2014年第11期
2014年第45卷第11期共收錄53篇
1. Accession number: 20145200366386
Title: Influence analysis of lower labyrinth pressure pulsation for stability of pumped-storage unit
Authors: Yao, Ze1 ; Zhi, Falin2 ; Yan, Zongguo3 ; Huang, Qingsong1 ; Bi, Huili2 ; Wang, Zhengwei2
Author affiliation: 1 Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou , China
2 Department of Thermal Engineering, Tsinghua University, Beijing , China
3 College of Water Resources and Civil Engineering, China Agricultural University, Beijing , China
Corresponding author: Wang, Zhengwei
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 134-138
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Pumped-storage power station was widely concerned since its important role. The running stability of the pump-turbine unit as the core component was essential to the safe and stable operation of the plant. The stability tests were conducted under working condition of hydroelectric generating set. The test data were analyzed, including the lower labyrinth pressure pulsation, the guide bearing swing and the head cover vibration. It was revealed that the main frequency causing the labyrinth pressure pulsation was the rotation frequency, the blade passing frequency of runner and the vortex rope of draft tube. The signals of labyrinth pressure fluctuation were strong correlated with the signals of the turbine bearing swing and the head cover vibration and had a strong influence on the vertical/horizontal vibration and swing of turbine.
Number of references: 14
Main heading: Vibration analysis
Controlled terms: Digital storage - Hydraulic turbines - Pumped storage power plants
Uncontrolled terms: Blade passing frequency - Coherence analysis - Hydroelectric generating set - Pressure fluctuation - Pumped-storage power stations - Pumped-storage units - Rotation frequencies - Vibration and swing
Classification code: 402.1 Industrial and Agricultural Buildings - 617.1 Hydraulic Turbines - 722.1 Data Storage, Equipment and Techniques - 943.2 Mechanical Variables Measurements
DOI: 10.6041/j.issn.1000-1298.2014.11.021
Database: Compendex
2. Accession number: 20145200366390
Title: Dynamic simulation for sprinkler irrigation water distribution with uniformity
Authors: Han, Wenting1, 2 ; Wang, Xuan1 ; Sun, Yu1
Author affiliation: 1 College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling; Shannxi , China
2 Institute of Water Saving Agriculture in Arid Areas of China, Northwest A and F University, Yangling; Shannxi , China
Corresponding author: Han, Wenting
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 159-164 and 200
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Distribution uniformity (DU) and Christiansen uniformity coefficient (CU) are two important indicators for evaluating the hydrodynamic performance and irrigationg quality of sprinkler irrigation system. In order to research the impact of the pressure, sprinkler combinations and interpolation methods on the distribution uniformity and Christiansen uniformity coefficient, CU and DU were computed by linear interpolation, cubic interpolation, cubic spline twice interpolation, inverse distance weighting method and plane interpolation method with two combinations (rectangular and regular triangle), and 1m sampling space. Using the experimental data of FY RB-471 sprinklers without wind simulated the water distribution under different pressures. The results showed that CU calculated form rectangular combination date were less than form regular triangle combination date by 1.56%~4.77%. Similarly, DU calculated form rectangular combination date were less than form regular triangle combination date by 4.26%~9.19%. Different interpolation methods for the calculation results of CU and DU are not obvious, while the pressure is an important factor for affecting the sprinkler uniformity.
Number of references: 22
Main heading: Interpolation
Controlled terms: Computer simulation - Hose - Sprinkler systems (irrigation) - Water supply systems
Uncontrolled terms: Distribution uniformity - Hydrodynamic performance - Inverse distance weighting method - Linear Interpolation - Sprinkler - Sprinkler irrigation - Uniformity coefficient - Water distributions
Classification code: 446.1 Water Supply Systems - 619.1 Pipe, Piping and Pipelines - 723.5 Computer Applications - 821.1 Agricultural Machinery and Equipment - 921.6 Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2014.11.025
Database: Compendex
3. Accession number: 20145200366388
Title: Parameter optimization and validation for RZWQM2 model using PEST method
Authors: Sun, Mei1 ; Zhang, Xiaolin1 ; Feng, Shaoyuan2 ; Huo, Zailin1
Author affiliation: 1 College for Water Conservancy and Civil Engineering, China Agricultural University, Beijing , China
2 College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou , China
Corresponding author: Huo, Zailin
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 146-153
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A software for automatic parameter estimation (PEST) was used to estimate 24 parameters in the root zone water quality model (RZWQM2) and analyze the sensitivity of each parameter by controlling the proportion of function values of simulation difference from various observation variables in the objective function, including soil moisture, soil nitrate, leaf area index and yield of crop. The results show that parameters of PHW, P1VW and PHM were the three most influential parameters to the overall simulation performance of the RZWQM2 model when the proportion of simulation difference for each observation variable was closest. In contrast to the trial and error method, RZWQM2 model after calibrated with PEST could accurately simulate the moisture and nitrogen transport in soil profile and crop growth in a rotation system of waxy mazy and winter wheat. This study could help estimate RZWQM2 parameters in different agricultural management practices and could also provide a reference for the application of PEST in other models for parameter optimization.
Number of references: 27
Main heading: Computer simulation
Controlled terms: Computer software - Crops - Quality control - Sensitivity analysis - Soil moisture - Water quality
Uncontrolled terms: Agricultural management practice - Objective functions - Parameter optimization - PEST - Root Zone Water Quality Model (RZWQM2) - Simulation performance - Trial-and-error method - Waxy maize
Classification code: 453.2 Water Pollution Control - 483.1 Soils and Soil Mechanics - 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 821.4 Agricultural Products - 913.3 Quality Assurance and Control - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.11.023
Database: Compendex
4. Accession number: 20145200366375
Title: Application of machine vision in detection of broken shiitake
Authors: Chen, Hong1 ; Xia, Qing1 ; Zuo, Ting1 ; Tan, Hequn1 ; Bian, Yinbing2
Author affiliation: 1 College of Engineering and Technology, Hua Zhong Agricultural University, Wuhan , China
2 College of Plant Sciences and Technology, Hua Zhong Agricultural University, Wuhan , China
Corresponding author: Chen, Hong
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 60-67
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to detect the broken shiitake, a automatic detection system of shiitake was developed based on machine vision. Identification algorithms based on curve evolution and shiitake edge grayscale were presented. First, the background of shiitake images was removed, the edge of shiitake was tracked and then the coordinates of shiitake boundary was obtained. A closed curve was composed of these coordinates. Two initial curves could be generated from the interior and exterior of the closed curve respectively. Two final curves were evolved on those two initial curves, which met the condition of specific termination criterion. Two parameters (Nin, Nout) were extracted from the difference of final curves and initial curve. These parameters could determine the broken extent of shiitake and shiitake edge region were sampled with the method of morphology. Then four parameters could be extracted from the sequence of the gray scale of sampled regions. These parameters were mean (μ), variance (ρ), average width of peaks (Lp) and the maximum width of peaks (Lmax) respectively. The four parameters were analyzed with the method of pattern recognition and the broken extent of shiitake was obtained from the processing results. The final result was given with the results of both curve evolution and grayscale analysis. Experiments show that the accuracy of final shiitake detection model reached up to 88.33%, and the selection speed was 98 per minute.
Number of references: 21
Main heading: Computer vision
Controlled terms: Algorithms
Uncontrolled terms: Automatic detection systems - Average width - Curve evolution - Detection models - Identification algorithms - Shiitake - Termination criteria - Two parameter
Classification code: 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.11.010
Database: Compendex
5. Accession number: 20145200366374
Title: Orchard pest automated identification method based on posture description
Authors: Li, Wenyong1, 2 ; Chen, Meixiang2 ; Li, Ming2 ; Sun, Chuanheng2 ; Du, Shangfeng1
Author affiliation: 1 College of Information and Electrical Engineering, China Agricultural University, Beijing , China
2 National Engineering Research Center for Information Technology in Agriculture, Beijing , China
Corresponding author: Sun, Chuanheng
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 54-59
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Orchard pests monitoring is very important in precise pest management. The pests trapped by high-voltage current in orchard show different postures, which increase the difficulty of image automatic identification. A posture description-based method has been proposed to automatically represent image boundary and identify certain common pests in orchards. The performance of proposed method in posture description with rotation, translation and wing scale of image edge was tested. Posture feature vector and similarity difference threshold were determined by the calculation of average normalized Fourier descriptors (FDs) and discrete degree. Three types of pests with 200 sample images were tested, and it found that correct rate of target pest Dichocrocis punctiferalis (Guenee) was 86.7% and error rate was 2.6% when discrete degree threshold was 0.021 26. The experiment results indicate that this approach has a stable description ability for posture-shape and good recognition performance.
Number of references: 18
Main heading: Image processing
Controlled terms: Automation - Error analysis - Orchards
Uncontrolled terms: Automated identification - Automatic identification - Description abilities - Difference threshold - Feature vectors - Fourier descriptors - Image boundaries - Pest management
Classification code: 731 Automatic Control Principles and Applications - 732 Control Devices - 741 Light, Optics and Optical Devices - 821.3 Agricultural Methods - 921.6 Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2014.11.009
Database: Compendex
6. Accession number: 20145200366414
Title: Inverse dynamics of 3PUS-S (P) parallel metamorphic mechanism
Authors: Chang, Boyan1 ; Liu, Yanru1 ; Jin, Guoguang1
Author affiliation: 1 Key Laboratory of Advanced Mechatronics Equipment Technology, Tianjin Polytechnic University, Tianjin , China
Corresponding author: Jin, Guoguang
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 317-323
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The primary goal of this paper is to analyze the kinematic and dynamics of a 3PUS-S (P) parallel spherical metamorphic mechanism. It consists of a moving platform, base platform, three PUS legs and one middle S (P) metamorphic leg. A complete description of the position and orientation of the moving platform requires six variables. Since the parallel metamorphic mechanism has three degrees of orientation freedom in 1st configuration and extra one degree of translational freedom in 2nd configuration, which implies that only three variables are independent in 1st configuration and four variables in 2nd configuration. Firstly, the constraint equations describing the six motion coordinates of moving platform are derived and kinematic equations are established based on vector algebra method. Secondly, inverse dynamics equations of this metamorphic mechanism are established based on the Newton-Euler formulation. According to geometric and physical parameters of real mechanism, required driving and constraint forces can be obtained when the motion of moving platform and working load are given by solving the inverse dynamics equations. Furthermore the simulation result illustrates that 3PUS-S (P) parallel metamorphic mechanism can avoid impact damage by activating the constrained prismatic pair in middle leg.
Number of references: 19
Main heading: Mechanisms
Controlled terms: Dynamics - Euler equations - Kinematics
Uncontrolled terms: Constraint forces - Driving forces - Inverse dynamics - Metamorphic mechanisms - Newton Euler formulation
Classification code: 601.3 Mechanisms - 921 Mathematics - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2014.11.049
Database: Compendex
7. Accession number: 20145200366406
Title: Fusion of OLI image based on LBV transform and wavelet transform
Authors: Liu, Wei1 ; Wang, Conghua1 ; Yang, Xiaobo1 ; Luo, Weiqun1
Author affiliation: 1 College of Information Engineering, Tibet University for Nationalities, Xianyang , China
Corresponding author: Liu, Wei
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 264-271
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The aim of this study is to seek out the most suitable image fusion algorithm for OLI image of Landsat 8 satellite acquired in June 9, 2010, taking Yuyang country in Shaanxi Province as study area. Five kinds of image fusion algorithms have been employed, which are Brovey transform, High-pass filter transform, HIS transform, PCA transform and LBV-wavelet RF. The effectiveness of the five fusion algorithms has been evaluated based on spectral fidelity, high spatial frequency information gain, and supervised classification accuracy. Firstly, by visual evaluation this study evaluated whether fused images preserved spectral information of original multispectral image well, and whether retained texture and edges information of panchromatic image and avoided texture blurring. Secondly, by quantitative evaluation, spectrum character of fused images was analyzed by using gray average difference and gray root mean square error. Integration of the high frequency detail information of panchromatic images to fused images was analyzed by using correlation coefficient average and correlation root mean square error. The supervised classification accuracy of fused images was evaluated by using Kappa coefficient and overall classification accuracy. Results showed that LBV-wavelet RF was the best method in retaining spectral information of original multispectral image, and not causing spectral distortion, as well as achieving the highest SVM supervised classification accuracy. Overall classification accuracy and Kappa coefficient of fused image using this method were 84.01% and 0.787, achieved noticeable growth of 13.45% and 15.91% than original multispectral image. The proposed OLI image fusion algorithm could provide far more detailed topographic information compared with original multispectral dates and better service for improving visual interpretation and supervised classification accuracy.
