation tank and circulation tank. Sewage pumps in collecting tank were controlled by PLC automatic control system. Sludge pumps in secondary sedimentation tank worked 10 min every 2 h controlled by PLC automatic control system. Circulating water pumps in circulation tank controlled by PLC automatic control system could maintain necessary water flowing when inflowing and sludge returning were simultaneously stopped. The nominal air delivery of clover roots blowers in equipment room was 2.0 m3/h. Hydrolysis acidification balance tank and partial aerobic tank were both filled with combined bio-carrier at a filling height of 2 m and the filling percentage and hydraulic load of the two tanks were 60%, 1.25 m3/(m3•d) and 70%, 2.0 m3/(m3•d), respectively. The operation of the whole system was controlled by PLC. Pumps for inflow worked intermittently and total time of it’s working was 6 h every day. Aeration was continuous and partial. Since June, 2013, the test running was completed, the system was always operating formally in the way of intermittent inflow, partial aeration and alternate wastewate return. The raw decentralized wastewater was discharged from office buiding, research activities building, expert floor, restaurant, guest house and industry incubator and except for those from restaurants and toilets, which were firstly discharged into oil separation tank and septic tank for pre-treating, the most was discharged directly into the system to treat. The designed treating capacity of this system was 150 m3/d and the maximum influent quantity, minimum influent quantity and average influent quantity in reality was 140 m3/d, 80 m3/d and 100 m3/d, respectively. The return ratio was controlled at 2:1 by PLC. Through long tem operation of two years, the results showed that the average removal percentages for BOD5, NH3-N, TN and TP were 71.6%, 64.4%, 45.5% and 72.0%, respectively, and the average effluent concentrations of BOD5, NH3-N, TN and TP were 15.3 mg/L, 9.2 mg/L, 17.2 mg/L and 0.8 mg/L, respectively. It was indicated that the quality of treated effluent was up to “Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant” level 1B and treated water can be used as irrigation water. Nitrogen and phosphorus removal function was also well established when treating decentralized wastewater with high fluctuation and high loading. And it was further observed that removal percentages for BOD5, NH3-N and TP were increased with the increase of BOD5/TN and removal percentage for TN was decreased with the increase of BOD5/TN and BOD5/TP, while TN/TP was not one of main contributors to affecting removal percentage of BOD5, NH3-N, TN and TP. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Water treatment
Controlled terms: Acidification - Automation - Biofilms - Control systems - Effluent treatment - Effluents - Hydraulic machinery - Hydrolysis - Irrigation - Nitrogen - Nitrogen removal - Oxygen supply - Phosphorus - Process control - Pumps - Septic tanks - Settling tanks - Sewage treatment - Tanks (containers) - Wastewater treatment - Water pollution
Uncontrolled terms: Agricultural science and technology innovations - Decentralized wastewater - Hydrolysis acidification - Municipal wastewater treatment plants - Nitrogen and phosphorus removal - Secondary sedimentation tanks - Simultaneous nitrogen and phosphorus removals - Two-stage alternate return
Classification code: 445.1 Water Treatment Techniques
Water Treatment Techniques
- 452 Municipal and Industrial Wastes; Waste Treatment and Disposal
Municipal and Industrial Wastes; Waste Treatment and Disposal
- 453 Water Pollution
Water Pollution
- 462.5 Biomaterials (including synthetics)
Biomaterials (including synthetics)
- 618.2 Pumps
Pumps
- 619.2 Tanks
Tanks
- 632.2 Hydraulic Equipment and Machinery
Hydraulic Equipment and Machinery
- 731 Automatic Control Principles and Applications
Automatic Control Principles and Applications
- 731.1 Control Systems
Control Systems
- 802.2 Chemical Reactions
Chemical Reactions
- 804 Chemical Products Generally
Chemical Products Generally
- 821.3 Agricultural Methods
Agricultural Methods
- 822.2 Food Processing Operations
Food Processing Operations
Numerical data indexing: Mass_Density 1.53e-02kg/m3, Mass_Density 1.72e-02kg/m3, Mass_Density 8.00e-04kg/m3, Mass_Density 9.20e-03kg/m3, Percentage 4.55e+01%, Percentage 6.00e+01%, Percentage 6.44e+01%, Percentage 7.00e+01%, Percentage 7.16e+01%, Percentage 7.20e+01%, Size 2.00e+00m, Time 2.16e+04s, Time 6.00e+02s, Time 7.20e+03s, Volume 2.34e+02m3
DOI: 10.6041/j.issn.1000-1298.2017.02.039
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
38. Evaluation Method of Agricultural Machinery Professional Chassis’ Cases Based on Multiple Attributes Decision
Accession number: 20172103687882
Authors: Zhao, Xiuyan (1); Song, Zhenghe (2); Zhang, Kaixing (3, 4); Liu, Xianxi (3)
Author affiliation: (1) College of Information Science and Engineering, Shandong Agricultural University, Taian; 271018, China; (2) College of Engineering, China Agricultural University, Beijing; 100083, China; (3) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Taian; 271018, China; (4) Shandong Provincial Key Laboratory of Horticultural Machineries and Equipments, Taian; 271018, China
Corresponding author: Liu, Xianxi(wjbliu@sdau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 370-377
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Agricultural machinery professional chassis has many types of parameters and their difference between each other is so large that they cannot be fully compensated without any price. For these characteristics, the classical nearest neighbor algorithm which relies on weight properties in case-based reasoning is unacceptable in practice. Aiming at the situation above, the sorted method ELECTRE, belonging to multiple attribute decision, which was characterized by outranking relationship, was applied to the similarity assessment. In this algorithm, the first step was data preprocessing; then AHP was adopted to determine attributes’ weights; after that harmony and disharmony thresholds were obtained by constantly experimenting adjustment; and then construction and mining of relationships were carried out; the ultimate goal was to accomplish similarity assessment between design case and database cases. After that, crawler of walking system and chassis prototype were used for verification of the algorithm. Compared with the nearest neighbor method, the algorithm not only returned the former models which had higher overall similarity, but also marked the key parameters that affected the order, allowing users to have more follow-up evaluation. To make the algorithm to be more practical, a prototype interface of CBR was developed and the input of critical parameters and output of results were demonstrated. The overall result was good. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 19
Main heading: Case based reasoning
Controlled terms: Agricultural machinery - Agriculture - Chassis - Parameter estimation - Professional aspects
Uncontrolled terms: Data preprocessing - Electre methods - Multiple attributes - Nearest neighbor algorithm - Nearest neighbor method - Prototype interface - Similarity assessment - Weight Properties
Classification code: 662.4 Automobile and Smaller Vehicle Components
Automobile and Smaller Vehicle Components
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 821.1 Agricultural Machinery and Equipment
Agricultural Machinery and Equipment
- 901.1 Engineering Professional Aspects
Engineering Professional Aspects
DOI: 10.6041/j.issn.1000-1298.2017.02.050
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
39. Growth and Water Use Efficiency of Water-saving Type Pruning Jujube Tree in Dry Soil
Accession number: 20172103687865
Authors: Wang, Youke (1, 2); Hui, Qian (1); Wang, Xing (2); Ma, Jianpeng (2); Zhang, Wenfei (2)
Author affiliation: (1) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling; Shaanxi; 712100, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 247-254
