2021年第2期共收錄42篇
1. Estimation of Potato Plant Height and Above-ground Biomass Based on UAV Hyperspectral Images
Accession number: 20211110088870
Title of translation:
Authors: Liu, Yang (1, 2); Feng, Haikuan (1, 3); Huang, Jue (2); Sun, Qian (1, 3); Yang, Fuqin (4); Yang, Guijun (1, 3)
Author affiliation: (1) Key Laboratory of Quantitative Remote Sensing in Agriculture, Ministry of Agriculture and Rural Affairs, Beijing Research Center for Information Technology in Agriculture, Beijing; 100097, China; (2) College of Surveying Science and Engineering, Shandong University of Science and Technology, Qingdao; 266590, China; (3) National Engineering Research Center for Information Technology in Agriculture, Beijing; 100097, China; (4) College of Civil Engineering, Henan University of Engineering, Zhengzhou; 451191, China
Corresponding author: Feng, Haikuan(fenghaikuan123@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 188-198
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Plant height (H) and above-ground biomass (AGB) are important parameters for monitoring growth and evaluating yield of crop. It is significant for agricultural precision fertilization management to acquire plant H and AGB information of potato quickly and accurately. Hyperspectral images, measured plant height (H), measured above-ground biomass (AGB) and three-dimensional information of ground control point (GCP) were obtained respectively at the budding stage, tuber formingstage, tuber growth period, starch accumulation period and maturity period of potato. Firstly, the digital surface model (DSM) of test field was generated based on the unmanned aerial vehicle(UAV)hyperspectral gray images combined with GCP, and the potato plant height(Hdsm) was extracted by using DSM. Then correlation analysis of the potato AGB with the original canopy spectrum and hyperspectral indexes was performed, and the optimal spectral parameters and top 10 spectral parameters were selected, and the univariate model was constructed by exponential regression (ER) with plant height and optimal spectral parameters, respectively. Finally, multiple linear regression (MLR), partial least square regression (PLSR)and random forest (RF)were used to construct and compare the AGB estimation model at different growth periods to select the optimal model. The results showed that the Hdsm extracted from the UAV images was highly fitted with the measured plant height (H) (R2=0.84); in the univariate model, the verification accuracy of AGB estimated by ER in each growth period was higher than that of corresponding modeling accuracy, in which the effect of the model was in the order of optimal spectral parameters, Hdsm and H, and the estimation accuracy of CIrededge was the highest (R2=0. 45) in the tuber growth period; in the multivariable model, three methods were used to construct AGB estimation model for each growth period, and the model with spectral index added to Hdsm had higher accuracy in each method. The effect of AGB model with spectral index and Hdsm of MLR (R2 was 0.64, 0.70, 0.79, 0.68 and 0.63) was better than that of PLSR (R2 was 0.62, 0.68, 0.75, 0.67 and 0.60) and RF (R2 was 0.56, 0.61, 0.67, 0.63 and 0.53) in each growth period. The potato AGB was mapped by using the MLR model, and the AGB distribution was consistent with the actual growth situation in the five growth stages. The MLR model integrated with Hdsm can be used to estimate the potato AGB in a large area, which provided technical support for the quantitative research of precision agriculture. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Ecology
Controlled terms: Agricultural robots? - ?Agriculture? - ?Antennas? - ?Biomass? - ?Decision trees? - ?Image processing? - ?Linear regression? - ?Rock mechanics? - ?Spectroscopy? - ?Unmanned aerial vehicles (UAV)
Uncontrolled terms: Digital surface models? - ?Exponential regression? - ?Ground control points? - ?Multi-variable models? - ?Multiple linear regressions? - ?Partial least square regression? - ?Precision fertilizations? - ?Three-dimensional information
Classification code: 454.3 Ecology and Ecosystems? - ?483.1 Soils and Soil Mechanics? - ?652.1 Aircraft, General? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?922.2 Mathematical Statistics? - ?961 Systems Science
DOI: 10.6041/j.issn.1000-1298.2021.02.017
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
2. Remote Sensing Classification of Autumn Crops Based on Hybrid Feature Selection Model Combining with Relief F and Improved Separability and Thresholds
Accession number: 20211110088416
Title of translation:
Authors: Wang, Gengze (1); Jin, Hailiang (1); Gu, Xiaohe (2, 3); Yang, Guijun (3, 4); Feng, Haikuan (3, 4); Sun, Qian (2, 3)
Author affiliation: (1) School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo; 454000, China; (2) Key Laboratory of Quantitative Remote Sensing in Agriculture, Ministry of Agriculture and Rural Affairs, Beijing Research Center for Information Technology in Agriculture, Beijing; 100097, China; (3) National Engineering Research Center for Information Technology in Agriculture, Beijing; 100097, China; (4) Beijing Engineering Research Center for Agriculture Internet of Things, Beijing; 100097, China
Corresponding author: Gu, Xiaohe(guxh@nercita.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 199-210
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The multi-temporal Sentinel-2 images were used to classify the autumn crops in Gaocheng, Shijiazhuang to provide an important basis for the local agricultural planting structure adjustment. The influence of comprehensive multi-features and feature optimization on the extraction accuracy of autumn crop planting area were analyzed. In order to reduce the influence of high-dimensional features on the performance of the classifier, a filter hybrid feature selection model (ReEMISE) based on improved separability and thresholds combined with the Relief F algorithm was proposed. Firstly, the Relief F dimensionality reduction algorithm was used to select the features. Secondly, the improved separability and thresholds (EMISE) combined with image entropy was used to further optimize the preliminary feature set, and then the EMISE feature importance value was given a Relief F feature weight. Finally, the random forest model was used to extract the crop planting area from the optimized feature subset, and compared with the random forest classification accuracy of the Relief F dimensionality reduction algorithm and the EMISE dimensionality reduction algorithm. The purpose was to ensure the accuracy of classification, minimize the feature dimensions and improve the classification efficiency. Six different types of feature variables were generated based on the Sentinel-2 data with multi-phase and rich spectral information, including multi-temporal spectral features, traditional index features, red-edge index features, texture features, difference features of different time-phase bands, and ratio features of different time-phase bands. On the basis of multi-temporal spectral features, adding different features, totally six groups of different feature combination experiments were constructed to extract autumn crop planting area and verify the classification accuracy of different feature combination. At the same time, the influence of different features on the extraction accuracy of crop planting area was analyzed from two aspects: the importance of features and the classification accuracy of different feature combinations. The results showed that the best correlation coefficient threshold of the ReEMISE’s feature-optimized random forest model(RF_ReEMISE) was 0.96. The accuracy was the highest when the number of feature variables was 9 and the overall accuracy and Kappa coefficient were 95.391 8% and 0.939 7, respectively. The advantages of the RF_ReEMISE mainly included two aspects, i. e., the least number of feature variables at the highest accuracy, and the classification accuracy index of ReEMISE algorithm was the highest when the number of different feature variables of the three algorithms attained the best accuracy. Comprehensive multi-feature was the key to improve the accuracy of crop classification. Based on the multi-temporal spectral features, the traditional index features and the red-edge index features were added respectively, and the overall accuracy was improved by 1.502 1 percentage points and 1.571 5 percentage points, and the Kappa coefficient was increased by 0.019 8 and 0.020 7. The accuracy was slightly reduced when adding the texture features, the difference features of different time-phases bands, and the ratio features of different time-phase bands. The RF_ReEMISE can reduce the feature dimensions, improve the classification accuracy, and achieve the balance between efficiency and accuracy. The spectral differences of crops at different phenological stages can be better reflected by introducing the ratio features of different time-phase bands than the difference features of different time-phase bands. It was found that correlation between the red-edge vegetation index and chlorophyll was stronger, and the importance of features was higher. The RF_ReEMISE with multi-features can effectively improve the accuracy and efficiency of autumn crop classification. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 40