Number of references: 13
Main heading: Image classification
Controlled terms: Algorithms - Classification (of information) - High pass filters - Image fusion - Mean square error - Textures - Wavelet decomposition
Uncontrolled terms: Fusion algorithms - Loess - OLI image - Plateau - Wind erosions
Classification code: 703.2 Electric Filters - 716 Telecommunication; Radar, Radio and Television - 716.1 Information Theory and Signal Processing - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 731.1 Control Systems - 921 Mathematics - 921.3 Mathematical Transformations - 933 Solid State Physics
DOI: 10.6041/j.issn.1000-1298.2014.11.041
Database: Compendex
8. Accession number: 20145200366396
Title: Esterification of waste frying oil using styrene type cation exchange resin catalyst
Authors: L, Pengmei1 ; Liu, Limei1, 2 ; Yang, Lingmei1 ; Yuan, Zhenhong1 ; Chen, Zibo3
Author affiliation: 1 Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou , China
2 University of Chinese Academy of Sciences, Beijing , China
3 Department of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha , China
Corresponding author: L, Pengmei
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 201-205 and 193
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Porous polystyrene-divinylbenzene was prepared by suspension polymerization, and then sulfonie acid ion exchange resin was obtained by sulfonated porous polystyrene-divinylbenzene. The resin's morphology and degree of sulfonation were characterized with SEM/EDS, BET, IR respectively. Esterification of waste frying oils with acid value of 63.0 mg/g was studied using cation exchange resin as catalyst to investigate its catalytic activity. 40.0% dosage of porogen was preferred when the polymerization conditions were 360 r/min, 1.0% dispersant, 1.0% initiator, 75 for 4 h and the heat to 85 for 6 h, while the sulfonation conditions were 1.0 mL/g dichloroethane, 5.0 mL/g sulfuric acid, 70 sulfonated for 1 h and the heat to 80~85 for 3 h, the optimum swelling time was 1 h, and the concentration of sulfuric acid was 98%. The maximum exchange capacity of the cation exchange resin W2 was 5.2 mmol/g in that condition. When the esterification was performed in the condition of 40.0% methanol, 10.0% W2, 70 stirring for 1.5 h, the crushing rate of W2 was only 10. 0% and the conversion rate of FFA reached to 86.8%. W2 is better than commercially available cation exchange resin PC101, and could be reused for 5 times.
Number of references: 15
Main heading: Ion exchange resins
Controlled terms: Catalyst activity - Esterification - Esters - Ion exchange - Oil shale - Polymerization - Polystyrenes - Positive ions - Styrene - Sulfonation - Sulfuric acid - Suspensions (fluids)
Uncontrolled terms: Acid ion exchange resin - Cation exchange resins - Degree of sulfonation - Exchange capacities - Frying oil - Polymerization conditions - Polystyrene divinylbenzenes - Suspension polymerization
Classification code: 512.1 Petroleum Deposits - 801 Chemistry - 802.2 Chemical Reactions - 804 Chemical Products Generally - 815.1.1 Organic Polymers - 815.2 Polymerization
DOI: 10.6041/j.issn.1000-1298.2014.11.031
Database: Compendex
9. Accession number: 20145200366371
Title: Control system of permanent magnet generator for boom potential energy recovery
Authors: Wang, Tao1 ; Wang, Qingfeng2
Author affiliation: 1 College of Mechanical and Vehicle Engineering, Hunan University, Changsha , China
2 State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou , China
Corresponding author: Wang, Tao
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 34-39
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Potential energy recovery can significantly reduce the boom energy consumption produced by frequent rising and lowering operations. As a critical component, the performance of the permanent magnet generator applied in energy recovery has a strong influence on energy conversion and motion control. Therefore, it is necessary to research and design the control system of the generator. Since there exist input and output parametric fluctuations, adaptive control and disturbance compensation were proposed in the current loop and the speed loop, respectively. Experiments were implemented on a test bench which is loaded with hydraulic approach. The results show that the good current and speed control performances were realized, and anti-disturb capability was also improved.
Number of references: 18
Main heading: Adaptive control systems
Controlled terms: Cold rolling - Construction equipment - Control systems - Electric generators - Energy utilization - Hydraulic machinery - Molecular physics - Permanent magnets - Potential energy - Recovery - Synchronous generators
Uncontrolled terms: Boom potential energies - Construction machinery - Control performance - Critical component - Disturbance compensation - Gain adaptive - Input and outputs - Permanent magnet generator
Classification code: 405.1 Construction Equipment - 525.3 Energy Utilization - 531 Metallurgy and Metallography - 535.1.2 Rolling Mill Practice - 632.2 Hydraulic Equipment and Machinery - 704.1 Electric Components - 705.2 Electric Generators - 705.2.1 AC Generators - 731.1 Control Systems - 931.1 Mechanics - 931.3 Atomic and Molecular Physics
DOI: 10.6041/j.issn.1000-1298.2014.11.006
Database: Compendex
10. Accession number: 20145200365910
Title: Valveless piezoelectric micropump based on Coanda effect
Authors: Yang, Song1 ; Yuan, Shouqi1 ; He, Xiuhua2 ; Cai, Shengchuan2 ; Wei, Dandan2
Author affiliation: 1 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang , China
2 School of Energy and Power Engineering, Jiangsu University, Zhenjiang , China
Corresponding author: He, Xiuhua
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 343-348
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A valveless piezoelectric micropump applying Coanda effect has been developed. The dynamic mesh method and numerical simulation were applied for studying the fluid field and performance of micropump. The results show that due to the Coanda jet, the volume efficiency η of the micropump was able to reach over 0.5 at zero pump pressure, which was larger than the traditional diffuser/nozzle valveless micropump. The effect of the flat cone tube and the concaved surface was discussed and the results show that the length of flat cone tube must be larger than dcot (θ/2), and when c2/c1=1, L1/d=9, the flowrate of micropump reaches a maximum at zero pump pressure. And the comparison of η with the different c2/c1 and pump pressures shows the large width of the concaved surface could enhance the performance of micropump at a high pump pressure, but reduce the performance of micropump at a low pump pressure. Response surface methodology was utilized to optimize the structural parameters. When the pump pressure was 5 kPa, the recommend region was 4≤ L1/d≤5 and 0.75≤c2/c1≤0.85. When L1/d=4.3 and c2/c1=0.80, the maximum volume efficiency was 0.323 and the difference was 1.89% comparing with the value of simulation which was 0.317.
Number of references: 13
Main heading: Pumps
Controlled terms: Computer simulation - Numerical methods - Numerical models - Piezoelectricity - Surface properties - Tubes (components)
Uncontrolled terms: Coanda effects - Diffuser/nozzle - Dynamic mesh method - Piezoelectric micropumps - Response surface methodology - Structural parameter - Valveless micropumps - Volume efficiency
Classification code: 616.1 Heat Exchange Equipment and Components - 618.2 Pumps - 701.1 Electricity: Basic Concepts and Phenomena - 723.5 Computer Applications - 921 Mathematics - 921.6 Numerical Methods - 951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2014.11.053
Database: Compendex
11. Accession number: 20145200366405
Title: Experiment of straight and airline flight operation for farmland based on UAV in visual remote mode
Authors: Peng, Xiaodong1 ; Zhang, Tiemin1 ; Li, Jiyu1 ; Qi, Haixia1 ; Liao, Yihua1 ; Zhuang, Xiaolin1
Author affiliation: 1 Key Laboratory of Key Technology on Agricultural Machine and Equipment, Ministry of Education, South China Agricultural University, Guangzhou , China
Corresponding author: Zhang, Tiemin
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 258-263
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To get the straight flight features of agricultural UAV (unmanned aerial vehicle), and to verify and evaluate the artificial path planning and the actual operating results in visual remote flight mode, a wireless transmission system based on GPS was designed. The handler took the straight boundary of paddy field as a reference by using remote control UAV based on visual and experience. Straight flight experiment and the real-time path planning flight experiment were implemented on the base of the paddy field boundary. The results showed that it was difficult to control the UAV flying in a straight line in visual remote control mode, and the artificial planning route deviated from the ideal flight path significantly for the reason of no reference. It was estimated that the skip rate was 17.1%, duplication operation occupied 8.2%, and outside wasted region accounted for 0.7%. Meanwhile, the height and speed of the UAV had a characteristic of erratic randomness in visual remote flight mode. Therefore, in case of no navigation, it is difficult for handler to implement precise operation by means of visual and experience alone. Autonomous flight mode with GPS navigation, intelligent optimization and generates flight trajectory, is the direction for future development of UAV applied in precision farming.
Number of references: 22
Main heading: Unmanned aerial vehicles (UAV)
Controlled terms: Agriculture - Aircraft control - Experiments - Flight paths - Global positioning system - Motion planning - Remote control - Vehicle transmissions
Uncontrolled terms: Autonomous flight - Coordinates acquisition - Flight experiments - Intelligent optimization - Route planning - UAV (unmanned aerial vehicle) - Visual remote - Wireless transmission systems
Classification code: 602.2 Mechanical Transmissions - 652 Aircraft and Avionics - 652.1 Aircraft, General - 716.3 Radio Systems and Equipment - 731.1 Control Systems - 731.5 Robotics - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 901.3 Engineering Research
DOI: 10.6041/j.issn.1000-1298.2014.11.040
Database: Compendex
12. Accession number: 20145200366383
Title: Simulation and experiment on feed ability of small sugarcane harvester
Authors: Shen, Zhonghua1 ; Li, Shangping2 ; Ma, Fanglan3 ; Gao, Jianli3
Author affiliation: 1 Light Industry and Food Engineering Institute, Guangxi University, Nanning , China
2 College of Information Science and Engineering, Guangxi University for Nationalities, Nanning, China
3 College of Mechanical Engineering, Guangxi University, Nanning , China
Corresponding author: Li, Shangping
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 117-123
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to harvest sugarcane with machine in hilly area, a small whole-stalk sugarcane harvester was designed. Virtual simulation test for cutting system was carried out using logistics simulation software FLEXSIM. The virtual test results showed that increasing the width of logistic channel and enhancing the transmission speed of the sugarcane had significant differences on avoiding blocking during sugarcane harvesting. When the width of logistic channel remained constant, enhancing the transmission speed of the sugarcane was particularly important. Then, the transmission process of the sugarcane was simulated using ADAMS software. The simulation results showed that increasing the friction coefficient between sugarcane and spiral, equipping aggressive knock-down roller and adding more rubbers on the drum could increase the transmission speed of the sugarcane. Field test indicated that the feed ability was enhanced, and the times of sugarcane struck by base-cutter and lifter were decreased. The cutting quality of sugarcane was improved, and the probability of blocking during sugarcane harvesting was reduced after taking the measures above. The time of sugarcane passing through the cutting system was shortened to 1.5 s from 2~3 s, and no damage rate of the base of sugarcane was increased from 17.8% to 57.9%.
Number of references: 14
Main heading: Software testing
Controlled terms: Blocking probability - Friction - Harvesters - Harvesting - Logistics - Virtual reality
Uncontrolled terms: Friction coefficients - Logistic systems - Logistics simulations - Probability of Blocking - Simulation - Sugarcane harvesters - Virtual simulations - Whole-stalk sugarcane harvesters
Classification code: 716 Telecommunication; Radar, Radio and Television - 717 Optical Communication - 718 Telephone Systems and Related Technologies; Line Communications - 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 821.1 Agricultural Machinery and Equipment - 821.3 Agricultural Methods - 912 Industrial Engineering and Management - 913 Production Planning and Control; Manufacturing - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2014.11.018
Database: Compendex
13. Accession number: 20145200366376
Title: Development of 6CQCL-50 multi-functional preprocessing machine for fresh tea
Authors: He, Xuejun1 ; Wang, Jin1 ; Tang, Xiaolin2 ; Lu, Guodong1 ; Wang, Bingwen1 ; Ren, Guangxin2
Author affiliation: 1 State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou , China
2 Hangzhou Tea Research Institute, China CO-OP, Hangzhou , China
Corresponding author: Wang, Jin
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 68-74
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to enrich the kind of teas being produced, and improve the utilization of fresh tea materials, a multi-functional preprocessing machine for fresh tea was developed which could realize spreading of green tea, withering of black tea, and green-making of oolong tea. The general structures as well as the working principle of some key parts like mechanical transmission system, leaf turning device, ventilation and heating system were introduced. With multi-branch pipe for air intake, the uniformity of wind field was ensured; pump with high pressure and low flow rate, together with small spray nozzle ensured the uniformity of moisture; temperature was accurately controlled according to different layers. Experimental results show that teas produced with this machine had higher physical and chemical indexes and scores compared to the control groups. The results show that the design was reasonable, and the machine was reliable.
Number of references: 12
Main heading: Air intakes
Controlled terms: Spray nozzles
Uncontrolled terms: Different layers - Fresh tea - General structures - Green-making - Mechanical transmission system - Spreading - Ventilation and heating - Withering
Classification code: 631.1 Fluid Flow, General
DOI: 10.6041/j.issn.1000-1298.2014.11.011
Database: Compendex
14. Accession number: 20145200366368
Title: Experimental research on real-time prediction method for road slope based on support vector machine
Authors: Zhang, Xiaolong1 ; Chen, Bin1 ; Song, Jian2 ; Pan, Deng1
Author affiliation: 1 School of Engineering, Anhui Agricultural University, Hefei , China
2 State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing , China
Corresponding author: Song, Jian
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 14-19
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Prediction of road slope is a key technology to vehicles' electronic real-time control system, such as ABS, AMT and hybrid torque distribution, and so on. In this paper, a real-time prediction method of road slope was put forward based on support vector machine (SVM), in which the input parameters of SVM module included engine speed, engine output torque, vehicle speed and longitudinal acceleration, and could be extracted from controller CAN network in real-time. The vehicle roadway test system and the CarSim simulation platform were built up respectively, and the samples required for SVM model learning, generalization performance test were achieved by the systematic tests. The squared correlation coefficient of SVM model from CarSim tests was 0.99, while it was 0.9 from roadway tests. The main reason for the difference could be that the GPS method in road slope test may add in a body pitch angle which could not be eliminated systematically. Furthermore, the SVM model of roadway test was imported into the real-time virtual controller PXIe using LabVIEW programming method. For the equivalent prediction time of one point to the single-chip computer selected by automotive electronic controller was only 1.33 ms, which met the requirements of real-time control. The road slope prediction method proposed in this paper is effective and practicable.