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: For a long time, the soil of artificial forest land in the loess hilly-gully region was continued to be dry, which had serious impact on the subsequent vegetation. Studying on jujube growth in the dry soil had important significance to realize forestry sustainable development in this region. Four different initial soil volumetric water content levels were set for the experiment in the open air, and the same water-saving type pruning was used to keep consistent specifications. Soil moisture, jujube growth and yield for two consecutive years were tested under a completely natural rainfall condition. Results showed that the soil moisture was tended to be a fixed value for different initial soil moisture contents under natural rainfall. And this value was depended on rainfall. Normal precipitation year soil moisture was steady at (13.83±0.22)% in 2014, partial drought year soil moisture was steady at (9.46±0.32)% in 2015. Different initial soil drying degrees would significantly inhibit the growth of branches and jujube fruit number. Jujube growth under the same dry soil was depended on rainfall. The yield under water-saving type pruning technology was 36%~41% higher than that of conventional dwarf pruning, water use efficiency was increased by more than 3.6 times. Water-saving pruning techniques would improve jujube water use efficiency. This research can solve dry jujube soil water shortage in the loess hilly-gully region and provide new basis for achieving sustainable development. This research had the important theoretical significance and value in practice. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 37
Main heading: Soils
Controlled terms: Efficiency - Forestry - Landforms - Moisture - Planning - Rain - Sediments - Soil moisture - Sustainable development - Water conservation - Water supply
Uncontrolled terms: Initial soil moisture - Jujube tree - Loess hilly gully region - Natural rainfalls - Pruning - Pruning techniques - Rainfed - Water use efficiency
Classification code: 443.3 Precipitation
Precipitation
- 444 Water Resources
Water Resources
- 446.1 Water Supply Systems
Water Supply Systems
- 481.1 Geology
Geology
- 483 Soil Mechanics and Foundations
Soil Mechanics and Foundations
- 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 912.2 Management
Management
- 913.1 Production Engineering
Production Engineering
DOI: 10.6041/j.issn.1000-1298.2017.02.033
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
40. Progress in Research on Regional Ecological Security Pattern Optimization
Accession number: 20172103687833
Authors: Yue, Depeng (1); Yu, Qiang (1); Zhang, Qibin (1); Su, Kai (1); Huang, Yuan (1); Ma, Huan (1)
Author affiliation: (1) Beijing Key Laboratory of Precision Forestry, Beijing Forestry University, Beijing; 100083, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 1-10
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Optimization of regional ecological security pattern is the basis of regional ecological security. It is of great significance to analyze and optimize the regional ecological security pattern by using proper models and methods. The optimization of regional ecological security pattern requires the integration of multi-disciplinary synthesis, multi-perspective analysis and the combination of various means. It is generally based on the understanding of the relationship between different landscape types, landscape spatial pattern, landscape process and function. Typically, the impact ways of landscape pattern on the process are found first. Then, a mathematical model is built based on the principles of landscape ecology to optimize land use and local ecological security pattern from multi-level, multi-perspective and multi-disciplinary views. Based on the analysis of domestic and foreign research progress, a summary of the concept development, the evolution of the research content and the optimization methods of regional ecological security pattern was made. And the future research trend of regional ecological security pattern was obtained, including organic integration of multi model, multi method and multi technology, quantitative exploration of regional ecological security standards, public participation mechanism and management methods of interest coordination. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 71
Main heading: Ecology
Controlled terms: Integration - Land use
Uncontrolled terms: Concept development - Ecological security - Landscape pattern - Management method - Model integration - Optimization method - Pattern optimization - Public participation
Classification code: 403 Urban and Regional Planning and Development
Urban and Regional Planning and Development
- 454.3 Ecology and Ecosystems
Ecology and Ecosystems
- 921.2 Calculus
Calculus
DOI: 10.6041/j.issn.1000-1298.2017.02.001
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
41. Extraction Method of Navigation Baseline of Corn Roots Based on Machine Vision
Accession number: 20172103687837
Authors: Song, Yu (1); Liu, Yongbo (1); Liu, Lu (2); Zhu, Dequan (1); Jiao, Jun (1); Chen, Liqing (1)
Author affiliation: (1) School of Engineering, Anhui Agricultural University, Hefei; 230036, China; (2) School of Engineering Science, University of Science and Technology of China, Hefei; 230026, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 38-44
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to achieve small agricultural automated guided vehicle (AGV) which could navigate autonomously between corn rows, a method was proposed which could quickly and accurately extract the centerlines of middle-late corn rows as the innovative methods of navigation baseline of agricultural robot in field environment. The algorithm was improved by the traditional 2G-R-B algorithm so that it could obtain the characteristics of green plants in real-time and also improve the robustness of image pre-processing. According to the vertical projection of corn crop’s line, points of profile features of corn roots were generated. Using the detection algorithm of peak points, the backup location points of corn roots were obtained and then the location points of corn roots were got after the second judgment and detection. The least square method was used for fitting the location points of corn roots and two lines of crop rows were generated. The actual navigation baseline was calculated based on the formula angle bisector after the line slopes of two crop rows were generated respectively. In addition, the camera calibration process was simplified so that the image pixel coordinates could be converted into world coordinates quickly. The extracted angle and lateral deviation of navigation baselines were used as input parameters of navigation to control agriculture AGV. The experimental results showed that the method had strong robustness which could adapt to different environments and the accuracy of navigation baselines by detecting was more than 90%. The average processing time of a 700 pixels × 350 pixels color image was less than 185 ms which had a better real-time. The results provided a reliable reference method for autonomous navigation of the agricultural AGV in middle-late corn field. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 19
Main heading: Visual servoing
Controlled terms: Agricultural machinery - Agriculture - Automatic guided vehicles - Computer vision - Crops - Image processing - Least squares approximations - Location - Navigation - Pixels - Robots - Transportation
Uncontrolled terms: Agricultural AGV - Automated guided vehicles - Autonomous navigation - Corn root - Detection algorithm - Image preprocessing - Least square methods - Vertical projection
Classification code: 723.5 Computer Applications
Computer Applications
- 731.5 Robotics
Robotics
- 731.6 Robot Applications
Robot Applications
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 921.6 Numerical Methods
Numerical Methods
Numerical data indexing: Percentage 9.00e+01%, Time 1.85e-01s
DOI: 10.6041/j.issn.1000-1298.2017.02.005
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
42. Effects of Different Nitrogen Supply and Irrigation Methods on Spatial-temporal Distribution of Soil Nitrate Nitrogen during Maize Growth
Accession number: 20172103687869
Authors: Qi, Dongliang (1); Hu, Tiantian (1, 2)
Author affiliation: (1) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling; Shaanxi; 712100, China