Main heading: Classification (of information)
Controlled terms: Agricultural robots? - ?Crops? - ?Decision trees? - ?Dimensionality reduction? - ?Efficiency? - ?Extraction? - ?Feature extraction? - ?Image enhancement? - ?Random forests? - ?Remote sensing ? - ?Textures
Uncontrolled terms: Accuracy of classifications? - ?Classification accuracy? - ?Classification efficiency? - ?Dimensionality reduction algorithms? - ?High dimensional feature? - ?Hybrid feature selections? - ?Random forest classification? - ?Remote sensing classification
Classification code: 716.1 Information Theory and Signal Processing? - ?802.3 Chemical Operations? - ?821.4 Agricultural Products? - ?913.1 Production Engineering? - ?961 Systems Science
DOI: 10.6041/j.issn.1000-1298.2021.02.018
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
3. Spatio-temporal Variation of Paddy Soil Acidification and Its Response to Nitrogen Surplus in China
Accession number: 20211110088885
Title of translation:
Authors: Ye, Yingcong (1); Sun, Bo (1); Liu, Shaogui (2); Li, Wenxi (2); Yang, Fan (3)
Author affiliation: (1) State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing; 210008, China; (2) Yangzhou Station of Farmland Quality Protection, Yangzhou; 225101, China; (3) Center of Arable Land Quality Monitoring and Protection, Ministry of Agriculture and Rural Affairs, Beijing; 100125, China
Corresponding author: Sun, Bo(bsun@issas.ac.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 246-256
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Paddy soil is the most important arable land resource in China, the acidification of paddy soil not only reduced the crop yields but also increased the risk of environmental risk. Data from the second national soil survey (1979-1985, the first period) and from the paddy soil quality grading survey (2015-2017, the second period) were collected, and were combined with the national soil testing and formula fertilization data from 2005 to 2015. The spatial analysis and the statistical analysis methods were used to analyze the spatio-temporal variation of paddy soil acidification. During the two periods, the spatial layout dynamic changes of paddy soil pH value and the acidification rate of paddy soil with different pH value levels and regions were analyzed, the correlations between nitrogen input, soil physical and chemical properties and acidification rate of paddy soil were discussed. Besides, the correlation between the nitrogen fertilizer surplus amount from 2015 to 2017 and the change of the paddy soil pH value from 2015 to 2017 was further quantified. The results showed that the intensity of soil acid stress on rice in China was increased during the two periods, especially the increase of area from the acid paddy soils (pH value was 5. 5~6.5) to the strongly acid paddy soils (pH value was no more than 5. 5), mainly distributed in the middle and southern parts of MLYR (middle and lower Yangtze River), and the central and southern parts of SC (Southwest China). From 1979 to 1985, the average pH value of paddy soil was 6.03, and it was dropped by 0.26 in the year from 2015 to 2017. Among them, the NC (Northeast China), the MLYR (middle and lower Yangtze River) and the SC (Southern China) were dropped by 0.34, 0.29 and 0.58 respectively, while the SW (Southwest China) was increased by 0.14. The acidification rate of the paddy soil survey sites during the two periods from high to low was as follows: alkaline paddy soil, neutral paddy soil, acid paddy soil, strongly acid paddy soil. Regionally, the acidification rate of the paddy soil survey sites during the two periods from high to low was as follows: NC, SC, MLYR, and SW. During the two periods, the paddy soil acidification rate was significantly positively correlated with the change of nitrogen input amount and soil bulk density, but was significantly negatively correlated with the change of paddy soil organic matter content and the plough layer thickness. From 2015 to 2017, there was a significant negative correlation between the nitrogen surplus amount and the change of the paddy soil pH value, such that the nitrogen surplus amount was increased with the decrease of paddy soil pH value. Therefore, the paddy soil remediation zones should apply the balanced fertilization with soil testing formula, control amount of nitrogen fertilizer, and promote environmental-friendly organic manure to replace chemical nitrogen fertilizer. Besides, in the remediation zone mainly with alkaline and neutral paddy soils, the technology of straw chopping and return to the paddy field with rotary tillage or moldboard tillage could be applied to decrease the paddy soil acidification rate. In the remediation zone mainly with acid paddy soils, the technology of straw returning could be applied to maintain the paddy soil pH value. In the remediation zone mainly with strongly acid paddy soils, the agricultural calcareous material could be used to raise the paddy soil pH value. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 48
Main heading: Soils
Controlled terms: Acidification? - ?Agricultural robots? - ?Agriculture? - ?Alkalinity? - ?Chemical analysis? - ?Grading? - ?Nitrogen fertilizers? - ?pH? - ?Soil conservation? - ?Soil pollution ? - ?Soil surveys? - ?Soil testing
Uncontrolled terms: Calcareous material? - ?Environmental risks? - ?Environmental-friendly? - ?Middle and lower yangtze rivers? - ?Negative correlation? - ?Soil physical and chemical properties? - ?Spatio-temporal variation? - ?Statistical analysis methods
Classification code: 483.1 Soils and Soil Mechanics? - ?801.1 Chemistry, General? - ?804 Chemical Products Generally? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?822.2 Food Processing Operations
DOI: 10.6041/j.issn.1000-1298.2021.02.023
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
4. Design and Experiment of Measurement and Control System for Alfalfa Conditioning Test Bench
Accession number: 20211110088478
Title of translation:
Authors: Song, Zhanhua (1, 2); Xing, Shulun (1); Wang, Zheng (1); Tian, Fuyang (1, 3); Wang, Fengde (4); Li, Fade (1, 2)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) Shandong Key Laboratory of Horticultural Machinery and Equipment, Tai’an; 271018, China; (3) Shandong Engineering Laboratory of Agricultural Equipment Intelligence, Tai’an; 271018, China; (4) Chinese Academy of Agricultural Mechanization Sciences, Beijing; 100083, China
Corresponding author: Li, Fade(lifade@sdau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 122-134