Number of references: 14
Main heading: Support vector machines
Controlled terms: Computer simulation - Controllers - Engines - Forecasting - Real time control - Roads and streets - Testing - Transportation - Vehicles
Uncontrolled terms: Electronic controllers - Experimental research - Generalization performance - Longitudinal acceleration - Real-time prediction - Road slope - Roadway tests - Squared correlation coefficients
Classification code: 406.2 Roads and Streets - 423.2 Non Mechanical Properties of Building Materials: Test Methods - 432 Highway Transportation - 612 Engines - 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 731 Automatic Control Principles and Applications - 732 Control Devices - 732.1 Control Equipment - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.11.003
Database: Compendex
15. Accession number: 20145200366373
Title: CUDA-based parallel K-means clustering algorithm
Authors: Huo, Yingqiu1 ; Qin, Renbo2 ; Xing, Caiyan2 ; Chen, Xi2 ; Fang, Yong1
Author affiliation: 1 College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling; Shaanxi , China
2 College of Information Engineering, Northwest A and F University, Yangling; Shaanxi , China
Corresponding author: Fang, Yong
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 47-53 and 74
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: K-means clustering algorithm is an excellent algorithm which has been widely used in the image processing and data mining. However, the algorithm arouses a high computational complexity. This paper made a parallel analysis of K-means algorithm in detail, and proposed a partitioning and parallel K-means algorithm based on CUDA (Compute unified device architecture). In addition, some optimization strategies, e. g., coalesced memory access, parallel reduction, load balance and instruction optimization, were discussed to obtain the higher performance. Experimental results show that the parallel K-means algorithm achieves 560x speedup over the sequential C codes, while maintains the same effect. Hence it solves the bottleneck of the algorithm perfectly, which is an attractive alternative to the sequential K-means algorithm for image segmentation and clustering analysis.
Number of references: 28
Main heading: Clustering algorithms
Controlled terms: C (programming language) - Computational complexity - Data mining - Image segmentation - Parallel architectures
Uncontrolled terms: Coalesced memory access - CUDA - CUDA (compute unified device architecture) - GPU - K-Means clustering algorithm - Optimization strategy - Parallel optimization - Segmentation and clustering
Classification code: 721 Computer Circuits and Logic Elements - 721.1 Computer Theory, Includes Formal Logic, Automata Theory, Switching Theory, Programming Theory - 722 Computer Systems and Equipment - 723 Computer Software, Data Handling and Applications
DOI: 10.6041/j.issn.1000-1298.2014.11.008
Database: Compendex
16. Accession number: 20145200366366
Title: Estimation of vehicle status parameters based on compensation adaptive control algorithm
Authors: Lin, Cheng1 ; Zhou, Fengjun1 ; Xu, Zhifeng1 ; Cao, Wanke1 ; Dong, Aidao1
Author affiliation: 1 School of Mechanical, Beijing Institute of Technology, Beijing , China
Corresponding author: Lin, Cheng
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 1-8
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Accurate estimation of vehicle status parameters is important to vehicle stability control. Combination of 3-DOF vehicle dynamics model and adaptive control algorithm, proposed a method that modifies adaptive law through compensation was proposed to estimate vehicle parameters correctly. Bases on the method, the vehicle dynamics model was simplified to reduce the calculation burden and improve the real-time performance. The starting and acceleration driving conditon and double lane change conditon were designed for the simulation and the hardware-in-loop test. Finally, both the simulation results and hardware-in-loop test results indicate that the proposed method could estimate the vehicle mass and moment of inertia more precisely and faster compared to the adaptive algorithm without compensation and satisfy the requirement of vehicle online estimation.
Number of references: 17
Main heading: Parameter estimation
Controlled terms: Adaptive algorithms - Adaptive control systems - Dynamics - Estimation - Hardware - Railroad rolling stock - Vehicles
Uncontrolled terms: Adaptive control algorithms - Double lane changes - Estimation of vehicles - Real time performance - Status parameters - Vehicle dynamics - Vehicle dynamics models - Vehicle stability control
Classification code: 432 Highway Transportation - 605 Small Tools and Hardware - 682.1 Railroad Rolling Stock, General - 731.1 Control Systems - 921 Mathematics - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2014.11.001
Database: Compendex
17. Accession number: 20145200366401
Title: Study on ultrasound-assisted extraction and properties of rice bran protein
Authors: Liu, Haifei1 ; Xiao, Zhigang1 ; Wang, Na1 ; Wang, Peng1 ; Ma, Tao2
Author affiliation: 1 College of Food Science, Northeast Agricultural University, Harbin , China
2 Food Science Research Institute, Bohai University, Jinzhou , China
Corresponding author: Xiao, Zhigang
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 235-241
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The rice bran protein was extracted using stabilized rice bran by ultrasonic combined with acid-alkali soluble. Selecting the ultrasonic time, ultrasonic power, ultrasonic temperature and solid-liquid ratio as studying factors, the yeild of rice bran albumin and rice bran glutelin were chosen for single factor experiment. Rice bran albumin and rice bran glutelin were from stabilized rice bran under the best ultrasonic conditions, which were tested amino acid composition, microstructure, secondary structure and thermal stability. The results shows that the yeild of rice bran albumin and rice bran glutelin both reach the maximal value under the condition of ultrasonic time 10 min, ultrasonic power 160 W, ultrasonic temperature 50 and liquid-solid ratio 10 mL/g. Amino acid composition, microstructure and secondary structure showed the two protein had the typical characteristics of albumin and protein, and had higher thermal stability.
Number of references: 25
Main heading: Proteins
Controlled terms: Amino acids - Extraction - Liquids - Microstructure - Thermodynamic stability - Ultrasonics
Uncontrolled terms: Amino acid compositions - Rice bran protein - Rice brans - Secondary structures - Single-factor experiments - Solid-liquid ratio - Ultrasonic power - Ultrasound-assisted extraction
Classification code: 641.1 Thermodynamics - 753.1 Ultrasonic Waves - 802.3 Chemical Operations - 804.1 Organic Compounds - 931.2 Physical Properties of Gases, Liquids and Solids - 933 Solid State Physics - 951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2014.11.036
Database: Compendex
18. Accession number: 20145200366411
Title: Design of a low-power environmental acquisition node based on dual-power structure for greenhouse
Authors: Shen, Mingxia1 ; Liu, Zheng1 ; Xiong, Yingjun1 ; Sun, Yuwen1 ; Lu, Mingzhou1 ; Liu, Longshen1
Author affiliation: 1 College of Engineering, Nanjing Agricultural University, Nanjing , China
Corresponding author: Shen, Mingxia
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 298-303
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To improve battery energy efficiency and reduce power consumption of wireless collection nodes for greenhouse environment, hardware design for Greenhouse Wireless Acquisition nodes is achieved by low-power 16-bit MCU (MSP430F149) and RF module CC1101. Power management module is designed based on chip TPS63031 to implement dual-power supply, which allows nodes' power supplied respectively by three Nanfu-AA batteries and one 3 V button battery under working and sleeping mode. And 22.8% usable energy of batteries is improved effectively by using the DC-DC conversion. FSM module is adopted to software protocol design, implementing nodes' task scheduling between working mode and sleeping mode. When the LPM3 mode is entered, node's power consumption is greatly reduced. The discharge experiment of batteries and test of nodes performance show that design of power supply scheme in this paper guarantees node work for 11 019.8 h (about 459.2 d), with the setting of 30 min acquisition cycle.
Number of references: 21
Main heading: Energy efficiency
Controlled terms: DC-DC converters - Design - Electric batteries - Greenhouses - Mergers and acquisitions - Scheduling
Uncontrolled terms: Dc-Dc conversion - Greenhouse environment - Hardware design - Power low - Power structures - Software protocols - Task-scheduling - WSNs node
Classification code: 402.1 Industrial and Agricultural Buildings - 408 Structural Design - 525.2 Energy Conservation - 702.1 Electric Batteries - 704.1 Electric Components - 912 Industrial Engineering and Management - 912.2 Management
DOI: 10.6041/j.issn.1000-1298.2014.11.046
Database: Compendex
19. Accession number: 20145200366404
Title: Study on monitoring fractional vegetation cover of garden plots by unmanned aerial vehicles
Authors: Liu, Feng1 ; Liu, Suhong2 ; Xiang, Yang2
Author affiliation: 1 College of Geomatics, Xi'an University of Science and Technology, Xi'an , China
2 School of Geography, Beijing Normal University, Beijing , China
Corresponding author: Liu, Suhong
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 250-257
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A remote sensing system based on the unmanned aerial vehicles (UAV) was designed and established. The garden plot in Beijing was selected as a research object and the major growing period of Chinese chestnut was monitored. Based on this system, the experiment monitoring for the major growing period of Chinese chestnut was achieved and a large number of high resolution images was obtained. The preprocessing including selecting, band separation and calibration and so on was made and finally three main band (red, green, near infrared) reflectance data of Chinese chestnut in the major growing period was generated. According to the analysis of difference for spectral signature between vegetation and soil in the band range of 400~1 200 nm, the ratio of total number of vegetation pixels was counted for the imaging range, that was fractional vegetation cover (FVC). The fractional vegetation cover of unmanned aerial vehicles images could be computed rapidly. The annual variation of fractional vegetation coverfor Chinese chestnut was monitored using multi-temporal unmanned aerial vehicles remote sensing images. The simulation scenes were formed by computer simulation method and the characteristic of statisticsscalefor Chinese chestnut fraction vegetation cover was analysed. The availability and effectiveness of the fractional vegetation cover computed from remote sensing images of unmanned aerial vehicles were validated.
Number of references: 33
Main heading: Unmanned aerial vehicles (UAV)
Controlled terms: Computer simulation - Fruits - Image reconstruction - Infrared devices - Monitoring - Remote sensing - Vegetation - Vehicles
Uncontrolled terms: Annual variations - Chinese chestnuts - Fractional vegetation cover - Garden plots - High resolution image - Remote sensing images - Remote sensing system - Spectral signature
Classification code: 432 Highway Transportation - 652.1 Aircraft, General - 723.5 Computer Applications - 731.1 Control Systems - 741 Light, Optics and Optical Devices - 741.3 Optical Devices and Systems - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.4 Agricultural Products - 941 Acoustical and Optical Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments
DOI: 10.6041/j.issn.1000-1298.2014.11.039
Database: Compendex
20. Accession number: 20145200366408
Title: Remote sensing inversion of nitrogen content based on SVM in processing tomato early blight leaves
Authors: Yin, Xiaojun1 ; Zhang, Qing2 ; Zhao, Qingzhan1 ; Wang, Chuanjian1 ; Ning, Chuan1
Author affiliation: 1 Institute of Information Science and Technology, Shihezi University, Shihezi , China
2 Key Laboratory of Digital Globe, Institute of Remote Sensing and Digital Earth of CAS, Beijing , China
Corresponding author: Zhang, Qing
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 280-285 and 39
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Support vector machine was used to invert nitrogen content of processing tomato early blight leaves in Xinjiang. The spectrum characteristic of processing tomato of difference disease level was analyzed. Then nitrogen content was found to be strong correlation with the spectral reflectivity on 218~357 nm, 384~587 nm, 1 033~1 141 nm, 1 499~2 500 nm, because the correlation coefficients were more than 0.8. The vegetation index, SR705, ND705, GMI-2, RI-half, and PTEBc were chosen through K-CV cross-validation, and SVM model was used to invert the nitrogen content with the vegetation index. The results show that the precision the SVM model of radial basis function kernel was the highest in linear kernel, polynomial kernel, radial basis function kernel and Sigmoid kernel. The value of MSE was 0.012 4. The value of R was 85.916%. The value of average relative error was 0.175. SVM model with multi-vegetation index improved the precision of inverting nitrogen content of processing tomato early blight leaves.
Number of references: 30
Main heading: Support vector machines
Controlled terms: Fruits - Functions - Nitrogen - Radial basis function networks - Remote sensing - Vegetation
Uncontrolled terms: Early blight - Inversion - Nitrogen content - Processing tomatoes - Spectrum indices
Classification code: 723 Computer Software, Data Handling and Applications - 723.4 Artificial Intelligence - 731.1 Control Systems - 804 Chemical Products Generally - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 821.4 Agricultural Products - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.11.043
Database: Compendex
21. Accession number: 20145200366391
Title: Distribution of farmland heavy metals and pollution assessment in mining area
Authors: Pang, Yan1 ; Tong, Yan'an1 ; Liang, Lianyou1 ; Hou, Tingyu1 ; Gao, Yimin1
Author affiliation: 1 College of Nature Resource and Environment, Northwest A and F University, Yangling; Shaanxi , China
Corresponding author: Tong, Yan'an
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 165-171
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: 130 soil samples from farmlands in Weibei dry-land mining area were collected and analyzed for the content of Cd, Cr, Cu, Pb, Zn. The results indicated that the average contents of Cd, Cu, Pb were higher than those of Shaanxi Province soil background, while Cr and Zn contents were lower than those. The geostatistical analysis results suggested that the heavy metal contents decreased from west to east, and had the highest contents all around cement factory. There were significantly positive correlation among Cd, Cr, Cu, Pb and Zn. The principal component analysis was applied to estimate the sources of heavy metals. Cd in factor 1 was associated with anthropogenic activities, whereas Cr in factor 2 was mainly controlled by parent material, Cu, Pb and Zn were affected by both two factors. The quality of soils were evaluated with pollution load index (PLI) and potential ecological risk index (PER), respectively. The results show that coal mine area was clean or slightly to moderately polluted, while the cement factory area was moderately polluted. Heavy metals in soil were ranked by pollution index as Cd, Pb, Cu, Cr, Zn.