Corresponding author: Hu, Tiantian(hutiant@nwsuaf.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 279-287
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A field experiment was conducted to investigate the effect of varying supply methods of nitrogen and irrigation on dynamics and distribution of soil nitrate nitrogen during maize (Zay mays L., cv. Gold northwestern 22) growth in Northwest China. Irrigation methods included alternate furrow irrigation (AI), fixed furrow irrigation (FI) and conventional furrow irrigation (CI). Nitrogen supply methods included alternate nitrogen supply (AN), fixed nitrogen supply (FN) and conventional nitrogen supply (CN), which were applied at each irrigation. Maize rows were established in west-east direction. Soil nitrate nitrogen content in south and north of the plant was measured in 0~100 cm soil depth (20 cm as an interval) before planting and at 6 collars, 12 collars, tasseling, filling and maturity stages. The results showed that spatial-temporal distribution of soil nitrate nitrogen in south and north of the plant was influenced more by varying methods of nitrogen supply and irrigation compared with that under the plant, so did that in 0~40 cm soil depth compared with that in 40~100 cm. At filling stage, soil nitrate nitrogen of irrigated side was moved down to 60~100 cm soil depth for FI coupled with FN when nitrogen and water were applied within the same furrow, and that of non-water supply side was gathered in 0~40 cm soil depth for FI coupled with FN when nitrogen and water were applied to different furrows. Compared with CI, AI reduced soil nitrate nitrogen under the plant in 40~80 cm soil depth by 9.9%~14.4% for different nitrogen supply methods. Compared with the other treatments, AI coupled with CN or AN maintained soil nitrate nitrogen in 0~40 cm soil depth for a longer time during maize growth. Soil residual nitrate nitrogen in 0~100 cm soil depth at harvest was comparable between AI coupled with CN and AI coupled with AN, and the residual of them was reduced by 11.7%~27.3% compared with those of the other treatments. Therefore, alternate furrow irrigation coupled with conventional or alternate nitrogen supply brought a relatively reasonable spatial-temporal distribution of soil nitrate nitrogen during maize growth, and lowered soil residual nitrate nitrogen at harvest. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Soil surveys
Controlled terms: Irrigation - Nitrates - Nitrogen - Soils - Spatial distribution - Water supply
Uncontrolled terms: Irrigation methods - Maize - Nitrate nitrogen - Nitrogen supply - Spatial-temporal distribution
Classification code: 446.1 Water Supply Systems
Water Supply Systems
- 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 804 Chemical Products Generally
Chemical Products Generally
- 804.2 Inorganic Compounds
Inorganic Compounds
- 821.3 Agricultural Methods
Agricultural Methods
- 921 Mathematics
Mathematics
Numerical data indexing: Size 0.00e+00m to 1.00e+00m, Size 0.00e+00m to 4.00e-01m, Size 2.00e-01m, Size 4.00e-01m to 1.00e+00m, Size 4.00e-01m to 8.00e-01m, Size 6.00e-01m to 1.00e+00m
DOI: 10.6041/j.issn.1000-1298.2017.02.037
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
43. Improved Method for 3D Reconstruction of Tree Model Based on Point Cloud Data
Accession number: 20172103687857
Authors: Tang, Liyu (1, 2); Zhang, Hao (1, 2); Huang, Hongyu (1, 2); Chen, Chongcheng (1, 2)
Author affiliation: (1) Key Laboratory of Spatial Data Mining and Information Sharing, Ministry of Education, Fuzhou University, Fuzhou; 350002, China; (2) National Engineering Research Centre of Geospatial Information Technology, Fuzhou University, Fuzhou; 350002, China
Corresponding author: Huang, Hongyu(hhy1@fzu.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 186-194
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Point cloud obtained from terrestrial laser scanner contains detailed, high precision three-dimensional (3D) surface coordinates, which is of special importance for forest parameter estimation and accurate reconstruction of plant model. An improved method for tree branching structure reconstruction was proposed based on the fact that a clean partition of branches and leaves form tree point cloud was very difficult if it was not impossible. Firstly, principal direction at each point was estimated with chord and normal vectors (CAN), and point cloud from the branches and leaves was separated by using both the similarity of principal direction between neighboring points and distribution density of points. Secondly, skeleton nodes and corresponding radii were computed from main branches by using level sets and least square method. For the leaves, the crown volume was divided into equal-sized voxels, all the points in a voxel were represented by the voxel’s centroid, and all centroid points formed feature points of the crown. Finally, tree model was reconstructed by cylinder fitting based on the topology of skeleton nodes and feature points. Segmentation results accuracy analysis and four different tree species model reconstruction examples were introduced. Segmentation accuracy analysis and model reconstruction quality evaluation showed that the approach was robust and insensitive to noise; the reconstructed tree models were in good agreement with the point cloud. The method was also able to extract structural parameters, including tree height, diameter at breast height (DBH) and volume parameters. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Three dimensional computer graphics
Controlled terms: Forestry - Image reconstruction - Image segmentation - Least squares approximations - Musculoskeletal system - Numerical methods - Plants (botany) - Quality control - Topology
Uncontrolled terms: 3D reconstruction - Laser point - Principal directions - Skeleton - Tree
Classification code: 461.3 Biomechanics, Bionics and Biomimetics
Biomechanics, Bionics and Biomimetics
- 723.2 Data Processing and Image Processing
Data Processing and Image Processing
- 913.3 Quality Assurance and Control
Quality Assurance and Control
- 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory
Combinatorial Mathematics, Includes Graph Theory, Set Theory
- 921.6 Numerical Methods
Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2017.02.025
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
44. Effects of Long-term Conservation Tillage on Nitrogen Accumulation and Translocation of Winter Wheat
Accession number: 20172103687864
Authors: Ding, Jinli (1, 2); Wu, Jicheng (3, 4); Yang, Yonghui (3, 4); Feng, Hao (1)
Author affiliation: (1) Institute of Soil and Water Conservation, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) College of Geography and Tourism, Zhengzhou Normal University, Zhengzhou; 450044, China; (3) Institute of Plant Nutrition and Resource & Environmental Science, Henan Academy of Agricultural Sciences, Zhengzhou; 450002, China; (4) Yuanyang Experimental Station of Crop Water Use, Ministry of Agriculture, Yuanyang; 453514, China
Corresponding author: Feng, Hao(nercwsi@vip.sina.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 240-246 and 341
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To study the effects of long-term conservation tillage (no-tillage and subsoiling) on nitrogen accumulation and translocation characteristics of winter wheat, a ten-year (2006-2016) field experiment was carried out, and the effects of different tillage treatments, including traditional tillage, no-tillage and subsoiling on the soil water content in 0~100 cm during the key winter wheat growth stages were analysed. The results showed that long-term no-tillage and subsoiling treatments significantly increased the soil water content in 0~100 cm and no-tillage treatment was superior to subsoiling treatment in the dry year. The nitrogen distribution ratio in stem and leaf was gradually decreased, while it was gradually increased in wheat are from flowering to harvesting stage under three tillage treatments. Compared with conventional tillage treatment, average nitrogen accumulation amounts in stem, leaf and ear under 2-year continuous no-tillage treatment were increased by 44.3%, 80.5% and 70.9%, respectively, and there was no significant increase under 2-year continuous subsoiling treatment at flowering stage. At harvesting stage, no-tillage and subsoiling treatments significantly decreased the nitrogen accumulation in stem, while significantly increased its ear accumulation amount compared with conventional tillage treatment. Moreover, no-tillage treatment significantly increased the nitrogen translocation amount of winter wheat vegetative organs, translocation ratio, contribution ratio to grain (P<0.05), while subsoiling treatment was non-sustainable to increase nitrogen translocation amount and ratio. In general, long-term effect of no-tillage treatment on nitrogen translocation of winter wheat was superior to that of subsoiling treatment, especially in the dry year. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 35