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to study the influence of various factors on the alfalfa conditioning performance, a set of the measurement and control system for alfalfa conditioning test bench was built with the LabVIEW software on the basis of the existing alfalfa conditioning test bench. The measurement and control system was mainly composed of four parts, including a motor control and monitoring system, a data acquisition system, a conditioning gap regulating system and a PC system. By the measurement and control system with the data acquisition frequency of 1 kHz, the conditioning rotate speed can be adjusted continuously in the range from 350 r/min to 1 350 r/min, and the conditioning gap between both rubber rollers can be controlled accurately between 2 mm and 4 mm. The curves, such as the torque and the speed of the fixed roller, the power of the motor, the pressure of the hydraulic cylinder used for regulating the gap between the rollers, were displayed and saved in real time on the front panel of the measurement and control system. A three-factor three-level response surface test with the Box-Behnken test method was carried out using alfalfa with the alfalfa conditioning test bench equipped with a measurement and control system. The results showed that the measurement and control system could achieve precise control of the alfalfa conditioning test bench and real-time accurate data collection. By the analysis of the test data, the quadratic regression models of the unit energy consumption, the alfalfa flattening rate and the flattening loss rate were established, respectively, the optimal solution of the working parameters of the alfalfa conditioning test bench were achieved, that was, the rotate speed of the conditioning rollers was 775 r/min, and the gap of conditioning rollers was 3.3 mm, and the feeding rate of the per unit working length of the conditioning rollers was 2.77 kg/(m?s). Meanwhile, the optimal solutions of the conditioning qualities of alfalfa under the optimal working parameters conditions were achieved, respectively, that was, the unit energy consumption was 909. 25 J/kg, the flattening rate of alfalfa was 96. 67%, and the flattening loss rate was 1.67%. The working parameters of the alfalfa conditioning test bench were set as the optimal solution parameters of the models listed above, the confirmation tests with the alfalfa were carried out. The results showed that the measurement values of the conditioning quality parameters of the alfalfa under the optimal working parameters conditions were consistent with the optimization results, that was, the unit energy consumption, the flattening rate and the flattening loss rate of alfalfa were 931.42 J/kg, 94.33% and 1.65%, respectively, and the relative errors between the solution optimization values of the models and the measured values of the confirmation tests were less than 3%. The results showed that the measurement and control system provided a reliable technical support for the alfalfa conditioning test, and provided a data reference and theoretical basis for the design of alfalfa conditioning mechanism and the selection of working parameters. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 42
Main heading: Monitoring
Controlled terms: Computer programming languages? - ?Data acquisition? - ?Energy utilization? - ?Optimal systems? - ?Parameter estimation? - ?Regression analysis? - ?Rollers (machine components)? - ?Software testing? - ?Solution mining? - ?Testing
Uncontrolled terms: Conditioning tests? - ?Data acquisition system? - ?Hydraulic cylinders? - ?Measurement and control systems? - ?Quadratic regression? - ?Quality parameters? - ?Solution optimizations? - ?Working parameters
Classification code: 502.1 Mine and Quarry Operations? - ?525.3 Energy Utilization? - ?601.2 Machine Components? - ?723 Computer Software, Data Handling and Applications? - ?922.2 Mathematical Statistics? - ?961 Systems Science
Numerical data indexing: Frequency 1.00e+03Hz, Percentage 1.65e+00%, Percentage 1.67e+00%, Percentage 3.00e+00%, Percentage 6.70e+01%, Percentage 9.43e+01%, Rotational_Speed 3.50e+02RPM to 1.35e+03RPM, Rotational_Speed 7.75e+02RPM, Size 2.00e-03m to 4.00e-03m, Size 3.30e-03m, Specific_Energy 2.50e+01J/kg, Specific_Energy 9.31e+02J/kg
DOI: 10.6041/j.issn.1000-1298.2021.02.011
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
5. Seed Location Prediction Method of Maize High-height Precision Planting Based on Satellite Positioning
Accession number: 20211110088924
Title of translation:
Authors: Yan, Bingxin (1); Fu, Weiqiang (1); Wu, Guangwei (1); Xiao, Yuejin (1); Meng, Zhijun (1)
Author affiliation: (1) Beijing Research Center of Intelligent Equipment for Agriculture, Beijing; 100097, China
Corresponding author: Meng, Zhijun(mengzj@nercita.org.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 44-54
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to meet the needs of precision agriculture for crop location information, achieve accurate plant position of crops, and solve the problem of low resource utilization rate and high operation cost caused by repeated identification and positioning of plants in each part of field management, a seed location method at planting process was proposed. Seed position, which was regarded as plant location, was mapped and saved during planting process, and it could be shared and used in the follow-up field management links. This method was based on a seeder equipped with a satellite receiver and four seed quality detection sensors. Seeder was mounted with an automatic navigation tractor. Tractor and seeder were hinge joint, relative positions changing during the operation, thus, satellite receiver was installed on seeder frame girder instead of tractor cab roof. Real-time kinematic (RTK) receiver collected satellite observation data from satellite antenna and fixed base station data from radio antenna at a frequency of 10 Hz, and formed differential data in system for real-time analytical processing, to achieve accurate acquisition of information such as the position of seeding unit and coordinated universal time (UTC). Seed quality detection sensors were triggered when seed passed through seeds tube, and signal acquisition circuit recorded trigger time and row number at the same time, then transmitted the information to main controller. Seed touched ditch time was determined in combination with UTC time, trigger time and time difference. Position of seeding unit at seed touched ditch time was determined by using equal velocity interpolation method. A mathematic model of seeding unit and planter monomer relative position was established based on spatial location of the seeder, planter monomer position could be extrapolated by this model. Combining with E-discrete element method (EDEM) numerical simulation and dynamic simulation, time and distance difference compensation model was established, seeds localization could be predicted. The operation quality of the seed location method was evaluated for the operation speed(3 km/h, 5 km/h and 7 km/h), sowing spacing(0.2 m, 0.3 m and 0.4 m) and GPS frequency (1 Hz, 5 Hz and 10 Hz) by deviation of implantation position (DIP) and accuracy of implantation position (AIP). Field trails results showed that operation speed and GPS frequency significantly affected DIP (pIP (pIP(pIP (p>0.05). With the decrease of operation speed, the increase of sowing spacing and GPS frequency, the DIP was decreased. With the decrease of operation speed, the AIP was increased. At the operation speed of 3 km/h, sowing spacing of 0.4 m and GPS frequency of 10 Hz, the system gave the best DIP and AIP of 24.3 mm and 88.9%, respectively. This method can provide theoretical reference for synchronous generation of seed map in seeding process, provide position information support for each link of field management in crop growth process, such as precise weeding, top dressing and application, and provide technical and data support for digital and intelligent precision operations. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 39
Main heading: Global positioning system
Controlled terms: Agricultural robots? - ?Crops? - ?Information management? - ?Location? - ?Monomers? - ?Numerical methods? - ?Satellite antennas? - ?Satellites? - ?Seed? - ?Signal processing ? - ?Speed? - ?Tracking (position)? - ?Tractors (agricultural)? - ?Tractors (truck)
Uncontrolled terms: Automatic navigation? - ?Compensation modeling? - ?Coordinated universal time? - ?Position information? - ?Resource utilizations? - ?Satellite observations? - ?Satellite positioning? - ?Velocity interpolation
Classification code: 655.2 Satellites? - ?663.1 Heavy Duty Motor Vehicles? - ?716 Telecommunication; Radar, Radio and Television? - ?716.1 Information Theory and Signal Processing? - ?804 Chemical Products Generally? - ?821.4 Agricultural Products? - ?921.6 Numerical Methods
Numerical data indexing: Frequency 1.00e+00Hz, Frequency 1.00e+01Hz, Frequency 5.00e+00Hz, Percentage 8.89e+01%, Size 2.00e-01m, Size 2.43e-02m, Size 3.00e-01m, Size 4.00e-01m, Velocity 1.39e+00m/s, Velocity 1.94e+00m/s, Velocity 8.33e-01m/s
DOI: 10.6041/j.issn.1000-1298.2021.02.004
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
6. Effects of Straw Mulching on Soil Water-salt Transportation and Water Use Efficiency of Maize under Furrow Irrigation
Accession number: 20211110088970
Title of translation:
Authors: Fan, Leilei (1); Shi, Haibin (1); Li, Ruiping (1); Miao, Qingfeng (1); Wang, Sinan (1); Pei, Wenwu (2)