Number of references: 36
Main heading: Copper
Controlled terms: Cadmium - Cements - Coal mines - Ecology - Farms - Lead - Metals - Pollution - Principal component analysis - Quality control - Soils - Zinc
Uncontrolled terms: Anthropogenic activity - Geostatistical analysis - Heavy metal contents - Mining areas - Pollution assessment - Pollution load indices - Positive correlations - Potential ecological risk
Classification code: 412.1 Cement - 454.2 Environmental Impact and Protection - 454.3 Ecology and Ecosystems - 483.1 Soils and Soil Mechanics - 503.1 Coal Mines - 531 Metallurgy and Metallography - 544.1 Copper - 546.1 Lead and Alloys - 546.3 Zinc and Alloys - 549.3 Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals - 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 913.3 Quality Assurance and Control - 922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2014.11.026
Database: Compendex
22. Accession number: 20145200366409
Title: Intelligent monitoring system of aquaculture parameters based on LEACH protocol
Authors: Jiang, Jianming1 ; Shi, Guodong1 ; Zhao, Dean2 ; Li, Zhengming2 ; Shi, Bing1, 2 ; Zhao, Yigang1
Author affiliation: 1 School of Information Science and Engineering, Changzhou University, Changzhou , China
2 Electronic and Information Engineering, Jiangsu University, Zhenjiang , China
Corresponding author: Shi, Guodong
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 286-291
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Low-power wireless measurement network of dissolved oxygen concentration based on LEACH (Low energy adaptive clustering hierarchy) protocol and intelligent inverter control in aquaculture were introduced. In LEACH protocol, the measured data were fused by the cluster head and then sent to the base station. As the dissolved oxygen concentration changed slowly, it was set that when changes in dissolved oxygen concentration were less than 0.1 mg/L, node was no longer send data to the cluster head in each frame. Simultaneously head node adjusted the transmission slot of each node in the frame. Sleep time of cluster head and node was extended and power consumption was reduced. When dissolved oxygen concentration was not less than 5.0 mg/L during the day, PLC controlled aerator automatically "farming water" at low speed through inverter. That fully took advantage of natural wind energy, solar energy and algae photosynthesis to improve water quality. When the dissolved oxygen concentration was less than 5.0 mg/L, fuzzy variable frequency control was used to reduce errors rapidly. When approaching the control target value, the inverter outputted stability to ensure the stable operation of the aerator motor. Statistics show that this control method saved more than 42.3% of the electricity, increased the production by 11.8% and increased the comprehensive economic gains by 41.3%.
Number of references: 16
Main heading: Dissolved oxygen
Controlled terms: Adaptive control systems - Aquaculture - Dissolution - Electric inverters - Leaching - Low power electronics - Power management (telecommunication) - Solar energy - Water quality - Wind power
Uncontrolled terms: Dissolved oxygen concentrations - Fuzzy variable - Intelligent monitoring - Intelligent monitoring systems - Inverter control - LEACH (low energy adaptive clustering hierarchy) - Low-energy adaptive clustering hierarchies - Low-power wireless
Classification code: 444 Water Resources - 445 Water Treatment - 445.2 Water Analysis - 615.2 Solar Power - 615.8 Wind Power (Before 1993, use code 611 ) - 713 Electronic Circuits - 713.5 Electronic Circuits Other Than Amplifiers, Oscillators, Modulators, Limiters, Discriminators or Mixers - 714 Electronic Components and Tubes - 715 Electronic Equipment, General Purpose and Industrial - 716 Telecommunication; Radar, Radio and Television - 717 Optical Communication - 718 Telephone Systems and Related Technologies; Line Communications - 731.1 Control Systems - 802.3 Chemical Operations - 821.3 Agricultural Methods
DOI: 10.6041/j.issn.1000-1298.2014.11.044
Database: Compendex
23. Accession number: 20145200366384
Title: Two-stage winnower cyclone separating cleaning system performance testing and optimization
Authors: Shi, Qingxiang1 ; Ma, Meng1 ; Yan, Weihong2 ; Zhou, Hao1 ; Yuan, Huajie1 ; Li, Yuhang1
Author affiliation: 1 Agricultural Engineering College, Henan University of Science and Technology, Luoyang , China
2 China SINOMACH Heavy Industry Corporation, Beijing , China
Corresponding author: Shi, Qingxiang
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 124-128
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To solve the cleaning problems of portable reaper, the cleaning system test bench was designed and the wheat was chosen as the experimental object. Air flow test without material was done and analyzed the static pressure in the two stages of pipelines. The relation among the speed of first and second level winnower and the fan can be found. The test can provide the selection scope of motion parameters for the material test. In material test, the fan speed and the first and second winnower speed were selected for test factors, and the cleaning rate for test indicator. Through orthogonal test and quadratic general rotation test, the motion parameters of wheat were found out when its cleaning rate was best and the impact of individual factor on the indicator was researched by regression equation. The best motion parameters can be found through the test: when the speed of first and second level winnower and the fan was 300 r/min, 764 r/min, 3 255 r/min, the cleaning rate would be best. This combination of parameters will apply to portable reaper cleaning systems, and provide the system the reliable movement parameters.
Number of references: 15
Main heading: Cleaning
Controlled terms: Harvesters
Uncontrolled terms: Cleaning devices - Combine harvesters - Cyclone separating cleaning systems - Individual factors - Parameter optimization - Performance testing - Regression equation - Winnower
Classification code: 802.3 Chemical Operations - 821.1 Agricultural Machinery and Equipment
DOI: 10.6041/j.issn.1000-1298.2014.11.019
Database: Compendex
24. Accession number: 20145200366385
Title: Effects of internal circulation flow on self-priming performance of flow-ejecting self-priming pump
Authors: Wang, Yang1 ; Li, Guidong1 ; Cao, Puyu1 ; Yin, Gang1 ; Cui, Yurui1 ; Li, Yacheng1
Author affiliation: 1 National Research Center of Pump, Jiangsu University, Zhenjiang , China
Corresponding author: Wang, Yang
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 129-133 and 145
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to study the gas-liquid two-phase flow during the gas-liquid mixing and separating process, a flow-ejecting self-priming pump named JETST-100 was chosed. Based on Eulerian-Eulerian multiphase flow model, the transient numerical simulation of the gas-liquid mixing and separating phenomena on the pump chamber was carried out using CFX software. The distributions of pressure, velocity and gas-liquid phases field inside the pump were obtained, and the change of the air volume fraction by monitoring the points on the gas-liquid separation chamber outlet and jet aerator inlet were analyzed. The test and simulation results show that the flow of liquid from the guide vane formed a large amount of velocity circulation. And the water of the pump chamber reduced with the large amount of water into the outlet channel. It was found that adding the reinforcing plate could prevent the generation of circulation on guide vane back, and improve the self-priming performance of the pump.
Number of references: 15
Main heading: Two phase flow
Controlled terms: Air - Air ejectors - Boiler circulation - Computer simulation - Computer software - Gases - Liquids - Mixing - Pumps - Unsteady flow
Uncontrolled terms: Gas - liquid two-phase flows - Gas liquids - Gas-liquid separation - Internal circulation flow - Reinforcing plates - Self priming pumps - Self-priming performance - Transient numerical simulation
Classification code: 614.2 Steam Power Plant Equipment and Operation - 618.2 Pumps - 618.3 Blowers and Fans - 631.1 Fluid Flow, General - 723 Computer Software, Data Handling and Applications - 723.5 Computer Applications - 802.3 Chemical Operations - 804 Chemical Products Generally - 931.2 Physical Properties of Gases, Liquids and Solids
DOI: 10.6041/j.issn.1000-1298.2014.11.020
Database: Compendex
25. Accession number: 20145200366400
Title: Effects of environmental factors on biofilm formation by lactobacillus pentosus
Authors: Ren, Xiaopu1 ; Tuo, Yanfeng2 ; Li, Mingyang1 ; Wang, Lei1 ; Yao, Dongqin1
Author affiliation: 1 Production and Construction Group Key Laboratory of Special Agricultural Products Further Processing in Southern Xinjiang, Tarim University, Alar , China
2 College of Food Science and Technology, Dalian Polytechnic University, Dalian , China
Corresponding author: Ren, Xiaopu
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 230-234 and 229
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Lactic acid bacteria (LAB) are recognized as probiotics worldwide. The cell itself and all kinds of metabolites are essential parts of the human life processes. The bacterial biofilm has been described as sessile bacterial communities that attached to surfaces aggregating in a hydrated polymeric matrix of their own synthesis. LAB biofilm has broad perspective for their particularities. Lactobacillus pentosus, which isolated from the traditional dairy products of Xinjiang and had a strong positive biofilm formation, was taken as the research subjects. Semi-quantitative assay was performed to examine effects of different physical and chemical factors and several food additives on biofilm formation by L. pentosus. The results showed that the optimum physical and chemical conditions for biofilm formation of L. pentosus were inoculation volume at 1200, incubation temperature at 37, culture period at 48 h, glucose concentration at 2%, pH value at 5.8~6.8, and so on. The addition of Ca2 and lactic acid obviously inhibited biofilm formation by L. pentosus completely.
Number of references: 14
Main heading: Biofilms
Controlled terms: Bacteria - Food additives - Lactic acid
Uncontrolled terms: Bacterial community - Chemical conditions - Chemical factors - Environmental factors - Glucose concentration - Incubation temperatures - Lactic acid bacteria - Quantitative assay
Classification code: 461.9 Biology - 462.5 Biomaterials (including synthetics) - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally - 804.1 Organic Compounds
DOI: 10.6041/j.issn.1000-1298.2014.11.035
Database: Compendex
26. Accession number: 20145200366407
Title: Crop NPP inversion using surface energy balance algorithm for land model
Authors: Su, Wei1, 2 ; Liu, Rui1 ; Sun, Zhongping3 ; Liu, Ting1 ; Jiang, Fangfang1 ; Cao, Fei3
Author affiliation: 1 College of Information and Electrical Engineering, China Agricultural University, Beijing , China
2 Key Laboratory of Agri-informatics, Ministry of Agriculture, Beijing , China
3 Satellite Environment Center, Ministry of Environmental Protection, Beijing , China
Corresponding author: Sun, Zhongping
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 272-279
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The crop net primary productivity is inversion using HJ-1 CCD and IRS remote sensing images in Zhuozhou and Gaobeidian, Baoding City, Hebei Province. This inversion is done based on surface energy balance algorithm for land model. There are two important components in this inversion process: efficiency for solar energy utilization and absorbed photosynthetic active radiation (APAR). Firstly, HJ-1 CCD and IRS remote sensing images, DEM, meteorological data are used to estimate net radiation flux, soil heat flux, sensible heat flux to the air. These three fluxes are used to compute instantaneous evaporative fraction, which is used to inversion efficiency for solar energy utilization. Secondly, extraterrestrial radiation is computed using DEM. At the same time, crop absorbed photosynthetic active radiation is computes based on the fraction of photosynthetically active radiation (fPAR). And the fPAR is computed using normalized difference vegetation index and spectral ratio index resulting from HJ-1 CCD remote sensing images. At last, the inversion APAR and efficiency for solar energy utilization are used to estimate crop net primary productivity. Experiment results indicate that the inversion result of 24 hour actual evapotranspiration is from 4.43 mm/d to 8.18 mm/d, mean value of which is 6.28 mm/d. This value is close to 7.15 mm/d, which is the computed result using Penman-Monteith formula. This indicates our inversion accuracy can meet our application requirements. The mean value of crop NPP 31.02 g · m-2 · d-1, the highest value is 139.29 g · m-2 · d-1, the spatial pattern is same to land cover type. These indicate that this study is reasonable and feasible.
Number of references: 19
Main heading: Energy efficiency
Controlled terms: Algorithms - Crops - Ecosystems - Energy balance - Energy utilization - Evapotranspiration - Heat flux - Image reconstruction - Interfacial energy - Mathematical models - Meteorology - Photosynthesis - Phytoplankton - Radiation - Remote sensing - Solar energy
Uncontrolled terms: Actual evapotranspiration - Fraction of photosynthetically active radiations - Inversion - Net primary productivity - Normalized difference vegetation index - Photosynthetic active radiations - Photosynthetically available radiations - Surface energy balance algorithm for lands
Classification code: 443 Meteorology - 444.1 Surface Water - 454.3 Ecology and Ecosystems - 471 Marine Science and Oceanography - 525.2 Energy Conservation - 525.3 Energy Utilization - 615.2 Solar Power - 641.2 Heat Transfer - 711 Electromagnetic Waves - 731.1 Control Systems - 741 Light, Optics and Optical Devices - 741.1 Light/Optics - 821.4 Agricultural Products - 921 Mathematics - 931 Classical Physics; Quantum Theory; Relativity - 931.2 Physical Properties of Gases, Liquids and Solids
DOI: 10.6041/j.issn.1000-1298.2014.11.042
Database: Compendex
27. Accession number: 20145200366413
Title: Evaluation of ventilation performance of greenhouse fans based on fans assessment numeration system
Authors: Zhang, Zhi1 ; Ford Steven, E.2 ; Gates Richard, S.2 ; Zou, Zhirong3
Author affiliation: 1 College of Mechanical and Electronic Engineering, Northwest A and F University, Yangling; Shaanxi, China
2 Department of Agriculture and Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, United States
3 College of Horticulture, Northwest A and F University, Yangling; Shaanxi , China
Corresponding author: Zou, Zhirong
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 311-316
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Fans assessment numeration system (FANS) was taking for testing the ventilation for each fan at the range of static pressures from 5.0 Pa to 61.5 Pa under different operating conditions. The results suggested that the existence and cleanliness of the fan safety guard reduced ventilation by less than 5%. The ventilation and efficiency of fans fitted with plastic shutters were 13.1% and 15.1% higher than the fans with aluminum shutters. The most difference of fans efficiency with same parameters reached to 12.7%. The average ventilation was reduced by 38.7% when the rotational speed drove by belt reduced by 16.1%. The energy consumption significantly increased when static pressure was more than 30 Pa.