Main heading: Agricultural machinery
Controlled terms: Agriculture - Crops - Cultivation - Nitrogen - Soil conservation - Soil moisture - Soils
Uncontrolled terms: Conservation tillage - Contribution ratios - Conventional tillage - Long-term conservation - Nitrogen accumulation - Nitrogen distribution - Soil water - Winter wheat
Classification code: 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 804 Chemical Products Generally
Chemical Products Generally
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
Numerical data indexing: Age 2.00e+00yr, Percentage 4.43e+01%, Percentage 7.09e+01%, Percentage 8.05e+01%, Size 0.00e+00m to 1.00e+00m
DOI: 10.6041/j.issn.1000-1298.2017.02.032
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
45. Drought Impact Assessment Based on Spatial Up-scaling Methods of Vegetation Temperature Condition Index
Accession number: 20172103687855
Authors: Bai, Xuejiao (1); Wang, Pengxin (1); Zhang, Shuyu (2); Li, Li (1); Wang, Lei (1); Xie, Yi (1)
Author affiliation: (1) College of Information and Electrical Engineering, China Agricultural University, Beijing; 100083, China; (2) Shaanxi Provincial Meteorological Bureau, Xi’an; 710014, China
Corresponding author: Wang, Pengxin(wangpx@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 172-178
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Up-scaling method for inferring spatial information from a pixel scale to a basic unit scale has significant effects on aggregating results and decision-making. Therefore, developing appropriate methods to accurately up-scale spatial data is the key to infer useful drought information. The time series of vegetation temperature condition index (VTCI) drought monitoring results in Guanzhong Plain from early March to late May in the years from 2008 to 2013 were spatially transformed from a pixel scale to a basic unit scale by using the dominant class variability-weighted method (DCVW), arithmetic average variability-weighted method (AAVW) and median pixel variability-weighted method (MPVW) in the distributed mode and aggregated mode to obtain the aggregated VTCIs. The weighted VTCIs of winter wheat in main growth period were calculated, and the regression analysis between the weighted VTCIs and winter wheat yields was applied as references to evaluate up-scaling methods. The results showed that the regression analysis results of the three methods in the distributed up-scaling mode were generally better than those in the aggregated up-scaling mode. The regression analysis results in the distributed up-scaling mode also indicated that the computing accuracy was high by DCVW and AAVW and was low by MPVW. DCVW in the distributed up-scaling mode was the most accurate method with the highest determination coefficient and the lowest estimated standard error, which were 0.64 and 289.97 kg/hm2, respectively. The estimation yields of winter wheat which obtained by DCVW were very close to the levels of statistics yearbook of Shaanxi Province, indicating that the estimation precision of DCVW mehtod was high, and the method was robust. Overall, the method of DCVW in distributed up-scaling mode was the most reasonable approach to up-scale VTCIs in Guanzhong Plain from a pixel scale to a basic unit scale. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Scales (weighing instruments)
Controlled terms: Crops - Decision making - Drought - Pixels - Regression analysis - Vegetation
Uncontrolled terms: Determination coefficients - Estimation precision - Impact assessments - Precision evaluation - Spatial informations - Upscaling - Vegetation temperature condition index - Winter wheat yields
Classification code: 444 Water Resources
Water Resources
- 821.4 Agricultural Products
Agricultural Products
- 912.2 Management
Management
- 922.2 Mathematical Statistics
Mathematical Statistics
- 943.3 Special Purpose Instruments
Special Purpose Instruments
DOI: 10.6041/j.issn.1000-1298.2017.02.023
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
46. Mechanism Analysis and Simulation of Water Transport Driven by Environmental Factors for Greenhouse Muskmelon
Accession number: 20172103687863
Authors: Zhang, Dalong (1); Song, Xiaoming (1); Du, Qingjie (1); Jiao, Xiaocong (1); Li, Jun (2); Li, Jianming (1)
Author affiliation: (1) College of Horticulture, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) Agricultural and Animal Husbandry Bureau of Weining County, Bijie; 553100, China
Corresponding author: Li, Jianming(lijianming66@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 232-239 and 214
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Water transport through soil-plant-atmosphere continuum was a complex process, which was regulated at a variety of organizational and time scales. Quantification of the relationship between environmental factors, biophysical regulation and transpiration was critical for improving water use efficiency. Taking soil moisture, air temperature, relative humidity and photosynthetic active radiation as experimental factors, a composite quadratic orthogonal regressive rotation design of four factors and five levels was applied to characterize the co-ordination between environmental factors that driving and regulating transpiration of muskmelon. Soil moisture was maintained by weighing method and environmental factors were controlled by growth chambers. Transpiration and physiological parameters were determined under different combinations of environmental factors. According to stomatal behavior and vapour diffusion, a transpiration rate model was developed. Stomatal conductance was simulated by using Jarvis model with multiple environmental factors as model inputs. The proposed transpiration model had satisfactory performance with only meteorological input requirements, and thus it was an effective approach for calculating crop transpiration for greenhouse grown muskmelon. Characterization of main effect, single effect and marginal effect of environmental factors was determined. All of the environmental factors were positively correlated with transpiration rate except relative humidity. Correlation between transpiration and soil moisture, temperature can be described in linear functions with positive slopes. Whereas photosynthetic active radiation exhibited parabolic functions with transpiration rate. Relative humidity was negatively linked with transpiration. The present results demonstrated that environmental factors were tightly coupled with water transport. Coupling effects between two environmental factors were quantified by regression model, with other factors were uniformity maintained at a constant level. Individual contribution of soil moisture and air temperature in improving transpiration was enhanced by their coupling effects, which may be attributed to the larger driving force for water transport caused by the enhanced water potential gradients between soil and atmosphere. Therefore, transpiration was maximized, with increased soil moisture and air temperature. Relative humidity was negatively linked with vapor pressure deficit, thus the driving force of water flow at leaf-atmosphere interface was suppressed with the relative humidity. Physiological roles of soil moisture or air temperature in promoting water flow were significantly suppressed when coupled with relative humidity. Photosynthetic active radiation was not significantly correlated with other environmental factors in mediating water transport through soil-plant-atmosphere continuum. Coordination between hydraulic conductivity and stomatal sensitivity performed significant roles in maintaining a balance between vapour and liquid phase water transport. Hydraulic conductivity and stomatal conductance followed similar patterns with the increase of soil moisture, temperature and photosynthetic active radiation. Hydraulic conductivity and stomatal conductance were at maximum values when leaves were exposed to optimal ranges of environmental factors. It was demonstrated that the response of plant transpiration to environmental factors was not only determined by its individual function, coupling effects between environmental factors and physiological regulatory systems also performed significant roles in modulating water driving force. These observations provided novel information for improving water use efficiency of greenhouse grown muskmelon. Mechanism of environmental factors in regulating plant transpiration was explored under controlled environment by using growth chamber, which needed a further examination under greenhouse growth condition. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Atmospheric temperature