Author affiliation: (1) College of Water Conservation and Civil Engineering, Inner Mongolia Agricultural University, Huhhot; 010018, China; (2) Inner Mongolia Hetao Irrigation District General Administration, Bayannur; 015000, China
Corresponding author: Shi, Haibin(shi_haibin@sohu.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 283-293 and 319
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to explore the characteristics of water and salt migration of the ridge-back plastic film and straw mulch on the ditch section of the typical saline soil in Hetao Irrigation District, and clarify the changes in crop yield and water use efficiency, the field experiment was carried out in 2019 with ridge-back stalks (0.3 kg/m2, 0.6 kg/m2, 0.9 kg/m2 and 1.2 kg/m2, recorded as P0.3, P0.6, P0.9 and P1.2) and the plastic mulching (DM) and bare land (CK) furrow irrigation test, the comparison and analysis of different straw coverages on the changes of soil water and salt distribution, crop yield and water use efficiency in the ditch section before and after maize growth period were made. Results showed that before maize jointing, film mulching and straw mulching can significantly reduce the ineffective water consumption of crops and ensure the water demand in the later growth period. During the heading grouting period, the temperature increase effect of film mulching promoted the growth of crops, which made treatment DM of maize intensive water consumption and the lowest soil water storage. The soil water movement in the vertical direction at the end of growth was weaker than that in the previous period. In general, the treatments of P1.2 and P0.9 was better than CK in water storage and moisture retention (P0.05). The principal component analysis method was used to comprehensively evaluate the effects of soil moisture retention and salt suppression, maize emergence, yield, and water use efficiency under furrow irrigation straw cover, and it was recommended to use 0.9~1.2 kg/m2 of ridge-back straw coverage instead of conventional plastic film to reduce the environmental impact of plastic film residues. The research result can provide some reference for agricultural cultivation techniques in irrigation areas. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 42
Main heading: Soil surveys
Controlled terms: Agricultural robots? - ?Crops? - ?Cultivation? - ?Efficiency? - ?Environmental impact? - ?Film growth? - ?Groundwater? - ?Irrigation? - ?Plastic films? - ?Replenishment (water resources) ? - ?Saline water? - ?Soil moisture? - ?Water supply
Uncontrolled terms: Agricultural cultivation? - ?Comparison and analysis? - ?Hetao irrigation districts? - ?Plastic film residues? - ?Principal component analysis method? - ?Soil moisture retentions? - ?Temperature increase? - ?Water use efficiency
Classification code: 444 Water Resources? - ?444.2 Groundwater? - ?446.1 Water Supply Systems? - ?454.2 Environmental Impact and Protection? - ?483.1 Soils and Soil Mechanics? - ?817.1 Polymer Products? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products? - ?913.1 Production Engineering
Numerical data indexing: Percentage 1.13e+01%, Percentage 1.41e+01%, Percentage 1.53e+01%, Percentage 2.00e+01%, Percentage 2.47e+01%, Percentage 2.55e+01%, Surface_Density 1.20e+00kg/m2, Surface_Density 3.00e-01kg/m2, Surface_Density 6.00e-01kg/m2, Surface_Density 9.00e-01kg/m2 to 1.20e+00kg/m2, Surface_Density 9.00e-01kg/m2
DOI: 10.6041/j.issn.1000-1298.2021.02.027
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
7. Effects of Drip Fertigation on Accumulation and Translocation of Dry Matter and Nitrogen together with Yield in Wheat
Accession number: 20211110088931
Title of translation:
Authors: Zhang, Lixia (1, 2); Yang, Yonghui (1, 3); Yin, Jun (2); Wu, Jicheng (1, 3); Pan, Xiaoying (1, 3)
Author affiliation: (1) Institute of Plant Nutrition and Resource Environment, Henan Academy of Agricultural Sciences, Zhengzhou; 450002, China; (2) National Engineering Research Center for Wheat, Henan Agricultural University, Zhengzhou; 450046, China; (3) Yuanyang Experimental Station of Crop Water Use, Ministry of Agriculture and Rural Affairs, Yuanyang; 453514, China
Corresponding author: Wu, Jicheng(wujc2065@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 275-282 and 319
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to explore the effects of drip fertigation on accumulation and translocation of dry matter and nitrogen, and yield in wheat, three nitrogen (N) fertilizer levels: N1(180 kg/hm2), N2(240 kg/hm2) and N3(270 kg/hm2), and three water (W) levels: W1 (no irrigation at the growth stage), W2(two times irrigation at the growth stage), and W3 (three times irrigation at the growth stage), were set in two wheat growing seasons (2016-2018) by field experiment. The nine treatments were W1N1, W1N2, W1N3, W2N1, W2N2, W2N3, W3N1, W3N2, and W3N3. The results showed that dry matter accumulation of wheat plant reached its maximum at the flowering and maturing stages in two consecutive years. Compared with the W1N1 treatment, W3N2 treatment increased average dry matter accumulation at the flowering and mature stages, average dry matter translocation amount of the vegetative organs, average dry matter translocation rate, and average contribution rate of dry matter translocation to grain by 32.11%, 13.34%, 48.66%, 56.34%, 42.93%, respectively. In two consecutive years, nitrogen accumulation of wheat plant reached the maximum at the flowering and maturing stages of wheat. Compared with W1N1 treatment, average nitrogen accumulation at both flowering and maturing stages of wheat under W3N2 treatment was increased by 21.98% and 20.30%, respectively. In the mature stage of wheat, compared with W1N1 treatment, W3N2 treatment increased average nitrogen accumulation of stem and sheath, average nitrogen accumulation of cob and glume, average nitrogen accumulation of grain, average nitrogen transformation amount, average nitrogen transformation rate and average contribution rate of nitrogen transformation to grain by 20.19%, 27.65%, 35.99%, 47.51%, 20.91%, 6.04%, respectively. In two consecutive years, compared with W1N1 treatment, W3N2 and W3N3 treatment increased average wheat yield by 31.88% and 15. 28%, respectively. In conclusion, the W3N2 treatment was the best in the drip fertigation, which was applied to wheat with 240 kg/hm2 pure nitrogen, 60% pure nitrogen was applied at the bottom, 25% of pure nitrogen was added at the jointing stage and 15% of pure nitrogen was added at the filling stage, respectively, and three times irrigation at the jointing stage, flowering stage and filling stage under the drip fertigation, which could promote the accumulation and translocation of dry matter and nitrogen of vegetative organs, so as to promote the high-yield and high-efficient wheat. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Nitrogen fertilizers
Controlled terms: Grain (agricultural product)? - ?Irrigation
Uncontrolled terms: Contribution rate? - ?Dry matter accumulation? - ?Fertilizer levels? - ?Field experiment? - ?Flowering stage? - ?Nitrogen accumulation? - ?Nitrogen transformations? - ?Vegetative organs
Classification code: 804 Chemical Products Generally? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products
Numerical data indexing: Percentage 1.33e+01%, Percentage 1.50e+01%, Percentage 2.02e+01%, Percentage 2.03e+01%, Percentage 2.09e+01%, Percentage 2.20e+01%, Percentage 2.50e+01%, Percentage 2.76e+01%, Percentage 2.80e+01%, Percentage 3.19e+01%, Percentage 3.21e+01%, Percentage 3.60e+01%, Percentage 4.29e+01%, Percentage 4.75e+01%, Percentage 4.87e+01%, Percentage 5.63e+01%, Percentage 6.00e+01%, Percentage 6.04e+00%
DOI: 10.6041/j.issn.1000-1298.2021.02.026
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
8. Design and Test of Portable Red Globe Grape Extraction Multi-quality Visible/Near Infrared Detector
Accession number: 20211110089028
Title of translation: /
Authors: Gao, Sheng (1, 2); Wang, Qiaohua (1, 2); Shi, Hang (1, 2); Li, Qingxu (1, 2)
Author affiliation: (1) College of Engineering, Huazhong Agricultural University, Wuhan; 430070, China; (2) Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture and Rural Affaris, Wuhan; 430070, China
Corresponding author: Wang, Qiaohua(wqh@mail.hzau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 308-319