Number of references: 23
Main heading: Ventilation
Controlled terms: Efficiency - Energy utilization - Greenhouses - Number theory
Uncontrolled terms: Air flow - Different operating conditions - Fan performance - Numeration systems - Rotational speed - Safety guards - Static pressure - Ventilation performance
Classification code: 402.1 Industrial and Agricultural Buildings - 525.3 Energy Utilization - 643.5 Ventilation - 913.1 Production Engineering - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.11.048
Database: Compendex
28. Accession number: 20145200366379
Title: High strength structural design and influence test for rice seedling-growing bowl tray made of paddy-straw
Authors: Li, Lianhao1, 2 ; Zhang, Wei1 ; Wang, Chun1 ; Zhang, Xinyue1
Author affiliation: 1 College of Engineering, Heilongjiang Bayi Agricultural University, Daqing , China
2 College of Water and Civil Engineering, China Agricultural University, Beijing , China
Corresponding author: Zhang, Wei
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 88-97
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to solve the problems of rice seedling-growing bowl tray made of paddy-straw in the process of application, the improved structural design was made for the early rice seedling-growing bowl tray made of paddy-straw. The paper explored its structural design principle and design process. Compared with the early rice seedling-growing bowl tray made of paddy-straw (CK1), rice bowl carrier of Japanese (CK2) and actual rice production of China (CK3), the paper discussed influence on rice production by field test with rice seedling-growing bowl tray made of paddy-straw after improvement (CK). The results with CK, CK1, CK2 and CK3 as rice seedling carrier respectively showed that: the max normal stress of CK was higher than that of CK1. The seedling with CK and CK1 need not slow growth days, but the seedling with CK2 and CK3 slow growth days when they were transplanted in rice field. Rice-seedling qualities was not significantly different between CK and CK1, but which were better than CK2 and CK3. Cost of production of CK was smaller than that of CK1and CK2, but higher that of CK3. Influence of CK and CK1 on organic matter in soil profile was the same. At the soil level of 0~10 cm, 10~20 cm and 20~30 cm, the organic matter in soil profile of CK were 7.06%, 10.08%, 2.53%, 3.34%, 0.48% and 0.11% higher than that of CK2 and CK3 respectively. Influence of CK and CK1 on dynamics of soil bulk densities was the same. Compared with CK2 and CK3, the CK could enable to reduce dynamics of soil bulk densities. The rice yield of CK was the same to that of CK1. Compared with CK2 and CK3, rice yield of CK was higher than by 10.59% and 13.54% respectively, which benefits to develop others bowl cultivation technology in China.
Number of references: 17
Main heading: Cultivation
Controlled terms: Biogeochemistry - Biological materials - Organic compounds - Soils - Structural design
Uncontrolled terms: Cost of productions - Design process - High strength - Rice - Rice production - Rice seedlings - Seedling quality - Soil bulk density
Classification code: 408.1 Structural Design, General - 461.2 Biological Materials and Tissue Engineering - 481.2 Geochemistry - 483.1 Soils and Soil Mechanics - 804.1 Organic Compounds - 821.3 Agricultural Methods
DOI: 10.6041/j.issn.1000-1298.2014.11.014
Database: Compendex
29. Accession number: 20145200366387
Title: Experimental investigation of pressure fluctuation with multiple flow rates in scaled axial flow pump
Authors: Zhang, Desheng1 ; Wang, Haiyu1 ; Shi, Weidong1 ; Pan, Dazhi1 ; Shao, Peipei1
Author affiliation: 1 Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang , China
Corresponding author: Zhang, Desheng
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 139-145
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to discuss the characteristics of pressure fluctuation in a scaled axial flow pump at different flow rate conditions, the dynamic pressure fluctuation data of six pressure monitoring points on the pump casing was measured at different flow rates, and the law of pressure fluctuation in impeller was revealed. The experimental results show that waveform of pressure fluctuation at impeller inlet P1 was the normal sine shape, and the peak to peak value of pressure fluctuation at the measuring point P2 in the impeller reached the maximum, and then decreased at monitoring point P1 located in impeller inlet. Time domains of pressure fluctuations in impeller had four peaks and four valleys which were consistent with the impeller blade number, due to the alternating pressure gradient. The secondary flow and tip leakage vortex induced the second harmonic wave significantly at the middle of impeller at small flow rate conditions. Based on Fast Fourier Transform, the main frequencies of pressure fluctuations at three measuring points in the impeller region in different flow rate conditions were all blade passing frequency (BPF), and the harmonic frequency was the multiples of BPF. The amplitudes of harmonic frequency decayed exponentially. However, the low frequency which was induced by the reversed flow and flushing occured in the frequency domain of pressure fluctuations in the guide vane, and the BPF and its harmonics coexisted.
Number of references: 18
Main heading: Flow rate
Controlled terms: Axial flow - Experiments - Fast Fourier transforms - Frequency domain analysis - Harmonic analysis - Impellers - Leakage (fluid)
Uncontrolled terms: Axial flow pump - Blade passing frequency - Harmonic - Multi-conditions - Pressure fluctuation
Classification code: 452.3 Industrial Wastes - 601.2 Machine Components - 631 Fluid Flow - 631.1 Fluid Flow, General - 901.3 Engineering Research - 921.3 Mathematical Transformations - 921.6 Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2014.11.022
Database: Compendex
30. Accession number: 20145200366397
Title: Pitch angle control for wind turbine based on constant pressure network and hydraulic motor with variable displacement
Authors: Yin, Xiuxing1 ; Lin, Yonggang1 ; Li, Wei1 ; Wang, Chengdong1 ; Liu, Hongwei1 ; Gu, Yajing1
Author affiliation: 1 The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou , China
Corresponding author: Lin, Yonggang
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 206-211
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A novel pitch control system is proposed for wind turbine to stabilize the drive-train power and torque fluctuations. This system is based on a constant pressure network and a hydraulic motor with variable displacement. The desired pitch control motions and directions can be achieved by regulating the displacement of the hydraulic motor to adapt to the varying loads acting on the blade. Mathematical model and a detailed analysis for the control characteristics of the system are provided. Further, a double control loop for position feedback is proposed to accurately track the desired pitch angle which is obtained based on fuzzy reasoning. Experimental results have demonstrated that this system can effectively control the power and driver torque, and consequently maintain the output power and torque on the rated values. In addition, this novel system has the advantages of high power versus volume, energy-saving and is particularly suitable for large scaled individual pitch controlled wind turbine.
Number of references: 17
Main heading: Hydraulic motors
Controlled terms: Energy conservation - Mathematical models - Position control - Wind turbines
Uncontrolled terms: Constant pressure network - Control characteristics - Double feedback - Pitch control system - Pitch-angle control - Position feedback - Torque fluctuation - Variable displacement
Classification code: 525.2 Energy Conservation - 615.8 Wind Power (Before 1993, use code 611 ) - 632.2 Hydraulic Equipment and Machinery - 731.3 Specific Variables Control - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.11.032
Database: Compendex
31. Accession number: 20145200366393
Title: Spatial variability of cotton field salinity under mulched drip irrigation with brackish and fresh water
Authors: Li, Xianwen1 ; Jin, Menggui1
Author affiliation: 1 School of Environmental Studies, China University of Geosciences, Wuhan , China
Corresponding author: Jin, Menggui
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 180-187
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Shallow brackish water is widely distributed throughout north and northwest China and could be rational used. To evaluate the spatial distribution and variability of cotton field salinity under mulched drip irrigation with brackish and fresh water in southern Xinjiang, electromagnetic induction EM38-MK2 was applied to measure the apparent soil electrical conductivity. Statistical characteristics of soil salinity from the interpretation models of soil salinity showed that the scenario of brackish water irrigation had the higher salinity level and the lower variation coefficient than the fresh water irrigation. The optimal semi-variance models of brackish water and fresh water irrigation were exponential and Gaussian models respectively. Both models were characterized by strong spatial correlation. Compared with fresh water irrigation, the scenario of brackish water irrigation with the higher salinity level had the lager range variation and increased the spatial dependency of soil salinity. The spatial distribution of field salinity interpolated by Kriging method showed that both scenarios of brackish and fresh water irrigation had some filed parts with high salinity level, which would affect cotton emergence. EM38-MK2 would be suggested to investigate the field salinity distribution. According to soil salinity levels of different parts, amount of fresh water of flood irrigation for leaching salinity could be defined to save water and ensure the agriculture production.
Number of references: 26
Main heading: Soil surveys
Controlled terms: Arid regions - Cotton - Electromagnetic induction - Irrigation - Soils - Spatial distribution - Water
Uncontrolled terms: Agriculture productions - Apparent soil electrical conductivities - Brackish water - Mulched drip irrigations - Salinity distributions - Spatial variability - Statistical characteristics - Variance function
Classification code: 443 Meteorology - 444 Water Resources - 483.1 Soils and Soil Mechanics - 701.1 Electricity: Basic Concepts and Phenomena - 821.3 Agricultural Methods - 821.4 Agricultural Products - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.11.028
Database: Compendex
32. Accession number: 20145200366378
Title: Granular multi-flows fertilization process simulation and tube structure optimization in nutrient proportion of variable rate fertilization
Authors: Yuan, Jin1, 2 ; Liu, Qinhua1 ; Liu, Xuemei1, 2 ; Zhang, Teng1 ; Zhang, Xiaohui1
Author affiliation: 1 School of Mechanical and Electronic Engineering, Shandong Agricultural University, Taian , China
2 Shandong Provincial Key Laboratory of Horticultural Machinery and Equipment, Taian , China
Corresponding author: Yuan, Jin
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 81-87
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The structures of fertilizer tube and fertilizer falling tube have an important impact on the granular multi-fertilizer flows blending and fertilizing hysteresis performance in the nutrient proportion of variable rate technology (NPVRT). On the basis of the optimal structure of the blending cavity structure, the granular multi-fertilizer variable rate fertilizing process was simulated by discrete element method in this paper, and the impact on particles motion under varied height of fertilizing tube and varied diameter of triangular shape of the bellows was analyzed. According to the proposed performance evaluation indexes, the structures of fertilizing tube and bellows were optimized. The computing and mechanism analysis results show that: first, the greater height of fertilizer tube was, the higher particles speed in falling, collision, mixing and the various stages were. Second, the greater the spread area after the particles colliding with the blending cavity was, the better the particles blending was, and the smaller the standard deviation of particle blending ratio was. Then, the height of triangular shape of the bellows for fertilizer dropping was in range of 4~6 mm, relative to the non-bellows one, that could raise the number of collisions among the particles and bellows, thus improving the uniformity of particles blending. However, excessive height slowed down the dropping particles contacted with bellows. If the height of triangular shape of the bellows was about 2 mm, that was approximately 40% to 60% the diameter of fertilizer particle, the uniformity blending of particles could be promoted, and triangular shape had smaller effect on time-lagging of particles.
Number of references: 17
Main heading: Particles (particulate matter)
Controlled terms: Bellows - Blending - Fertilizers - Finite difference method - Nutrients - Structural optimization - Tubes (components)
Uncontrolled terms: Hysteresis performance - Mechanism analysis - Optimal structures - Process simulations - Standard deviation - Structure optimization - Variable rate fertilization - Variable rate technology
Classification code: 601.2 Machine Components - 616.1 Heat Exchange Equipment and Components - 802.3 Chemical Operations - 804 Chemical Products Generally - 821.2 Agricultural Chemicals - 921.5 Optimization Techniques - 921.6 Numerical Methods - 951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2014.11.013
Database: Compendex
33. Accession number: 20145200366403
Title: Temperature prediction of yam under infrared drying based on neural networks
Authors: Zhang, Lili1, 2 ; Wang, Xiangyou2 ; Zhang, Haipeng2
Author affiliation: 1 College of Engineering, China Agricultural University, Beijing , China
2 School of Agriculture and Food Engineering, Shandong University of Technology, Zibo , China
Corresponding author: Wang, Xiangyou
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 246-249 and 336
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Infrared drying experiments were carried out and the temperature data of yam were collected under different infrared intensities and infrared distances. The experiment results showed that the infrared intensity, infrared distance and drying time played an important role on the surface temperature and internal temperature of yam. Thus, infrared intensity, infrared distance and drying time were chosen as the input layers vectors of BP neural network model. A 3× 9× 1 single hidden layer BP network model was established. The model was trained by steepest gradient descent method and Levenberg-Marquardt algorithm respectively based on temperature data of yam. The maximum prediction error of optimized network model using Levenberg-Marquardt algorithm was 1.3, while the traditional algorithm of BP neural network was 5.7. It was indicated that Levenberg-Marquardt optimization method was superior to the steepest gradient descent method in the predicting temperature of yam with high precision. Therefore, it is feasible to predict temperature variations of materials during infrared drying process by using BP neural network model optimized by L-M algorithm.