Controlled terms: Efficiency - Environmental chambers - Environmental regulations - Flow of water - Gas emissions - Greenhouses - Hydraulic conductivity - Hydraulics - Moisture - Phase interfaces - Physiological models - Physiology - Plants (botany) - Regression analysis - Soil moisture - Soils - Transpiration
Uncontrolled terms: Coupling effect - Environmental factors - Hydraulic conductance - Muskmelon - Orthogonal design
Classification code: 443.1 Atmospheric Properties
Atmospheric Properties
- 454.2 Environmental Impact and Protection
Environmental Impact and Protection
- 461.9 Biology
Biology
- 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 631.1.1 Liquid Dynamics
Liquid Dynamics
- 632.1 Hydraulics
Hydraulics
- 801.4 Physical Chemistry
Physical Chemistry
- 821.6 Farm Buildings and Other Structures
Farm Buildings and Other Structures
- 913.1 Production Engineering
Production Engineering
- 922.2 Mathematical Statistics
Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2017.02.031
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
47. Effect of Inulin on Moisture Migration Behavior in Wheat Dough
Accession number: 20172103687877
Authors: Luo, Denglin (1); Liang, Xuping (1); Xu, Baocheng (1); Xu, Wei (2); Han, Sihai (1); Zhou, Lu (1)
Author affiliation: (1) College of Food and Bioengineering, Henan University of Science and Technology, Luoyang; 471003, China; (2) College of Life Science, Xinyang Normal University, Xinyang; 464000, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 335-341
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to investigate the influence of inulin on water migration in wheat dough, the freezable water (loosely bound water and free water) and non-freezable water (tightly bound water) of wheat dough with different addition proportions (0, 2.5%, 5.0%, 7.5% and 10.0%) of short-chain, natural and long-chain inulin were determined by using differential scanning calorimetric (DSC) and nuclear magnetic resonance (NMR) techniques. The results of DSC showed that inulin with different degrees of polymerization (DP) all decreased freezable water content and increased non-freezable water content. And the effect of long-chain inulin on freezable water content was the most obvious. NMR results showed that with the increase of three kinds of inulin added, the contents of tightly bound water and free water were all increased in the dough, while the loosely bound water content was reduced, suggesting that the addition of three types of inulin all promoted the interaction between protein and water and inhibited the interaction between starch and moisture. The short-chain inulin and natural inulin had more obvious impact on the content of free water of the dough. On the other hand, the long-chain inulin had more significant influence on the content of tightly bound water; three kinds of inulin all had obvious effect on the loosely bound water content. In addition, the results of water state in the dough measured by DSC and NMR were consistent; there was a significant correlation between water migration and inulin addition. The test could provide data references for studying water distribution during the making process of dough and adjusting the product processing technology. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Polysaccharides
Controlled terms: Calorimetry - Chains - Moisture - Nuclear magnetic resonance - Water content - Water supply systems
Uncontrolled terms: Bound water contents - Degrees of polymerizations - Differential scanning calorimetric - Dough - Inulin - Moisture migration - Nuclear magnetic resonance techniques - Water distributions
Classification code: 446.1 Water Supply Systems
Water Supply Systems
- 602.1 Mechanical Drives
Mechanical Drives
- 804.1 Organic Compounds
Organic Compounds
- 944.6 Temperature Measurements
Temperature Measurements
Numerical data indexing: Percentage 1.00e+01%, Percentage 2.50e+00%, Percentage 5.00e+00%, Percentage 7.50e+00%
DOI: 10.6041/j.issn.1000-1298.2017.02.045
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
48. Analysis of Spatial Pattern and Driving Factors for Abandoned Arable Lands in Underdevelopment Region
Accession number: 20172103687851
Authors: Niu, Jiqiang (1); Lin, Hao (1); Niu, Yingnan (1); Fan, Yong (1); Tang, Wenwu (2)
Author affiliation: (1) School of Geographic Sciences, Xinyang Normal University, Xinyang; 464000, China; (2) Department of Geography and Earth Science, University of North Carolina at Charlotte, Charlotte; 28223, United States
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 141-149
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: With rapid urbanization and industrialization, rural work forces have migrated to cities, leading to remarkable reduction in rural poulation. So large amounts of arable lands have been abandoned in China in recent years. Abandoned arable lands in under development region of China have seriously affected the redline of arable land and national food security, which has become a major practical problem facing urban-rural integration. Multispectral remote sensing has the advantage of wide range and high speed in terms of data acquisition. It has great potential in the study of lands use. A new research approach and technical roadmap were proposed for abandoned land information extraction based on remote sensing, geographic information system, support vector machines and landscape ecological index. The study area, Zilu town, Henan province, China, is a typical underdevelopment region. Four scenes Landsat-8 OLI data from 2013 to 2015 were used to extract abandoned arable land, and its spatial-temporal distribution was analyzed based on landscape metrics. Furthermore, analysis of driving factors was conducted, such as terrain, traffic, irrigation conditions and farming radius in terms of the impact of abandoned arable lands in the study area. The results showed that the accuracy of extracting abandoned arable lands using RS was above 90%. The area of abandoned arable lands was divided into seasonal and perennial abandoned, and the former was more severe. The factors of terrain, traffic, irrigation conditions and farming radius affected the spatial-temporal distribution of abandoned arable lands, and the slope of the terrain had the greatest impact. The results can provide technical support for spatial information extraction of abandoned arable land in underdevelopment region, and can be applied to establishment of regional sustainable development policy. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Agriculture
Controlled terms: Artificial intelligence - Data acquisition - Data mining - Factor analysis - Food supply - Geographic information systems - Information analysis - Information retrieval - Information systems - Irrigation - Land use - Landforms - Remote sensing - Rural areas - Urban planning
Uncontrolled terms: Arable land - Driving factors - Multispectral remote sensing - Regional sustainable development - Spatial information extraction - Spatial patterns - Spatial-temporal distribution - Urban-rural integrations