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Based on the visible/near infrared diffuse reflectance spectroscopy technology, a portable nondestructive detector for red globe grape extraction multi-quality parameters in growth period was designed. The instrument included a spectrum acquisition probe, a spectrometer, a halogen lamp light source, a lithium battery, a controller and peripheral circuits. The size of the whole instrument was 200 mm×160 mm×150 mm, which was convenient to carry. The red globe grape extracted fruit grains in the growing period were selected as research objects, and visible/near infrared diffuse reflectance spectral information in the range of 400 nm to 1 000 nm was collected, the original spectrum was preprocessed and the characteristic wavelength was extracted, and the optimal partial least squares regression (PLSR) prediction models of SSC, total acid, pH value, firmness and moisture content of red globe grape extracted fruits were respectively established. The correlation coefficients of the prediction set of the optimal PLSR prediction model for each index were 0.954 5, 0.977 8, 0.987 8, 0.945 6 and 0.902 8, respectively, and the root mean square error was 1.012 2°Brix, 2.022 5%, 0.074 7, 7.281 3 N and 0.979 9%, respectively. Based on MFC development tools, instrument real-time analysis and processing software was written by C++ language, and the optimal PLSR prediction model with multiple quality parameters of red globe grape extract was implanted into hardware device, thus realizing one-touch non-destructive detection of multiple quality parameters of red globe grape extract during growth period. After inspection and testing, the predicted set and correlation coefficient of SSC, total acid, pH value, firmness and moisture content of red globe grape extracted fruit grains of the tester were 0.941 4, 0.968 7, 0.976 8, 0.934 8 and 0.900 6, respectively. The root mean square error of the prediction set was 1.156 7°Brix, 2.364 5%, 0.098 6, 8.357 1 N and 1.105 1%, respectively. And the primary detection time of the detector was less than 2 s. The results show that the instrument can realize the real-time nondestructive detection of red globe grape fruits during the growing period. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Predictive analytics
Controlled terms: C++ (programming language)? - ?Computer software? - ?Extraction? - ?Forecasting? - ?Fruits? - ?Least squares approximations? - ?Light sources? - ?Lithium batteries? - ?Lithium metallography? - ?Mean square error ? - ?Moisture? - ?Moisture determination? - ?pH? - ?Reflection? - ?Spectrometers
Uncontrolled terms: Correlation coefficient? - ?Diffuse reflectance spectroscopy? - ?Nondestructive detection? - ?Partial least squares regressions (PLSR)? - ?Processing software? - ?Root mean square errors? - ?Spectral information? - ?Visible/near infrared
Classification code: 531.2 Metallography? - ?702.1.1 Primary Batteries? - ?723 Computer Software, Data Handling and Applications? - ?723.1.1 Computer Programming Languages? - ?741.3 Optical Devices and Systems? - ?801.1 Chemistry, General? - ?802.3 Chemical Operations? - ?821.4 Agricultural Products? - ?921.6 Numerical Methods? - ?922.2 Mathematical Statistics? - ?944.2 Moisture Measurements
Numerical data indexing: Size 4.00e-07m to 1.00e-06m, Time 2.00e+00s
DOI: 10.6041/j.issn.1000-1298.2021.02.030
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
9. Estimation of Nitrogen Content in Walnut Canopy Based on UAV Remote Sensing Image
Accession number: 20211110088877
Title of translation:
Authors: Wang, Xinmei (1); Zhang, Jinsong (1); Meng, Ping (1); Yang, Hongguo (2); Sun, Sheng (1)
Author affiliation: (1) Research Institute of Forestry, Chinese Academy of Forestry, Beijing; 100091, China; (2) Collaborative Innovation Center of Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing; 210037, China
Corresponding author: Meng, Ping(mengping@caf.ac.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 178-187
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Leaf nitrogen content is an important index to evaluate the growth of vegetation. It is of great significance to understand the change of nitrogen content in walnut canopy quickly, efficiently and accurately, so as to control the growth of trees in time and implement precise management. Taking the expanding period of walnut fruit as an example, the hyperspectral remote sensing image data of 5-year-old walnut forest land was obtained by GS-2 imaging spectrometer on the low altitude UAV remote sensing platform. The ENVI 5.3 software was used to identify and extract the walnut, soil and shadow in the observation range, and according to the spectral differences of different objects to find the non-intersection and large difference band between walnut, soil and shadow to determine the canopy range, and verify its extraction accuracy through support vector machine method. According to the NDVI, RVI and DVI vegetation indexes, the characteristic sensitive bands indicating the nitrogen content of the canopy were screened, and the correlation and estimation ability of 9 spectral parameters with the nitrogen content of the walnut canopy. Using the screened feature-sensitive bands as input variables of BP neural network model, the nitrogen content of walnut canopy was estimated. The screened feature-sensitive bands was used as the input variable of BP neural network model to estimate the nitrogen content of walnut canopy. The results showed that when the spectral reflectance at B100(550.7) was more than 0.10 and that at B233(779.4) was more than 0.70, the canopy range of walnut could be identified and determined effectively. Its drawing accuracy was as high as 96. 43%. Based on the correlation between nitrogen content in walnut canopy and NDVI, RVI and DVI vegetation indexes, B33(440.6), B165(660.7), B186(697.0) and B347(986. 4) were determined as the characteristics of indicating nitrogen content sensitive band. The estimation models based on the three reconstructed vegetation indices NDVI(986.4, 697.0), RVI(986.4, 697.0), and DVI(660. 7, 440.6) all reached extremely significant levels. Among them, NDVI(986.4, 697.0) constructed by two bands of B347(986.4) and B186(697.0) was more close to the measured value in the diagnosis of nitrogen content in walnut forest canopy, and the accuracy of the estimation model was the highest. The estimation model based on BP neural network had higher estimation accuracy than the nine spectral parameters, the R2 of verification reached 0.805. The estimation model had the highest accuracy and certain estimation reliability. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 40
Main heading: Parameter estimation
Controlled terms: Backpropagation? - ?Forestry? - ?Hyperspectral imaging? - ?Neural networks? - ?Nitrogen? - ?Remote sensing? - ?Support vector machines? - ?Unmanned aerial vehicles (UAV)? - ?Vegetation
Uncontrolled terms: BP neural network model? - ?Hyperspectral Remote Sensing Image? - ?Imaging spectrometers? - ?Leaf nitrogen content? - ?Spectral differences? - ?Spectral parameters? - ?Spectral reflectances? - ?Support vector machine method
Classification code: 652.1 Aircraft, General? - ?723 Computer Software, Data Handling and Applications? - ?723.4 Artificial Intelligence? - ?804 Chemical Products Generally
Numerical data indexing: Age 5.00e+00yr, Percentage 4.30e+01%
DOI: 10.6041/j.issn.1000-1298.2021.02.016
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
10. Design and Experiment on Shoveling Device of Pig Manure Organic Fertilizer by Hermetia illucen Transforming Based on Bucket-wheel Mechanism
Accession number: 20211110087210
Title of translation:
Authors: Peng, Caiwang (1); He, Xi (2); Sun, Songlin (1); Song, Shisheng (1); Xiang, Yang (1); Xu, Daojun (3)
Author affiliation: (1) College of Engineering, Hunan Agricultural University, Changsha; 410128, China; (2) College of Animal Science and Technology, Hunan Agricultural University, Changsha; 410128, China; (3) School of Veterinary Medicine, Hunan Agricultural University, Changsha; 410128, China
Corresponding author: Sun, Songlin(hnndssl@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 145-156