Number of references: 12
Main heading: Infrared drying
Controlled terms: Algorithms - Atmospheric temperature - Experiments - Forecasting - Network layers - Neural networks - Optimization - Steepest descent method - Temperature
Uncontrolled terms: BP neural network model - Gradient Descent method - Internal temperature - Levenberg-Marquardt algorithm - Levenberg-Marquardt optimization - Surface temperatures - Temperature prediction - Temperature variation
Classification code: 443.1 Atmospheric Properties - 641.1 Thermodynamics - 642.1 Process Heating - 723 Computer Software, Data Handling and Applications - 723.4 Artificial Intelligence - 901.3 Engineering Research - 921 Mathematics - 921.5 Optimization Techniques
DOI: 10.6041/j.issn.1000-1298.2014.11.038
Database: Compendex
34. Accession number: 20145200366395
Title: Effect of sludge return crack width on separation efficiency of three-phase separator in UASB reactor
Authors: Hao, Feilin1 ; Shen, Mingwei2 ; He, Yong2 ; Feng, Lei2
Author affiliation: 1 College of Biology and Environmental Engineering, Zhejiang Shuren University, Hangzhou , China
2 College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou , China
Corresponding author: Shen, Mingwei
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 194-200
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The crack width of sludge return crack for the three-phase separator (TS) plays a key role in the separation process. To evaluate the effects of crack width on the separation efficiency of solid, liquid, gas in TS of USAB reactor, a 3-D CFD simulation was adopted based on Eulerian multi-phase model. Five typical crack width settings as 80 mm, 95 mm, 110 mm, 125 mm, 140 mm were investigated for a typical UASB reactor. The result shows that the average flow speed of three phases in the TS region was much higher than the UASB's designed up-flow speed, and the flow speed of solid phase exceeded that of gas and liquid. Circulation pattern turbulence dominated the liquid flow in TS region. The crack width had more obvious effect on solid phase than on gas and liquid. The separation efficiency was much effective for solid phase in five cases through one platewhile only 60% for gas. The separation efficiency of gas and solid phases became lower with a wider crack gap. With the supplement of precipitation layer in the top of TS, the solid phase could separate completely, while the highest separation efficiency for gas was obtained with gap width of 95 mm.
Number of references: 22
Main heading: Cracks
Controlled terms: Computational fluid dynamics - Computer simulation - Efficiency - Gases - Liquids - Precipitation (chemical) - Separators
Uncontrolled terms: Anaerobic - Circulation patterns - Crack width - Multiphase model - Phase separators - Separation efficiency - Separation process - Simulation
Classification code: 421 Strength of Building Materials; Mechanical Properties - 723.5 Computer Applications - 802.1 Chemical Plants and Equipment - 802.3 Chemical Operations - 913.1 Production Engineering - 931.2 Physical Properties of Gases, Liquids and Solids
DOI: 10.6041/j.issn.1000-1298.2014.11.030
Database: Compendex
35. Accession number: 20145200366369
Title: Study of a self-excited and liquid-cooled electromagnetic retarder
Authors: Zhang, Kai1 ; Li, Desheng1 ; Zheng, Ran1 ; Yin, Wanglei1
Author affiliation: 1 College of Mechanical Engineering and Applied Electronic Technology, Beijing University of Technology, Beijing , China
Corresponding author: Li, Desheng
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 20-26
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to overcome the complicated structure and high prices of the hydraulic retarder and the serious thermal recession problem of braking torque of the conventional eddy current brake, a self-excited and liquid-cooled eddy current retarder (SL-ECR) structure was proposed. The model of braking system and generating system of the SL-ECR was established and the magnetic circuit structure was analyzed. The electromagnetic field model, the braking performance and thermal field of the SL-ECR were analyzed by using finite element method. A 2000 N·m SL-ECR was produced and tested. The braking performance and the generator performance were tested. The results show that the difference between the finite element analysis results and the experiment results was 6%. The temperature of the water wipe was 85 when the braking power was 180 kW. The braking torque decreased by 10.4% in the continuous braking stage. The braking torque could reach 2 000 N·m when the speed was 1 500 r/min and the coil current was 30 A, while the excitation power was only 720 W by the vehicle.
Number of references: 16
Main heading: Braking performance
Controlled terms: Eddy current testing - Electromagnetic fields - Finite element method - Liquids
Uncontrolled terms: Complicated structures - Eddy current brakes - Eddy current retarder - Electromagnetic field modeling - Electromagnetic retarder - Magnetic circuit structures - Retarder - Self - excited
Classification code: 663.1 Heavy Duty Motor Vehicles - 701 Electricity and Magnetism - 701.1 Electricity: Basic Concepts and Phenomena - 921.6 Numerical Methods - 931.2 Physical Properties of Gases, Liquids and Solids
DOI: 10.6041/j.issn.1000-1298.2014.11.004
Database: Compendex
36. Accession number: 20145200366381
Title: Experimental investigation of droplet diameter and velocity distributions in air-assist boom sprays
Authors: Yan, Mingde1 ; Jia, Weidong1 ; Mao, Hanping1 ; Dong, Xiang2 ; Chen, Long1
Author affiliation: 1 Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang , China
2 State Key Laboratory of Soil-Plant-Machinery System Technology, Chinese Academy of Agricultural Mechanization Sciences, Beijing , China
Corresponding author: Jia, Weidong
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 104-110
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to study the effect on air flow rate of air-assisted and the distance of air outlet to nozzle to the droplet diameter and droplet velocity, the air-assist boom spray field was tested and analyzed in various conditions using PDPA measurement system. According to the test results, the droplet diameter distributions, velocity distributions and the relationship between air pressure and droplet diameter were analyzed systematically. The test results indicate that under the influences of flow field, the higher the air flow rate of air-assisted is, the smaller the droplet diameter is, increasing the droplet deposition, reducing the droplet drift. And its distributions are more symmetrical. The closer distance between the air outlet to the nozzle, the better droplet penetration is, reducing the trend of droplet drift.
Number of references: 15
Main heading: Spray nozzles
Controlled terms: Air - Atmospheric pressure - Drops - Flow fields - Flow rate - Velocity - Velocity distribution
Uncontrolled terms: Air-assist - Droplet deposition - Droplet diameters - Droplet sizes - Droplet velocity - Experimental investigations - Measurement system - Spray flow
Classification code: 443.1 Atmospheric Properties - 631 Fluid Flow - 631.1 Fluid Flow, General - 804 Chemical Products Generally - 931.1 Mechanics - 931.3 Atomic and Molecular Physics
DOI: 10.6041/j.issn.1000-1298.2014.11.016
Database: Compendex
37. Accession number: 20145200366399
Title: Extraction technology of antioxidants from clove based on simultaneous ultrasonic/microwave assisted extraction
Authors: Liu, Changjin1, 2 ; Zhao, Jin1, 2 ; Jiang, Shenhua3 ; Wang, Huang4 ; Liao, Liang3 ; Zhang, Xiaogu3
Author affiliation: 1 College of Food Engineering and Biotechnology, Tianjin University of Science and Technology, Tianjin , China
2 Key Laboratory of Food Nutrition and Safety, Ministry of Education, Tianjin University of Science and Technology, Tianjin , China
3 College of Life Science, Jiujiang University, Jiujiang , China
4 Library, Jiujiang University, Jiujiang , China
Corresponding author: Jiang, Shenhua
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 223-229
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The simultaneous ultrasonic/microwave assisted extraction (UMAE) technology of extracting antioxidants from clove was optimized and the reason for high-efficiency of this method was analyzed. The results show that the optimal parameters of the UMAE technology were as follows, ethanol concentration was 50%, ratio of extracting solution to sample was 30 mL/g, ultrasonic power was 50 W, the microwave power was 100 W and the extracting time was 12 min. Comparative study show that the extraction ratio of antioxidants from clove by UMAE was significantly improved compared with water bath oscillator extraction (WBOE) in the same conditions. It was also found that the superiority of UMAE was simultaneously acted and mutually reinforced by ultrasonic and microwave through interaction analysis. A comparison of scanning electron microscopy images from the clove powders by UMAE, WBOE, microwave assisted extraction (MAE) and ultrasonic assisted extraction (UAE) indicated the extraction efficiency was higher by UMEA with the more serious disruption of cell structure and the more sufficient interaction.
Number of references: 21
Main heading: Extraction
Controlled terms: Antioxidants - Scanning electron microscopy
Uncontrolled terms: Assisted extractions - Clove - Ethanol concentrations - Extraction efficiencies - Microwave-assisted extraction - Scanning electron microscopy image - Ultrasonic and microwaves - Ultrasonic-assisted extractions
Classification code: 741.1 Light/Optics - 802.3 Chemical Operations - 803 Chemical Agents and Basic Industrial Chemicals - 804 Chemical Products Generally
DOI: 10.6041/j.issn.1000-1298.2014.11.034
Database: Compendex
38. Accession number: 20145200366412
Title: Unsteady temperature simulation under variable boundary conditions for Venlo type greenhouse
Authors: Zhou, Wei1, 2 ; Wang, Xiaochan1 ; Li, Yongbo1
Author affiliation: 1 College of Engineering, Nanjing Agricultural University, Nanjing , China
2 Mechenical and Transportation Institute, Xinjiang Agricultural University, Urumchi , China
Corresponding author: Wang, Xiaochan
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 304-310
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: 3-D unsteady mathematical model of natural ventilation condition in Venlo type greenhouse was built up by CFD method. The boundary conditions were based on solar radiation, external air temperature, wind velocity and direction changing over time. The result shows that the inside temperature change had the same variation tendency with the outside temperature change during the whole simulation period. The mean temperature difference of the indoor and outdoor temperature was 3.09. RMSE of the simulated and measured value was 0.688. The maximum relative error and the average relative error was 8.9% and 2.8%, respectively. The CFD-based model could accurately represent the temporal and spatial variation of indoor temperature. When the outside wind speed changed from 0.81 m/s to 1.2 m/s and the wind direction changed from south-southwest to west, the local airspeed near the west windward entrance firstly increased and then decreased. The airflow speed in the east area was markedly increased. The average temperature of x=1.5 m cross section at the entrance of ventilation and crop canopy dropped 1.87 and 0.92 in 180 s. Cooling effect of natural ventilation was remarkably affected by wind speed and direction.
Number of references: 14
Main heading: Ventilation
Controlled terms: Air - Atmospheric temperature - Boundary conditions - Greenhouses - Mathematical models - Space heating - Sun - Temperature distribution - Wind
Uncontrolled terms: Average relative error - Maximum relative errors - Temporal and spatial variation - Unsteady cfd - Unsteady temperatures - Variable boundary conditions - Wind speed and directions - Wind velocity and direction
Classification code: 402.1 Industrial and Agricultural Buildings - 443.1 Atmospheric Properties - 641.1 Thermodynamics - 643.1 Space Heating - 643.5 Ventilation - 657.2 Extraterrestrial Physics and Stellar Phenomena - 804 Chemical Products Generally - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.11.047
Database: Compendex
39. Accession number: 20145200366402
Title: Determination of total flavonoid content distribution on different color Ginkgo biloba leaves
Authors: Shi, Jiyong1 ; Zou, Xiaobo1 ; Zhang, Detao1 ; Chen, Zhengwei1 ; Zhao, Jiewen1
Author affiliation: 1 School of Food and Biological Engineering, Jiangsu University, Zhenjiang , China
Corresponding author: Zou, Xiaobo
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 242-245 and 33
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Hyperspectral imaging technology was used to determine total flavonoid content distribution map on different color ginkgo biloba leaves (green, green-yellowish, yellow). Firstly, 120 Ginkgo biloba leaves were used to collect hyperspectral image data cube and determine total flavonoids concentrations. Secondly, the average gray value of each band in hyperspectral image data cube was calculated as spectal data of Ginkgo biloba leaf. The spectal data and total flavonoids concentrations were used to bulid calibration model (R=0.930 7) by using multiple stepwise regression method. Finaly, the calibration model was used to predict the total flavonoid content of each pixel in the hyperspectral image. This enables construction of a distribution map of total flavonoid content on the ginkgo leave. Distribution maps of total flavonoid content in three color groups (green, green-yellowish, yellow) were calculated. Results indicate that the level of total flavonoid for green, green-yellowish, and yellow were in an increasing order. Higher level of total flavonoids could be noticed at the margin area of the leaves, while lower levels occured at the area near the leafstalk of the ginkgo leaves. This research provided a method to determine major constituent of food and agricultural products.