Classification code: 403 Urban and Regional Planning and Development
Urban and Regional Planning and Development
- 403.1 Urban Planning and Development
Urban Planning and Development
- 481.1 Geology
Geology
- 723.2 Data Processing and Image Processing
Data Processing and Image Processing
- 723.4 Artificial Intelligence
Artificial Intelligence
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 821.3 Agricultural Methods
Agricultural Methods
- 822.3 Food Products
Food Products
- 903.1 Information Sources and Analysis
Information Sources and Analysis
- 903.3 Information Retrieval and Use
Information Retrieval and Use
- 922.2 Mathematical Statistics
Mathematical Statistics
Numerical data indexing: Percentage 9.00e+01%
DOI: 10.6041/j.issn.1000-1298.2017.02.019
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
49. Influence of Geometrical Parameters of Labyrinth Passage of Drip Irrigation Emitter on Sand Movement
Accession number: 20172103687866
Authors: Yu, Liming (1); Xu, Xia (2); Yang, Qiliang (1); Wu, Yongdong (3); Bai, Xiaojun (3)
Author affiliation: (1) Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming; 650500, China; (2) School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha; 410114, China; (3) Qinghai Provincial Water Conservancy and Hydropower Survey and Design Institute, Xining; 810001, China
Corresponding author: Yang, Qiliang(yangqilianglovena@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 255-261
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to obtain the optimum geometrical parameters for improving the anti-clogging performance of labyrinth flow path of drip emitter, 16 kinds of flow paths were designed according to the structural parameters such as angle, height, upper base, offset and width. An Eulerian-Lagrange liquid-solid multiphase turbulence model combined with the kinetic theory of granular flow was used to carry out simulation based on coupled CFD-DEM water-sand two-phase flow in drip irrigation emitter, which analyzed the pass rate of sand group, the percentage decrease in speed of sand, the movement and distribution regulars and force and so on. The result indicated that the clogging performance of labyrinth channel could be expressed by the pass rate of sand. There existed a negative relationship between the pass rate and percentage drop of sand group speed. The speed descending of sand movement was the key factor that affected the sand pass rate in labyrinth channel. The angle and width were the main structural parameters of flow passage that affected the water flow characteristics. The speed of sand particles depended on the flow characteristics of the flow channel, and the angle had a significant influence on sand speed. Sand was always drawn by drag force from water flow in the optimum structure. Most of the sand ran in the mainstream area, so they maintained high movement speed. Little sand lost kinetic energy, thereby it reduced the blocking probability. This method was applied to analyze movement and distribution of sand group, understand the movement of sand from micro-view perspective, and it had become an efficient technique in structural design of labyrinth channel. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 16
Main heading: Two phase flow
Controlled terms: Blocking probability - Channel flow - Computational fluid dynamics - Computer simulation - Drag - Flow of water - Geometry - Granular materials - Hydraulics - Irrigation - Kinetic energy - Kinetics - Sand - Speed - Structural design - Structural optimization - Turbulence models
Uncontrolled terms: Drip irrigation - Flow charac-teristics - Kinetic theory of granular flow - Labyrinth channels - Multiphase turbulence - Optimum structures - Pass rate - Structural parameter
Classification code: 408.1 Structural Design, General
Structural Design, General
- 483.1 Soils and Soil Mechanics
Soils and Soil Mechanics
- 631.1 Fluid Flow, General
Fluid Flow, General
- 631.1.1 Liquid Dynamics
Liquid Dynamics
- 632.1 Hydraulics
Hydraulics
- 723.5 Computer Applications
Computer Applications
- 821.3 Agricultural Methods
Agricultural Methods
- 921 Mathematics
Mathematics
- 921.5 Optimization Techniques
Optimization Techniques
- 951 Materials Science
Materials Science
DOI: 10.6041/j.issn.1000-1298.2017.02.034
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
50. Lectotype Design and Experiment of Variable Actuated Layout 5R Parallel Kinematic Mechanism
Accession number: 20172103687699
Authors: Hou, Zhili (1); Wu, Wen’ge (1); Li, Ruiqin (1); Qin, Huibin (1)
Author affiliation: (1) School of Mechanical and Power Engineering, North University of China, Taiyuan; 030051, China
Corresponding author: Li, Ruiqin(1085223859@qq.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 378-384
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Considering the packaging requirements of different sizes of customized cartons, the design method of variable actuated layout for 5R parallel kinematic mechanism was proposed. The kinematic analysis of 5R parallel mechanism was carried out, and different workspace maps were drawn by geometric method. A method of searching the reachable workspace through tracing the motion trajectory was proposed. These provided the basis for configuration application of the carton packaging mechanism. The folding process of carton cover was analyzed, and the 5R mechanism of the two actuated motors with coincident joint was selected as finger prototype to fold the flap. The motion parameters of actuated motors were extracted through the motion simulation, the fitted analytic function was input into the control program of finger mechanism. The experimental results verified that the expected motion trajectory of carton flap and finger mechanism had good controllability. Thus a reconfigurable carton packaging machine was developed to demonstrate the ability to erect different sizes of the cartons, which was different from the production line. By means of restructuring module structure and reconfiguration control program, the end effector was flexibility and controllable. The device had the characteristics of small space occupation and flexible control. It would be helpful for the delivery staff to improve the working efficiency and reduce the workload. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 19
Main heading: Design
Controlled terms: Kinematics - Mechanisms
Uncontrolled terms: Actuated layout - Controllable motion - Motion trajectories - Parallel kinematic mechanisms - Reachable workspace - Reconfigurable - Reconfiguration control - Workspace
Classification code: 601.3 Mechanisms
Mechanisms
- 931.1 Mechanics
Mechanics
DOI: 10.6041/j.issn.1000-1298.2017.02.051
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
51. Impacts of Climate Change on Runoff of Jinghe River Based on SWAT Model
Accession number: 20172103687867
Authors: Jiang, Ya’nan (1); Wang, Lei (1); Wei, Xiaomei (1); Ding, Xingchen (2)
Author affiliation: (1) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; Shaanxi; 712100, China; (2) School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin; 150030, China
Corresponding author: Wei, Xiaomei(weixiaomei57@tom.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 262-270