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the problems of high labor intensity in the collection and transportation forpig manure organic fertilizer by Hermetia illucen transforming, based on the process flow of Hermetia illucen breeding and the physical characteristics of organic fertilizer, a bucket-wheel shoveling device was designed. To improve the mean mass shoveled by hopper and reduce the coefficient of variation between each hopper, single-factor test was used to get the best form of the bucket-wheel mechanism. The Box-Behnken central composite experimental design principle was adopted on the basis of single factor experiment to research the working parameters of the shoveling device. The moving speed of bucket-wheel, rotation speed of hopper, and number of the hopper were taken as the influencing factors, the mean mass of organic fertilizer shoveled by thehopper and coefficient of variation were selected as the responsive variables. The results showed that the mean mass of organic fertilizer shoveled by the hopper and coefficient of variation could be fitted with two regression polynomials. According to the rate of factors contribution, the results indicated that the rotation speed of hopper had the greatest effect on the mean mass of organic fertilizer shoveled by the hopper and coefficient of variation among the three selected main factors followed by counterweight position, and moving speed of bucket-wheel had the minimum effect. Taking the maximum average mass of organic fertilizer shoveled by the hopper and the smallest coefficient of variation as the optimization goal, the optimal operating parameters of the machine was obtained: the moving speed of bucket-wheel was 65 mm/s, the rotation speed of hopper was 8.25 r/min and number of the hopper was 3. At this time, the theoretical values of mean mass of organic fertilizer shoveled by the hopper and coefficient of variation were 4.008 kg and 3.19%, respectively. Based on the optimization result, the physical prototype was processed. The test results showed that the mean mass of organic fertilizer shoveled by the hopper and coefficient of variation were 4.236 kg and 3.37%, respectively. The relative errors between the experimental and predicted values of average mass of organic fertilizer shoveled by the hopper and coefficient of variation were 5.38% and 5.34%, respectively. The results indicated that the multivariate regression model was reliable. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Fertilizers
Controlled terms: Design of experiments? - ?Hoppers? - ?Mammals? - ?Manures? - ?Polynomial regression? - ?Speed? - ?Wheels
Uncontrolled terms: Coefficient of variation? - ?Multivariate regression models? - ?Operating parameters? - ?Organic fertilizers? - ?Physical characteristics? - ?Regression polynomials? - ?Single-factor experiments? - ?Theoretical values
Classification code: 601.2 Machine Components? - ?691.1 Materials Handling Equipment? - ?804 Chemical Products Generally? - ?821.5 Agricultural Wastes? - ?901.3 Engineering Research
Numerical data indexing: Mass 4.01e+00kg, Mass 4.24e+00kg, Percentage 3.19e+00%, Percentage 3.37e+00%, Percentage 5.34e+00%, Percentage 5.38e+00%, Rotational_Speed 8.25e+00RPM, Velocity 6.50e-02m/s
DOI: 10.6041/j.issn.1000-1298.2021.02.013
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
11. Real-time Semantic Segmentation of Sheep Skeleton Image Based on Generative Adversarial Network and ICNet
Accession number: 20211110088465
Title of translation: ICNet
Authors: Zhao, Shida (1); Wang, Shucai (1, 2); Bai, Yu (1); Hao, Guangzhao (1); Tu, Benshuai (1)
Author affiliation: (1) College of Engineering, Huazhong Agricultural University, Wuhan; 430070, China; (2) Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture and Rural Affairs, Wuhan; 430070, China
Corresponding author: Wang, Shucai(wsc01@mail.hzau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 329-339 and 380
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Using computer vision technology to accurately and quickly identify the neck, ribs and spine of the sheep skeleton is the key to the development of a vision system for the slaughter and segmentation robot. To this end, the sheep skeleton image generation technology and the ICNet-based real-time semantic segmentation method of the sheep skeleton image were studied. DCGAN, SinGAN and BigGAN, three kinds of generation confrontation network were used to generate image effect comparison, BigGAN was selected to generate sheep skeleton image and expand the amount of sheep skeleton image data. On this basis, the generated image and the original image were combined to establish a combined data set, and then transfer learning was introduced to train ICNet and save the optimal model to obtain the segmentation accuracy of the model for the three parts of the sheep skeleton, MIoU and the average processing time of a single image, and it was taken as the criterion for the effect of semantic segmentation of sheep skeleton images, in the end, the optimal model’s segmentation accuracy and MIoU for the three parts of the sheep skeleton were 93.68%, 96.37%, 89.77%, and 85.85%, 90.64%, 75.77%, and the average processing time for a single image was 87 ms. Then, the sheep skeleton images under different lighting conditions were simulated to judge the generalization ability of ICNet. Finally, comparing with the commonly used U-Net, DeepLabV3, PSPNet, Fast-SCNN four image semantic segmentation models to verify ICNet’s comprehensive segmentation ability, and the optimal weight was found by comparing the network segmentation accuracy under different weights of the middle resolution branch. The test results showed that the segmentation accuracy and MIoU of ICNet and the first three models were not much different, but the processing time was reduced by 72.98%, 40.82% and 88.86%. In addition, Fast-SCNN single image processing time was 43.68% higher than that of ICNet, but the MIoU was reduced by 4.5 percentage points and the resolution branch weight was 0.42, ICNet segmentation accuracy reached the highest. Combined with the experimental results, it was showed that this method had high segmentation accuracy and good real-time performance, the comprehensive segmentation ability was the best, and it had a certain generalization ability. The above research provided theoretical support and technical support for the research and development of the intelligent segmentation robot vision system for sheep skeleton. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Image segmentation
Controlled terms: Computer vision? - ?Musculoskeletal system? - ?Robots? - ?Semantic Web? - ?Semantics? - ?Transfer learning
Uncontrolled terms: Adversarial networks? - ?Computer vision technology? - ?Generalization ability? - ?Intelligent segmentation? - ?Real time performance? - ?Research and development? - ?Segmentation accuracy? - ?Semantic segmentation
Classification code: 461.3 Biomechanics, Bionics and Biomimetics? - ?723 Computer Software, Data Handling and Applications? - ?723.5 Computer Applications? - ?731.5 Robotics? - ?903 Information Science
Numerical data indexing: Percentage 4.08e+01%, Percentage 4.37e+01%, Percentage 7.30e+01%, Percentage 7.58e+01%, Percentage 8.58e+01%, Percentage 8.89e+01%, Percentage 8.98e+01%, Percentage 9.06e+01%, Percentage 9.37e+01%, Percentage 9.64e+01%, Time 8.70e-02s
DOI: 10.6041/j.issn.1000-1298.2021.02.032
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
12. Design of Planter Mechanical Clutch Based on Principle of Reuleaux Polygon
Accession number: 20211110087250
Title of translation:
Authors: Shi, Naiyu (1); Chen, Haitao (1); Zou, Zhen (1); Wei, Zhipeng (1); Zhang, Yanlong (1); Zhu, Yifan (1)
Author affiliation: (1) College of Engineering, Northeast Agricultural University, Harbin; 150030, China
Corresponding author: Chen, Haitao(htchen@neau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 64-74