Number of references: 14
Main heading: Spectroscopy
Controlled terms: Agricultural products - Chemical analysis - Color - Flavonoids - Imaging techniques - Regression analysis
Uncontrolled terms: Calibration model - Ginkgo biloba - Ginkgobiloba leaves - Hyper-spectral images - Hyperspectral image datas - Hyperspectral imaging technologies - Multiple stepwise regression - Total flavonoid contents
Classification code: 741 Light, Optics and Optical Devices - 741.1 Light/Optics - 746 Imaging Techniques - 801 Chemistry - 804 Chemical Products Generally - 804.1 Organic Compounds - 821.4 Agricultural Products - 922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2014.11.037
Database: Compendex
40. Accession number: 20145200366380
Title: On-line mixing pesticide device based on flow control valve and neural network
Authors: Li, Jinyang1 ; Jia, Weidong1 ; Wei, Xinhua1
Author affiliation: 1 Key Laboratory of Modern Agricultural Equipment and Techenology, Ministry of Education, Jiangsu University, Zhenjiang , China
Corresponding author: Li, Jinyang
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 98-103
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Small flow high precision real-time dynamic detection and control of pesticide is a key problem which need to solve urgently for on-line mixing device. Flow rate passing the flow regulating valve is related to differential pressure between the upstream and downstream of the valve, fluid density and the valve opening. By developing the relation expression between flow rate and these three variables, real-time detection and control for pesticide flow rate can be implemented using the control valve. In order to meter and control the flow rate of water and pesticide by using flow meter and control valve respectively, the online mixing pesticide device is designed. The calibration method of control valve is proposed and the flow rate relation expressions are developed. The experiments are conducted for the designed mixing device. The experimental results show that the relative error of the pesticide flow rate is less than 4% as the pesticide flow rate is between 24 mL/min and 240 mL/min.
Number of references: 18
Main heading: Pesticides
Controlled terms: Chemical industry - Flow control - Flow rate - Mixing - Neural networks - Rivers - Safety valves - Social networking (online) - Spraying
Uncontrolled terms: Calibration method - Differential pressures - Flow control valves - On-line mixing - Real-time detection - Real-time dynamics - Relation expression - Relative errors
Classification code: 407.2 Waterways - 631 Fluid Flow - 631.1 Fluid Flow, General - 723 Computer Software, Data Handling and Applications - 723.4 Artificial Intelligence - 802.3 Chemical Operations - 803 Chemical Agents and Basic Industrial Chemicals - 805 Chemical Engineering, General - 813.1 Coating Techniques - 914.1 Accidents and Accident Prevention
DOI: 10.6041/j.issn.1000-1298.2014.11.015
Database: Compendex
41. Accession number: 20145200366392
Title: Spatial interpolation analysis of spring wheat evapotranspiration measurements in northwest china
Authors: Wang, Chunmei1 ; Meng, Qingyan1 ; Zhan, Yulin1 ; Liu, Miao1 ; Wang, Liang2 ; Jancso, Tamas3
Author affiliation: 1 The Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing , China
2 University of Chinese Academy of Sciences, Beijing, China
3 Faculty of Geoinformatics, University of West Hungary, Sopron , Hungary
Corresponding author: Meng, Qingyan
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 172-179
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The study investigated spatial variability of spring wheat ET and uses regression analysis to identify the ET main factors. Furthermore, the ET main factors were taken into account in the ET space research. Results showed that the geo-spatial coefficients of variation of spring wheat ET ranged from 0.328 to 0.495 at various growing stages even for homogeneous farm fields. During the spring wheat growing season, the spatial variability of cumulative ET estimates was high at the tillering-shooting stage, and then reduced at the shooting-heading stage. Comparing to leaf area index (LAI), spring wheat ET had a significant relationship with surface soil moisture content change at all the growing stages. When the rainfall infiltration depth was less than 20 cm, the soil moisture (0~20 cm) was the ET main factor. Compared with the ground-based observations, the ET estimation precision with 42 ET ground sample data was better than 90%.
Number of references: 32
Main heading: Soil moisture
Controlled terms: Evapotranspiration - Interpolation - Rain - Regression analysis - Space research
Uncontrolled terms: Coefficients of variations - Estimation precision - Geo-statistics - Ground-based observations - Rainfall infiltration - Spatial interpolation analysis - Surface soil moisture - Wheat
Classification code: 443.3 Precipitation - 444.1 Surface Water - 483.1 Soils and Soil Mechanics - 656.2 Space Research - 921.6 Numerical Methods - 922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2014.11.027
Database: Compendex
42. Accession number: 20145200366377
Title: Biogas slurry fertilizer applicator for dark irrigation
Authors: Li, Wenzhe1 ; Yuan, Hu1 ; Liu, Hongxin1 ; Wang, Ming1 ; Li, Wentao1 ; Yin, Lili1
Author affiliation: 1 College of Engineering, Northeast Agricultural University, Harbin , China
Corresponding author: Li, Wenzhe
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 75-80
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Biogas slurry residue has the characteristics of continuity and Large quantity. It has also a great difference with conventional liquid fertilizers. A fertilizer machinery used for biogas slurry dark field irrigation is designed based on the physical parameters of biogas slurry, and it can complete the operations of ditching, fertilizing, ridging, the suppression of process at one time. An distributor adopted by the fertilizer spreader can change continuous flow into intermittent flow and concentrate fluid energy, as a result the anti-blocking capability of the flow are improved to some extent. In addition, the maximum stress of fertilizing shovel applied the job force are in the allowable stress range. According to the calculations of the mechanical traction power for the entire fertilizer, DFH X904 tractor can meet the power demand of the fertilizing machinery when operating.
Number of references: 13
Main heading: Fertilizers
Controlled terms: Applicators - Biogas - Irrigation - Machinery
Uncontrolled terms: Biogas slurry - Blocking capability - Dark irrigation fertilization - Distributor - Fertilizer spreaders - Intermittent flows - Liquid fertilizers - Physical parameters
Classification code: 522 Gas Fuels - 601 Mechanical Design - 804 Chemical Products Generally - 821.3 Agricultural Methods
DOI: 10.6041/j.issn.1000-1298.2014.11.012
Database: Compendex
43. Accession number: 20145200365908
Title: Ultrasonic pulse-echo model for carbon fiber reinforced polymer in frequency domain
Authors: Chen, Yuechao1 ; Yang, Chenlong1 ; Zhou, Xiaojun1 ; Li, Zhao1 ; Zheng, Huifeng2
Author affiliation: 1 The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou , China
2 College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou , China
Corresponding author: Yang, Chenlong
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 330-336
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The frequency domain of ultrasonic pulse-echo signal obtained from carbon fiber reinforced polymer (CFRP) was studied. First the frequency domain feature of reflection coefficient for the fiber layer and resin layer in CFRP laminate was analyzed. The result shows that normal and porous fiber layer, and normal and thick had different influence on the acoustic reflection coefficient. Based on the result above, the frequency domain model for the pulse echo signal acquired from CFRP laminate was established. The pulse-echo signal spectrum was composed of normal fiber/resin layer response, porous fiber layer response, thick resin layer response, probe response and noise signal response. Then the numerical simulation of CFRP laminate was implemented based on the model. The simulation signal spectrum of CFRP laminate with voids as well as the spectrum of CFRP laminate without voids was obtained. The results show that the simulation signal spectrums had the same main frequency components with the corresponding experimental signal spectrums.
Number of references: 16
Main heading: Frequency domain analysis
Controlled terms: Carbon - Carbon fiber reinforced plastics - Computer simulation - Fibers - Polymers - Reflection - Reinforced plastics - Reinforcement - Resins
Uncontrolled terms: Carbon fiber reinforced polymer - Frequency domain model - Frequency domains - Pulse echo signals - Signal spectrum - Simulation signals - Ultrasonic pulse - Ultrasonic pulse-echo method
Classification code: 415 Metals, Plastics, Wood and Other Structural Materials - 415.2 Plastics Structural Materials - 711 Electromagnetic Waves - 723.5 Computer Applications - 731.1 Control Systems - 804 Chemical Products Generally - 812 Ceramics, Refractories and Glass - 815.1 Polymeric Materials - 815.1.1 Organic Polymers - 817 Plastics and Other Polymers: Products and Applications - 817.1 Polymer Products - 951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2014.11.051
Database: Compendex
44. Accession number: 20145200366367
Title: Vehicle mass and road grade estimation based on extended kalman filter
Authors: Lei, Yulong1 ; Fu, Yao1 ; Liu, Ke1 ; Zeng, Huabing1 ; Zhang, Yuanxia1
Author affiliation: 1 State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun , China
Corresponding author: Lei, Yulong
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 9-13 and 8
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To solve the problem that vehicle mass and road grade in automatic transmission control system are difficult to measure, the state-space model of system was established based on the vehicle longitudinal dynamic model, using the optimal estimation theory. The forward Euler method was adopted for discretization of the process equation. The Jacobian of the process equation was calculated for linearization of the non-linear process function. Then, the vehicle mass and road grade estimation algorithm using extended kalman filter was developed. The simulation using road test data was carried out in Matlab/Simulink environment. The simulation results show that this algorithm could estimate vehicle mass and road grade effectively and meet the requirements of the automatic transmission control system.
Number of references: 12
Main heading: Vehicle transmissions
Controlled terms: Control systems - Extended Kalman filters - Kalman filters - MATLAB - Roads and streets - State space methods - Transportation - Vehicles
Uncontrolled terms: Automatic transmission - Extended - Optimal estimations - Road grades - Vehicle mass
Classification code: 406.2 Roads and Streets - 432 Highway Transportation - 602.2 Mechanical Transmissions - 731.1 Control Systems - 921 Mathematics
DOI: 10.6041/j.issn.1000-1298.2014.11.002
Database: Compendex
45. Accession number: 20145200366372
Title: Effects of exhaust pipe heat insulation on unregulated emissions from gasohol fueled SI engine
Authors: Liu, Fangjie1 ; Miao, Jiaxuan1 ; Liu, Shenghua2 ; Wei, Yanju2 ; Xu, Bin1 ; Wu, Jian1
Author affiliation: 1 School of Vehicle and Traffic Engineering, Henan University of Science and Technology, Luoyang , China
2 School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an , China
Corresponding author: Liu, Fangjie
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 40-46
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The effects of exhaust pipe insulation on unregulated emissions of a spark ignition (SI) engine fueled with M10 (10% of methanol in blend by volume) and E10 (10% of ethanol in blend by volume) blends respectively were experimentally investigated with gas chromatography (equipped with a pulsed discharge helium ionization detector, PDHID). Experimental results show that methanol and ethanol emissions decreased after exhaust pipe heat insulation. After exhaust pipe heat insulation designed, aldehyde emissions did not change obviously at low engine load conditions (Tc < 850 K), but aldehyde emissions decreased significantly at middle-high engine load conditions (Tc ≥ 850 K), and the decreasing range of unregulated emissions increased with exhaust temperature rising. It is conducive to the oxidation of unregulated emissions with prolonging the reaction time of unregulated emissions in high temperature environment after exhaust pipe heat insulation designed. Unregulated emissions decreased significantly with exhaust pipe heat insulation when the exhaust temperature (Tc) was higher than about 900 K. Exhaust temperature and reaction time had a greater influence on the oxidation of alcohol and aldehyde emissions.
Number of references: 17
Main heading: Gas emissions
Controlled terms: Aldehydes - Engines - Ethanol - Gas chromatography - Gasohol - Gasoline - Insulation - Ionization of gases - Methanol
Uncontrolled terms: Ethanol emissions - Exhaust pipes - Exhaust temperature - High-temperature environment - Ionization detectors - Oxidation of alcohols - Spark-ignition engine - Unregulated emissions
Classification code: 413 Insulating Materials - 451.1 Air Pollution Sources - 523 Liquid Fuels - 612 Engines - 801 Chemistry - 802.2 Chemical Reactions - 804.1 Organic Compounds
DOI: 10.6041/j.issn.1000-1298.2014.11.007
Database: Compendex
46. Accession number: 20145200366410
Title: Image compression method with low memory cost on sensor nodes of WMSN
Authors: Lu, Mingzhou1 ; Shen, Mingxia1 ; Liu, Zhiqiang1 ; Liu, Longshen1 ; Yang, Xiaojing2 ; Wang, Yu3
Author affiliation: 1 Jiangsu Province Engineering Lab for Modern Facility Agriculture Technology and Equipment, Nanjing Agricultural University, Nanjing , China
2 Key Laboratory of Animal Physiology and Biochemistry, Ministry of Agriculture, Nanjing Agricultural University, Nanjing , China
3 School of Information Science and Engineering, South East University, Nanjing , China
Corresponding author: Shen, Mingxia
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 292-297 and 310
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Based on bit plane and adaptive binary arithmetic coding, a wavelet coefficients coding scheme which could match the line-based wavelet transform efficiently was proposed. The MCU of the image sensor node read image data from FIFO line by line, executed multi-level wavelet transform, determined the quantization value according to the probability distribution of the wavelet coefficients in different level, performed adaptive binary arithmetic coding based on four binary probabilistic model and realized image compression based on wavelet transform with a low cost of SRAM. The image compression method was applied to handle a 320 pixels× 240 pixels gray image of piglets. Experimental results show that the SRAM cost, time cost and the PSNR was 5.749 KB, 16.312 s and 39.72 dB respectively when the quantization value was set to three. This study established the foundation for agricultural image transmission over the low bandwidth WMSN efficiently.