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: When trying to analyze water resources supply and demand balance under climate change for river basin and irrigation district, the annual runoff of river and its monthly distribution in representative hydrological years are necessary and basic data to evaluate the available surface water supply. In order to predict the impacts of future climate change on runoff of Jinghe River, a SWAT model was developed by collecting and processing large amounts of data such as the hydrological, geological and meteorological data. The model was calibrated and validated by using 11 years monthly runoff data from Zhangjiashan hydrological station and evaluated with two targets (the Nash-Sutcliffe coefficient (Ns) and determination coefficient (R2)). Values of Nsand R2in calibration and validation stages were both greater than 0.7, which meant that the model was capable of simulating runoff responses to climate change. Three representative hydrological years were chosen after analyzing and calculating the precipitation frequency, which were the wet year (25%), normal year (50%) and dry year (75%). Two future climate change scenarios were developed based on previous study, in which precipitation and temperature trends of future three periods (2020s, 2050s and 2080s) in Jinghe River were predicted by statistically downscaling the output data of HadCM3 under A2 and B2 scenarios, and the river annual runoff and its monthly distribution for representative hydrological years in three future periods were forecasted. The results showed that the annual runoff of representative hydrological years in three future periods of both scenarios were decreased, comparing with base years. The changing rates were 26%~42% and 25%~35%, respectively in wet year, 23%~37% and 21%~25% in normal year, 23%~38% and 20%~31% in the dry year. Under both scenarios, the distributions of monthly runoff of representative hydrological years in three future periods had the same trends as base years. And the changing trends of monthly runoff were basically conformed to the tendencies of monthly precipitation in corresponding scenarios and times. The major amplitudes of monthly runoff were appeared in the peak. In scenarios A2 and B2, the changing rates of peak value in three future periods respectively were 41%, 43%, 61% and 34%, 37%, 56% in August of the wet year, 15%, 23%, 38% and 21%, 18%, 31% in July of the normal year, 20%, 36%, 46% and 24%, 31%, 28% in June of the dry year. But the monthly runoff of February in three future periods under scenario B2 was increased from 17.71 m3/s to 24.93 m3/s, 38.79 m3/s and 63.63 m3/s, respectively. By calculating the nonuniform coefficient of the runoff annual distribution (Cvy), it was showed that the value of Cvyin wet year was decreased from 1.06 to 0.71 (scenario A2) and 0.74 (scenario B2). © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Climate change
Controlled terms: Calibration - Climate models - Economics - Meteorology - Rivers - Runoff - Surface water resources - Surface waters - Water resources - Water supply
Uncontrolled terms: Calibration and validations - Determination coefficients - Hydrological years - Large amounts of data - Nash-Sutcliffe coefficient - Precipitation frequency - Supply and demand balances - SWAT model
Classification code: 443 Meteorology
Meteorology
- 443.1 Atmospheric Properties
Atmospheric Properties
- 444 Water Resources
Water Resources
- 444.1 Surface Water
Surface Water
- 446.1 Water Supply Systems
Water Supply Systems
- 921 Mathematics
Mathematics
- 971 Social Sciences
Social Sciences
Numerical data indexing: Age 1.10e+01yr, Percentage 1.50e+01%, Percentage 1.80e+01%, Percentage 2.00e+01%, Percentage 2.10e+01%, Percentage 2.30e+01%, Percentage 2.40e+01%, Percentage 2.50e+01%, Percentage 2.80e+01%, Percentage 3.10e+01%, Percentage 3.40e+01%, Percentage 3.60e+01%, Percentage 3.70e+01%, Percentage 3.80e+01%, Percentage 4.10e+01%, Percentage 4.30e+01%, Percentage 4.60e+01%, Percentage 5.00e+01%, Percentage 5.60e+01%, Percentage 6.10e+01%, Percentage 7.50e+01%
DOI: 10.6041/j.issn.1000-1298.2017.02.035
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
52. Temporal and Spatial Distribution Prediction of Shallow Groundwater Level Based on ELM Model
Accession number: 20172103687861
Authors: Yu, Liming (1); Yan, Weiguang (2); Gong, Daozhi (3, 4); Li, Yuanyuan (3, 4); Feng, Yu (3, 4); Jiang, Danxi (5)
Author affiliation: (1) Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming; 650500, China; (2) School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha; 410114, China; (3) Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing; 100081, China; (4) State Key Engineering Laboratory of Crops Efficient Water Use and Drought Mitigation, Beijing; 100081, China; (5) Ningxiang Hydro and Power Design Institute, Changsha; 410004, China
Corresponding author: Gong, Daozhi(gongdaozhi@caas.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 215-223
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to achieve high-precision prediction of temporal and spatial distribution of the groundwater level in shallow groundwater cones region, a model was constructed firstly based on extreme learning machine (ELM). By choosing different combination factors of groundwater recharge and discharge as the input parameters of model and observing data of 28 wells as predicted target in Shijiazhuang plain, the error of spatial distribution trend was analyzed by using ArcGIS software. The results showed that the ELM model based on the water balance theory could accurately reflect the non-linear relationship of groundwater system under the influence of human and nature activity. The root mean square error (RMSE) of model under the condition without exploitation or precipitation as input factor was two times higher than that under the condition without other factors, and the coefficient of efficiency (Ens) and coefficient of determination (R2) were further reduced. Compared with the BP model, the RMSE of ELM model was reduced by 43.6%, and the scope of error was reduced by 46.4%. Ensand R2were improved to 0.99. The tendency of error distribution showed that it was decreased from the south and southeast to the central. The RMSE of ELM model was obviously lower than that of BP model in all the regions. The accuracy of ELM model (RMSE was less than 1.82 m, Enswas higher than 0.95) was higher than that of BP model (RMSE was more than 3.00 m, Enswas less than 0.85) in southern high error region. Therefore, exploitation and precipitation were the main impact factors on the groundwater dynamic in the model. Meanwhile, the stability, accuracy and space uniformity of ELM model were better than those of BP model. And the transplantation results of ELM model were more satisfactory. The model could be used to forecast groundwater level of other unknown wells based on given data. Therefore, the ELM model could be used as a recommended model for predicting groundwater level under conditions of missing hydrogeological and groundwater recharge data. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 30
Main heading: Spatial distribution
Controlled terms: Errors - Forecasting - Groundwater - Knowledge acquisition - Learning systems - Mean square error - Neural networks - Recharging (underground waters)
Uncontrolled terms: Coefficient of determination - Coefficient of efficiencies - Extreme learning machine - Ground water recharge - Non-linear relationships - Root mean square errors - Shallow groundwater levels - Temporal and spatial distribution
Classification code: 444.2 Groundwater
Groundwater
- 723.4 Artificial Intelligence
Artificial Intelligence
- 921 Mathematics
Mathematics
- 922.2 Mathematical Statistics
Mathematical Statistics
Numerical data indexing: Percentage 4.36e+01%, Percentage 4.64e+01%, Size 1.82e+00m, Size 3.00e+00m
DOI: 10.6041/j.issn.1000-1298.2017.02.029
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
53. Single-step Method Based Finite Frequency Static Output Feedback Control for Vehicle Active Suspension Systems
Accession number: 20172103687880
Authors: Wang, Gang (1); Chen, Changzheng (1); Yu, Shenbo (1)
Author affiliation: (1) School of Mechanical Engineering, Shenyang University of Technology, Shenyang; 110870, China
Corresponding author: Chen, Changzheng(CCZedu@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 354-361
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A static output-feedback based finite frequency H∞controller design method was proposed for vehicle active suspension systems. The static output-feedback controller gain matrix was directly derived via a single-step linear matrix inequality (LMI) optimization. As the previous finite frequency H∞control theorem did not satisfy the sufficient conditions of single-step method and contained some bilinear terms. The static output-feedback control problem of previous finite frequency H∞control theorem was infeasible. A new static output-feedback based finite frequency H∞control theorem was given by using the generalized Kalman-Yakubovich-Popov (GKYP) lemma. The initial static output-feedback controller gain matrix can be directly solved by a single-step LMI optimization. Compared with the traditional iterative linear matrix inequality (ILMI) and cone complementarity linearization (CCL) algorithms, the design process was greatly simplified. The initial infeasibility issue of the static output-feedback control was resolved by using the state-feedback information. Finally, the effectiveness of the proposed method was validated by numerical and experimental results. The results for different road excitations showed that the finite frequency controlling can improve ride comfort effectively, while keeping suspension dynamic deflection, tire dynamic load and controlling input within allowable values. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 24