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The ground wheel provides power for the seeding unit when the planter is working. In the turning and transportation state of the field, the traction planter can adjust the ground wheel to separate the seeding unit from the seed bed. At the same time, the ground wheel is used as a walking wheel. The device cuts off the ground wheel power to stop seeding. The mechanical clutch device has the advantages of strong environmental adaptability and high reliability. Due to the large amount of dust during the planting season, traditional planters mostly use mechanical clutch devices, and they are mainly divided into two types: jaw type and friction type. But compared with the electronically controlled clutch device, the mechanical clutch device has a longer power switching stroke, resulting in a lag in power switching. Based on the comprehensive analysis of the existing research results and methods, a mechanical clutch device was designed based on Reuleaux polygon principle to solve the problems of long power switching stroke and large instantaneous impact load of traditional jaw clutch device. Through theoretical analysis, the key structure of the clutch device was designed, the response speed of the clutch device and the instantaneous impact load of power coupling were simulated and analyzed through virtual simulation technology. Using the three-factor and three-level orthogonal test method, the seeding unit was used as the carrier, the axial inclination angle, gear radius ratio and operating speed were taken as test factors, and the power engagement and cut-off lag distance as test evaluation indicators, which were related to the performance of the clutch device. Parameters were tested and optimized. The test results showed that for the power engagement lag distance Yl, the axial inclination angle had a significant impact on it (P2, the three factors had significant effects on it (0.01 ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Seed
Controlled terms: Agricultural robots? - ?Clutches? - ?Switching? - ?Wheels
Uncontrolled terms: Comprehensive analysis? - ?Environmental adaptability? - ?High reliability? - ?Inclination angles? - ?Orthogonal test method? - ?Parameter combination? - ?Technical support? - ?Virtual simulations
Classification code: 601.2 Machine Components? - ?602.2 Mechanical Transmissions? - ?821.4 Agricultural Products
Numerical data indexing: Percentage 4.55e+01%, Percentage 8.24e+01%, Size 1.20e-02m, Size 6.00e-03m, Velocity 5.00e+00m/s
DOI: 10.6041/j.issn.1000-1298.2021.02.006
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
13. Design and Experiment of Multi-stage Separation Buffer Potato Harvester
Accession number: 20211110087183
Title of translation:
Authors: Zhang, Zhaoguo (1, 2); Wang, Haiyi (1, 2); Li, Yanbin (1, 2); Yang, Xi (1, 2); Ibrahim, Issa (1, 2); Zhang, Zhendong (1, 2)
Author affiliation: (1) College of Agriculture and Food, Kunming University of Science and Technology, Kunming; 650500, China; (2) Research Center on Mechanization Engineering of Chinese Medicinal Materials in Yunnan University, Kunming; 650500, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 96-109
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 poor separation effect, low potato-exposing rate, high damaged and bruising rate of potato mechanized harvesting under the clay in southwest mountainous area, a multi-stage separation buffer potato harvester was designed by adopting the methods of multi-stage separation vibration, multiple buffering and low-level side output. On the basis of expounding the overall structure of the machine, the design features of the main components and the operational principle, the structural parameters of the key components, such as the excavating mechanism, the multi-stage separation buffer device and the active vibration device, were determined through theoretical calculations. The motion model of potato and soil in throwing separation stage was established to obtain the technical characteristics of micro-wave potato soil separation. The potato sliding model of sieve surface and the theoretical analysis of potato tuber motion characteristics was carried out, and the motion law of potato tube downstream and back flow was obtained. The collision characteristics of soil blocks during transportation and separation were analyzed to determine the influencing factors of separation and crushing effect. In order to obtain the optimal speed parameters of each stage of separation screen in field test, taking impurity content and soil coverage as the test index, the quadratic rotary orthogonal combination experiment design method was adopted in no-load test. The real-time distribution and motion law of soil on separating sieve were obtained by using high-speed photography and three-axis attitude sensor. And the results showed that when the linear speed of the first-stage separating sieve and the second-stage separating sieve were 1.42 m/s and 2.2 m/s, and the linear speed of side output was 1 m/s, the soil coverage was 69.11% and the impurity content was 2.56%. Under the condition of the optimal speed parameters, taking the potato-exposing rate, bruising and damaged rate as the test index, the orthogonal harvest experiment was carried out in the field. The results showed that when the working parameters were as follows: working speed was 1.05 m/s, digging depth was 180 mm, vibration strength was grade and inclination angle on the sieve surface was 22°, the obvious potato rate was 99.1%, the bruising rate was 1.41%, and the damaged rate was 1.32%, which were superior to national industry standards. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: High speed photography
Controlled terms: Design? - ?Harvesters? - ?Load testing? - ?Sieves? - ?Soils? - ?Speed
Uncontrolled terms: Excavating mechanisms? - ?Mechanized harvesting? - ?Motion characteristics? - ?Multi-stage separation? - ?Operational principles? - ?Real time distribution? - ?Structural parameter? - ?Theoretical calculations
Classification code: 483.1 Soils and Soil Mechanics? - ?742.1 Photography? - ?821.1 Agricultural Machinery and Equipment
Numerical data indexing: Percentage 1.32e+00%, Percentage 1.41e+00%, Percentage 2.56e+00%, Percentage 6.91e+01%, Percentage 9.91e+01%, Size 1.80e-01m, Velocity 1.00e+00m/s, Velocity 1.05e+00m/s, Velocity 1.42e+00m/s, Velocity 2.20e+00m/s
DOI: 10.6041/j.issn.1000-1298.2021.02.009
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
14. Design and Test on Centralized Metering Seed Feeding Device of Air-assisted Planter for Rapeseed
Accession number: 20211110088447
Title of translation:
Authors: Wang, Lei (1, 2); Liao, Yitao (1, 2); Liao, Qingxi (1, 2); Qi, Tianxiang (1, 2); Zhang, Qingsong (1, 2); Wang, Baoshan (1, 2)
Author affiliation: (1) College of Engineering, Huazhong Agricultural University, Wuhan; 430070, China; (2) Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture and Rural Affairs, Wuhan; 430070, China
Corresponding author: Liao, Yitao(liaoetao@mail.hzau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 75-85
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Considering the problem that the large range of land slope changes in rapeseed planting area leads to the seed feeding quantity insufficient stability of the seed feeding device of air-assisted centralized metering device of the planter, a prototype of seed feeding device was developed to improve the stability of seed feeding quantity in slope land planting based on adjusting spring to adjust the distance between seed cleaning brush and circular arc type-hole wheel for controlling feeding and cleaning seed quantity. The working process and principle of the seed feeding device were elaborated. The curvilinear equation of the circular arc type-hole, main arc deflection angle, and structural parameters of seed quantity regulating mechanism was determined. The mechanical relationship between seed quantity regulating mechanism and type-hole wheel was analyzed. Using the intelligent planting machine test platform, the influence experiment of land slope on seed feeding performance was carried out. The influence of seed cleaning brush thickness, adjusting spring effective turns, adjusting plate thickness, and main arc deflection angle on stability of seed feeding quantity in land slope was tested with quadratic rotation orthogonal combination test. The experiment results indicated that using the main objective method in multi-objective optimization, when the seed cleaning brush thickness was 13 mm, the adjusting spring effective turns was 82.5, the adjusting plate thickness was 7.8 mm, and the main arc deflection angle was 7.7°, the variation of seed feeding rate at 5° tilt was 2. 32% compared with no tilt, the variation of seed feeding rate at -5° tilt was 4.29% compared with no tilt, the variation coefficient of seed feeding rate stability was no higher than 0.52%, and the seed feeding stability was better. The bench test results showed that on the relatively flat land with variation of seed feeding rate in the state of oscillation in range of -5° to 5° relative to no tilt was no higher than 1.6%, the variation coefficient of seed feeding rate stability was no higher than 0.86% under the optimum combination of parameters. It could meet the requirement of seed feeding quantity stability in the land slope field planting. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Feeding