Number of references: 17
Main heading: Wavelet transforms
Controlled terms: Codes (symbols) - Costs - Digital arithmetic - Image coding - Image compression - Pixels - Probability distributions - Sensor networks - Sensor nodes - Static random access storage
Uncontrolled terms: Binary arithmetic - Binary arithmetic coding - Bit planes - Image compression methods - Low memeory coefficient coding - Multimedia sensor networks - Probabilistic modeling - Wavelet coefficients
Classification code: 722 Computer Systems and Equipment - 723.2 Data Processing and Image Processing - 723.5 Computer Applications - 732 Control Devices - 911 Cost and Value Engineering; Industrial Economics - 921.3 Mathematical Transformations - 921.6 Numerical Methods - 922.1 Probability Theory
DOI: 10.6041/j.issn.1000-1298.2014.11.045
Database: Compendex
47. cession number: 20145200366370
Title: Differential control strategy research of wheeled electric drive ADT mining truck
Authors: Sun, Huilai1 ; Shen, Yanhua1 ; Jin, Chun1 ; Wang, Ping1
Author affiliation: 1 School of Mechanical Engineering, University of Science and Technology Beijing, Beijing , China
Corresponding author: Shen, Yanhua
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 27-33
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the special structure and steering characteristic of wheeled electric-driven articulated underground mining truck, a differential control strategy which took the equal slip rate as control target was given. The kinematic and dynamic model of electric-driven mining ADT was established and the kinematic relationship and stress condition of the driving wheels were analyzed during steering. Acceleration sensors in the sample ADT were used to test the actual speed of the vehicle. Results showed that the filtered signal had small delay and fast response and could be directly used to estimate the speed. Equal slip rate control strategy was superior to equal torque control strategy because it could make full use of the ground adhesion coefficient and achieved the reasonable distribution of drive power. Two sides wheel slip ratio could be stable on -0.08 and the sliping phenomenon was avoided in experimental turning. This control strategy has practical effect for reducing tire wear and improving driving power utilization.
Number of references: 15
Main heading: Mine trucks
Controlled terms: Automobile steering equipment - Electric drives - Electric power utilization - Kinematics - Signal processing - Trucks - Wheels
Uncontrolled terms: Acceleration sensors - Adhesion coefficient - Control strategies - Differential control - Electric differentials - Mining trucks - Slip rates - Steering characteristics
Classification code: 601.2 Machine Components - 663.1 Heavy Duty Motor Vehicles - 663.2 Heavy Duty Motor Vehicle Components - 705 Electric Generators and Motors - 706.1 Electric Power Systems - 716.1 Information Theory and Signal Processing - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2014.11.005
Database: Compendex
48. Accession number: 20145200366382
Title: Parameter optimization and field test of threshing and separation device in tangential-longitudinal combine
Authors: Li, Yaoming1 ; Wang, Chenghong1 ; Xu, Lizhang1 ; Li, Lei1 ; Xue, Zhen2
Author affiliation: 1 Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang , China
2 Jiangsu Changfa-fengling Agricultural Equipment Co., Ltd., Taizhou , China
Corresponding author: Li, Yaoming
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 111-116
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to obtain the optimal structure and operational parameters of the threshing and separation device of tangential-longitudinal combine, rice harvest in field was conducted to study influence of tangential drum-concave gap, longitudinal drum-concave gap and speed of tangential drum and longitudinal drum on the performance of total threshing-and-separation power consumption, tangential drum power consumption, longitudinal drum power consumption and entrained loss. The combine was re-constructed based on self-developed tangential-longitudinal combine and load test system was built for the combine. Optimal parameters are gained by quadric polynomial regress analysis and complex method, and tangential drum-concave gap is 30.99 mm, longitudinal drum-concave gap is 14 mm and the speed of tangential drum and longitudinal drum is 892.95 r/min and 848.95 r/min respectively. The test result showed that on the parameter's condition, total power consumption was 39.03 kW, power consumption of tangential drum and longitudinal drum were 11.72 kW and 27.31 kW respectively and the entrained loss rate was 0.50%. Mixture distribution under tangential drum and longitudinal drum was analyzed, and it provide basis for design and optimization of cleaning unit.
Number of references: 15
Main heading: Structural optimization
Controlled terms: Agriculture
Uncontrolled terms: Field test - Parameter optimization - Rice - Separation devices - Tangential drums
Classification code: 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 921.5 Optimization Techniques
DOI: 10.6041/j.issn.1000-1298.2014.11.017
Database: Compendex
49. Accession number: 20145200366398
Title: Key technologies for establishment agricultural products and food quality safety traceability systems
Authors: Yang, Xinting1 ; Qian, Jianping1 ; Sun, Chuanheng1 ; Ji, Zengtao1
Author affiliation: 1 National Engineering Research Center for Information Technology in Agriculture, Beijing Academy of Agricultural and Forestry Sciences, Beijing , China
Corresponding author: Yang, Xinting
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 212-222
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Traceability systems gain more attention in worldwide as an effective method for controlling agricultural products and food quality safety. The concepts of traceable and traceability system were discriminated. Key technologies for establishment traceability systems, such as coding and identification, real-time record keeping in the supply chain, intelligent decision making and early warning and data exchange and query, were summarized. Combined IOT (internet of things) technology, the technology framework of traceability system including one kernel, two axes and three chains was constructed. One kernel means to implement the goal of agricultural products and food quality safety traceability. Two axes are the supply chain from farm to table as the horizontal axe and the IOT technologies from information sensing, information transmission to intelligent decision as the vertical axe. Three chains include products chain for supply lifecycle, service chain for supply chain actors and technology chain for IOT. Furthermore, the urgent problems for implement the traceability system were put forward, which included unified encoding, low cost and quick information collection equipment, application system with intelligent decision model and collaborative traceability platform.
Number of references: 94
Main heading: Life cycle
Controlled terms: Agricultural products - Chains - Decision making - Electronic data interchange - Food products - Food safety - Internet of things - Real time systems - Records management - Search engines - Supply chains
Uncontrolled terms: Information collections - Information transmission - Intelligent decision making - Intelligent decisions - Iot( internet of things) - Quality safety - Technology system - Traceability
Classification code: 602.1 Mechanical Drives - 722.4 Digital Computers and Systems - 723 Computer Software, Data Handling and Applications - 723.2 Data Processing and Image Processing - 821.4 Agricultural Products - 822.3 Food Products - 912 Industrial Engineering and Management - 912.2 Management - 913 Production Planning and Control; Manufacturing - 913.1 Production Engineering
DOI: 10.6041/j.issn.1000-1298.2014.11.033
Database: Compendex
50. Accession number: 20145200365909
Title: Experimental study on mechanical properties of flexible pneumatic bending joint
Authors: Shao, Tiefeng1, 2 ; Zhang, Libin1 ; Dou, Mingyu1 ; Bao, Guanjun1 ; Luo, Xinyuan1 ; Yang, Qinghua1
Author affiliation: 1 Key Laboratory of E and M, Ministry of Education and Zhejiang Province, Zhejiang University of Technology, Hangzhou , China
2 Engineering Training Center, China Jiliang University, Hangzhou , China
Corresponding author: Yang, Qinghua
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 337-342 and 323
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A new type of flexible pneumatic bending joint (FPBJ) and its mathematical model were proposed. To implement its real-time closed-loop control system, its mathematical model was simplified, and the mechanical characteristics were studied experimentally. An experimental platform for mechanical characteristics testing was set up, and two FPBJs with different length (40 mm and 60 mm) were tested. The experimental results were analyzed with Matlab curve and surface fitting toolbox, and the FPBJ empirical model was derived. The model showed a non-linear relationship among the bending angle, the FPBJs internal and external pressure difference, joint length and the output force of the FPBJs. Contrast to the simplified mathematical model, the empirical model was more precise, the mean relative error of output angle model was less than 6.7%, and the mean relative error of output force model was less than 2%. Meanwhile, an error, the joint length is proportional to the bending angle in the mathematical model, was avoided in the empirical model.
Number of references: 19
Main heading: Mathematical models
Controlled terms: Closed loop control systems - Curve fitting - Fiber optic sensors - Mechanical properties - Pneumatics
Uncontrolled terms: Curve and surface fittings - Empirical model - Experimental platform - Mean relative error - Mechanical characteristics - Non-linear relationships - Simplified mathematical model - Surface fitting
Classification code: 632.3 Pneumatics - 732.2 Control Instrumentation - 921 Mathematics - 951 Materials Science - 961 Systems Science
DOI: 10.6041/j.issn.1000-1298.2014.11.052
Database: Compendex
51. Accession number: 20145200366389
Title: Research on characterization method of statistical data of scale raising farms
Authors: Yan, Bojie1 ; Pan, Yuchun2
Author affiliation: 1 Department of Geography, Minjiang University, Fuzhou , China
2 National Engineering Research Center for Information Technology in Agriculture, Beijing , China
Corresponding author: Yan, Bojie
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 154-158
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The present method for allocating the nutrient of livestock manure from the scale raising farms is simply allocating the total amount of statistical data of scale raising farms according to the area of farmland taking administration cell as unit. In this method, it is thought that there are no differences among the farmlands and the amount of statistical data of scale raising farms is only closely related to the area of farmland in a administration cell. The specialization algorithm of statistical data of scale raising farms was constructed based on the spatial differences among the farmlands and the particularity of livestock manure from the scale raising farms, when it applied as the fertilizer to farmland using theory and technique of GIS spatial analysis. With the maximum nutrient load of farmland, the statistical data of scale raising farms were transformed to the supply of regional nutrient of livestock manure. Finally, the specialization algorithm was carried out at the town of Shangjie to realize the application. The results of practical application show that the maximum values of nitrogen and phosphorus load of farmland were 169.994 kg/hm2 and 34.973 kg/hm2, which both were below the threshold value of 170 kg/hm2 and 35 kg/hm2 respectively. And it also shows that the method could reflect the spatial differences between the farmlands and was closer to the practical results of livestock manure than the present method.
Number of references: 19
Main heading: Farms
Controlled terms: Manures - Nutrients - Statistics
Uncontrolled terms: Characterization methods - Livestock manure - Nitrogen and phosphorus - Nutrient loads - Spatial analysis - Spatial differences - Specialization - Statistical datas
Classification code: 821 Agricultural Equipment and Methods; Vegetation and Pest Control - 922.2 Mathematical Statistics
DOI: 10.6041/j.issn.1000-1298.2014.11.024
Database: Compendex
52. Accession number: 20145200366415
Title: Kinematic analysis and experiment of H-shaped parallel mechanism
Authors: Yang, Jidong1 ; Yang, Zhongshan1 ; Liu, Dong1 ; Liu, Hao1
Author affiliation: 1 School of Mechanical Engineering, Chongqing University, Chongqing , China
Corresponding author: Yang, Jidong
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 324-329
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Through kinematic analysis of the H-shaped parallel mechanism, the degree of freedom was derived. The inverse and forward position model of this mechanism were established by employing kinematic superposition principle and the analytical solution was obtained. The condition number of Jacobian matrix was derived and the workspace was analysed. The result of the calculation shows that this mechanism had perfect isotropic properties and specious workspace. Further analysis of the inverse position solution adopting homogeneous transformation and matrix decomposition indicated that the trajectory between the input and output coordinate was geometrically similar. Based on that, a control strategy for fine interpolation only using general motion controller was proposed. A model machine was developed and a series of experiments were carried out, such as line/circle interpolation, continuous interpolation and etc. The results suggest that the mathematical model established for this parallel mechanism was correct.
Number of references: 18
Main heading: Kinematics
Controlled terms: Degrees of freedom (mechanics) - Experiments - Interpolation - Jacobian matrices - Linear transformations - Mathematical models - Mechanisms - Motion control - Number theory
Uncontrolled terms: 2-DOF - Continuous interpolations - Homogeneous transformations - Isotropic property - Kinematic Analysis - Matrix decomposition - Parallel mechanisms - Superposition principle
Classification code: 601.3 Mechanisms - 731.3 Specific Variables Control - 901.3 Engineering Research - 921 Mathematics - 931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2014.11.050
Database: Compendex
53. Accession number: 20145200366394
Title: Monitoring of straw solid-state fermentation based on e-nose and gaussian process
Authors: Mei, Congli1 ; Shu, Dongxin1 ; Jiang, Hui1 ; Huang, Wentao1 ; Liu, Guohai1
Author affiliation: 1 School of Electronic and Information Engineering, Jiangsu University, Zhenjiang , China
Corresponding author: Mei, Congli
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 45
Issue: 11
Issue date: November 25, 2014
Publication year: 2014
Pages: 188-193
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The e-nose system and Gaussian process (GP) classifier were used to accurately monitor physical and chemical changes in solid-state fermentation (SSF) of crop straws to replace off-line chemical analysis in laboratory. The SSF experiment cycle is seven days and the gas monitoring data sets were collected by e-nose every 24 hours. In this experiment 20 data sets corresponding to 20 batches of fermentation processes were collected, and ten of which were used for training GP classifier, while the rest for testing the performance of it. Test results show that the e-nose system could effectively monitor SSF process of crop straws and the classification accuracy of GP classifier was higher than that of support vector machine classifier or neural networks classifier. So the e-nose system combined the GP classifier method could be an effective strategy to monitor SSF process of crop straws.
Number of references: 14
Main heading: Monitoring
Controlled terms: Chemical analysis - Classification (of information) - Crops - Experiments - Fermentation - Gaussian distribution - Gaussian noise (electronic) - Straw
Uncontrolled terms: Classification accuracy - E-nose - Fermentation process - Gaussian process - Gaussian Processes - Neural networks classifiers - Solid-state fermentation - Support vector machine classifiers
Classification code: 713 Electronic Circuits - 716 Telecommunication; Radar, Radio and Television - 716.1 Information Theory and Signal Processing - 801 Chemistry - 801.2 Biochemistry - 804 Chemical Products Generally - 821.4 Agricultural Products - 821.5 Agricultural Wastes - 901.3 Engineering Research - 922.1 Probability Theory - 941 Acoustical and Optical Measuring Instruments - 942 Electric and Electronic Measuring Instruments - 943 Mechanical and Miscellaneous Measuring Instruments - 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments
DOI: 10.6041/j.issn.1000-1298.2014.11.029
Database: Compendex
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