Main heading: Feedback
Controlled terms: Active suspension systems - Automobile suspensions - Controllers - Dynamic loads - Feedback control - Frequency domain analysis - Iterative methods - Linear matrix inequalities - Magnetic levitation vehicles - Matrix algebra - Numerical methods - State feedback - Suspensions (components) - Vehicles
Uncontrolled terms: Active suspension - Cone complementarity linearization - Frequency domains - Generalized kalman-yakubovich-popov lemmata - Iterative linear matrix inequality - Linear matrix inequality optimizations - Static output feedback - Static output feedback controllers
Classification code: 408.1 Structural Design, General
Structural Design, General
- 601.2 Machine Components
Machine Components
- 662.4 Automobile and Smaller Vehicle Components
Automobile and Smaller Vehicle Components
- 731.1 Control Systems
Control Systems
- 732.1 Control Equipment
Control Equipment
- 921 Mathematics
Mathematics
DOI: 10.6041/j.issn.1000-1298.2017.02.048
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
54. Design and Experiment of Wine Grape Trellis Traveling Stripping Platform
Accession number: 20172103687845
Authors: Li, Chao (1); Xing, Jiejie (1); Xu, Liming (1); Shi, Li’na (1); Gao, Zhenming (1); Liu, Wen (1)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China
Corresponding author: Xu, Liming(xlmoffice@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 98-103
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In recent years, the rapid growth of wine industry in China is promoting the increase of vineyards. However, the wine grapes are harvested entirely depending on hand picking in China with high cost. The old harvesting method restricts the widespread popularization and planting of wine grapes. Research on picking machine and picking mechanism of wine grapes is in its infancy in China. A study was conducted to change the artificial harvesting status of wine grapes, promote the mechanization of wine grapes thread mechanism, and establish the theoretical guidance and design basis for the picking machine of wine grapes under Chinese national conditions. In previous studies, single bunches of grapes threaded by flexible bow teeth had been certificated to be feasible. As the process of harvesting is quite complex, it needs to be studied further. Therefore, kinematic and dynamic analyses of the harvesting process were carried out to further study on threshing mechanism, and there were three factors, including rotating speed, helix angle and travel speed, which were proved to be important to harvesting. Then the walking ability test bench of indoor harvesting which could be used to study a variety of potential effective factors and new type of threshing devices was designed and orthogonal experiment was conducted. The evaluating indicators of this test were threshing rate and breakage rate, the factors of this test were rotating speed, helix angle and travel speed, and the samples of this test were the Cabernet Sauvignon. The test result showed that only rotating speed and travel speed can influence the threshing rate to a certain extent. With the increase of rotating speed from 200 r/min to 300 r/min, the threshing rate was increased from 75.7% to 92%. With the increase of travel speed, the threshing rate was decreased from 94.7% to 78%. Moreover, for the breakage rate, the effects of three factors were not significant and the breakage rate was maintained at about 20%. This study provided a reference for design and improvement of the flexible comb. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 15
Main heading: Wine
Controlled terms: Agriculture - Harvesting - Machinery - Rotating machinery - Speed
Uncontrolled terms: Cabernet-Sauvignon - Evaluating indicators - Flexible bow teeth - Harvesting methods - National conditions - Orthogonal experiment - Travelling stripping platform - Wine grapes
Classification code: 601.1 Mechanical Devices
Mechanical Devices
- 821 Agricultural Equipment and Methods; Vegetation and Pest Control
Agricultural Equipment and Methods; Vegetation and Pest Control
- 821.3 Agricultural Methods
Agricultural Methods
- 822.3 Food Products
Food Products
Numerical data indexing: Percentage 2.00e+01%, Percentage 7.57e+01% to 9.20e+01%, Percentage 9.47e+01% to 7.80e+01%, Rotational_Speed 2.00e+02RPM to 3.00e+02RPM
DOI: 10.6041/j.issn.1000-1298.2017.02.013
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
55. Machine Vision-based Selection Machine of Corn Seed Used for Directional Seeding
Accession number: 20172103687836
Authors: Wang, Qiao (1); Chen, Bingqi (1); Zhu, Deli (1, 2); Liangxi, Huizi (1, 3); Dai, He (1); Chen, Hongmi (1)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) College of Computer and Information, Chongqing Normal University, Chongqing; 400047, China; (3) College of Mechanical and Electrical Engineering, Shihezi University, Shihezi; 832003, China
Corresponding author: Chen, Bingqi(fbcbq@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 48
Issue: 2
Issue date: February 25, 2017
Publication year: 2017
Pages: 27-37
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to meet the requirements for corn seed from directional seeding, a kind of corn seed dynamic selection machine was developed based on image processing technology. Firstly, the composition and working principle of this machine were introduced, and the device of blowing unqualified corn seed as well as its method of completing the blowing was designed. Also the dynamic detection method of corn seed images was developed. And then through the analysis of RGB color feature of these images, the extracting solution of the whole seed area and different color areas of seed in a corn seed image was obtained successively. Meanwhile, combined with the analysis of corn seed morphological characteristics, totally 20 detection indicators were set up to describe the eligibility of corn seed, such as perimeter, area, long axis, short axis. And the acceptable range of above indicators was determined through test statistics. In view of the above, the eligibility judgment methods of the following types of seed were analyzed respectively and executed successfully: seed with black embryo exposed in the tip, small seed, round seed, worm-eaten and damaged seed, moldy seed and other seed which did not conform to directional seeding. Furthermore, two points on contour line near two joints of adhesive seed were obtained, and it can be found that the ratio of the shorter distance of them along the contour line to the linear distance of them was larger than the corresponding value of any two points on the contour line of a single seed, which according to the adhesive seed can be detected. In the experiment, the results showed that the eligibility detection accuracy of corn seed was 96%, the judgment accuracy of adhesive seed was 99%, and the efficiency of blowing unqualified corn seed was 98%. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Computer vision
Controlled terms: Contour measurement - Image processing - Statistical tests
Uncontrolled terms: Corn seeds - Detection accuracy - Dynamic detection - Dynamic selection - Image processing technology - Morphological characteristic - Selection - Test statistics
Classification code: 723.5 Computer Applications
Computer Applications
- 922.2 Mathematical Statistics
Mathematical Statistics
Numerical data indexing: Percentage 9.60e+01%, Percentage 9.80e+01%, Percentage 9.90e+01%
DOI: 10.6041/j.issn.1000-1298.2017.02.004
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2017 Elsevier Inc.
Data Provider: Engineering Village
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