Controlled terms: Air cleaners? - ?Cleaning? - ?Multiobjective optimization? - ?Oilseeds? - ?Plates (structural components)? - ?Slope stability? - ?Wheels
Uncontrolled terms: Design and tests? - ?Mechanism and types? - ?Metering devices? - ?Objective methods? - ?Optimum combination? - ?Structural parameter? - ?Variation coefficient? - ?Working process
Classification code: 406.2 Roads and Streets? - ?408.2 Structural Members and Shapes? - ?451.2 Air Pollution Control? - ?601.2 Machine Components? - ?691.2 Materials Handling Methods? - ?802.3 Chemical Operations? - ?821.4 Agricultural Products? - ?921.5 Optimization Techniques
Numerical data indexing: Percentage 1.60e+00%, Percentage 3.20e+01%, Percentage 4.29e+00%, Percentage 5.20e-01%, Percentage 8.60e-01%, Size 1.30e-02m, Size 7.80e-03m
DOI: 10.6041/j.issn.1000-1298.2021.02.007
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
15. Soil Moisture Measurement Sensor Research in Seeding Ditch Based on VIS-NIR
Accession number: 20211110088440
Title of translation: VIS-NIR
Authors: Zhang, Dongxing (1, 2); Liu, Jiang (1, 2); Yang, Li (1, 2); Cui, Tao (1, 2); He, Xiantao (1, 2); Zhang, Tianliang (1, 2)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Key Laboratory of Soil-Machine-Plant System Technology, Ministry of Agriculture and Rural Affairs, Beijing; 100083, China
Corresponding author: He, Xiantao(hxt@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 218-226
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Soil moisture content (SMC) plays a vital role in seed germination and crop growth. It is of great significance for precision agriculture to acquire the SMC of seed-dropping point in planting for the sake of decision-making and depth-regulating of seeding. Thus, developing a proper SMC sensor will contribute a lot to precision agriculture. An SMC sensor was designed by using visible and near-infrared (VIS-NIR) light source. The spectral data of soil samples was collected by a high-resolution spectrometer, then the partial least squares regression (PLSR) was used for determining the optimal pretreatment method, and various dimensionality reduction methods were employed to select the characteristic wavelengths of soil moisture. It was concluded that the sensitive reflectance bands of different SMC within 400~1 000 nm were around 410 nm, 540 nm, 780 nm and 970 nm. Through the modeling analysis of combinations of two of these four wavelengths, the optimal wavelengths of VIS-NIR light sources for prediction were selected as 410 nm and 970 nm, respectively. The results of experiments conducted in the laboratory showed that when the distance between the sensor and the measured soil surface was under 3 mm, within the range of 0.69%~28.45% SMC, the predicted and the measured values appeared a justified linear correlation for which the coefficient of determination (R2) was 0.81 while the root mean square error (RMSE) was 2.90%; within the range of 0.69%~22% SMC, the R2 of the linear model reached 0.93 and the RMSE was decreased to 1.72%. The factorial test indicated that temperature and light scarcely had influence on the SMC sensor at 0.05 level. The results of simulated field tests indicated that rocks and the process of acquire soil sampling may generate outliers. The R2 of the linear correlation reached 0.82 and the RMSE was 1.23% after the outliers were excluded, which met the requirement of SMC detection in most conditions of precision agriculture such as maize planting. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Soil surveys
Controlled terms: Agricultural robots? - ?Decision making? - ?Dimensionality reduction? - ?Infrared devices? - ?Least squares approximations? - ?Light sources? - ?Mean square error? - ?Moisture control? - ?Moisture determination? - ?Precision agriculture ? - ?Seed? - ?Soil moisture? - ?Statistics
Uncontrolled terms: Coefficient of determination? - ?Dimensionality reduction method? - ?High-resolution spectrometer? - ?Partial least squares regressions (PLSR)? - ?Pretreatment methods? - ?Root mean square errors? - ?Soil moisture measurement? - ?Visible and near infrared
Classification code: 483.1 Soils and Soil Mechanics? - ?821.4 Agricultural Products? - ?912.2 Management? - ?921.6 Numerical Methods? - ?922.2 Mathematical Statistics? - ?944.2 Moisture Measurements
Numerical data indexing: Percentage 1.23e+00%, Percentage 1.72e+00%, Size 3.00e-03m, Size 4.00e-07m to 1.00e-06m, Size 4.10e-07m, Size 5.40e-07m, Size 7.80e-07m, Size 9.70e-07m
DOI: 10.6041/j.issn.1000-1298.2021.02.020
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
16. Design and Experiment of Bionic Rotary Blade Based on Claw Toe of Gryllotalpa orientalis Burmeister
Accession number: 20211110087953
Title of translation:
Authors: Xiao, Maohua (1); Wang, Kaixin (1); Yang, Wang (2); Wang, Weichen (1); Jiang, Feng (1)
Author affiliation: (1) College of Engineering, Nanjing Agricultural University, Nanjing; 210031, China; (2) College of Mechanical Engineering, Guangxi University, Nanning; 530004, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 55-63
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Field rotary tillage is an important part of the agricultural production process. In order to reduce the energy consumption during rotary blade farming, based on the characteristics of the contour fitting curves of the forefoot toes of Gryllotalpa orientalis Burmeister, using reverse engineering technology, the contour curves of the first, second, third and fourth claw toes of the forefoot were arranged in sequence on the cutting edge and the end edge of the gyration radius of the IT245 national standard rotary blade to design a bionic rotary blade. A soil-rotary blade interaction model of the southern clay-wet soil-blade was established to analyze the changes in torque and three-axis working resistance of the national standard and bionic rotary blade at different rotate speeds. Combined with the indoor soil bin test, the trend of the torque on the tool shaft was analyzed to verify the validity of the discrete element simulation model. The force simulation analysis of a single blade showed that the horizontal resistance, vertical resistance and lateral resistance of the national standard and bionic rotary blade were all gradually increased with the increase of speed. At three different rotate speeds, except for the lateral resistance, the maximum horizontal and vertical resistance of the bionic rotary blade were lower than that of the national standard rotary blade. Compared with the national standard rotary blade, when the rotate speed was at 150 r/min, 200 r/min and 250 r/min, the maximum horizontal resistance of the bionic rotary blade was reduced by 9.91%, 5.78% and 4.95%, respectively, and the vertical resistance of which was reduced by 9.09%, 9.74% and 6.38%, respectively. The soil bin torque test showed that the simulation and experimental values of the two rotary blades had the same changing trend. The torque was gradually increased as the increase of rotate speed, and the maximum relative error was up to 13.23%. Compared with the national standard rotary blade, when the rotate speed was at 150 r/min, 200 r/min and 250 r/min, the average torque of the bionic rotary blade was reduced by 10.53%, 4.46% and 3.49%, respectively. The research results can provide a certain reference for the analysis of drag reduction and energy consumption of the rotary blade. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 36
Main heading: Turbomachine blades
Controlled terms: Agricultural robots? - ?Agriculture? - ?Bionics? - ?Curve fitting? - ?Energy utilization? - ?Reverse engineering? - ?Soils? - ?Speed? - ?Torque
Uncontrolled terms: Agricultural productions? - ?Discrete element simulation? - ?Experimental values? - ?Gryllotalpa orientalis Burmeister? - ?Horizontal resistance? - ?Maximum relative errors? - ?Simulation analysis? - ?Vertical resistance
Classification code: 461.1 Biomedical Engineering? - ?483.1 Soils and Soil Mechanics? - ?525.3 Energy Utilization? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?921.6 Numerical Methods? - ?931.2 Physical Properties of Gases, Liquids and Solids
Numerical data indexing: Percentage 1.05e+01%, Percentage 1.32e+01%, Percentage 3.49e+00%, Percentage 4.46e+00%, Percentage 4.95e+00%, Percentage 5.78e+00%, Percentage 6.38e+00%, Percentage 9.09e+00%, Percentage 9.74e+00%, Percentage 9.91e+00%, Rotational_Speed 1.50e+02RPM, Rotational_Speed 2.00e+02RPM, Rotational_Speed 2.50e+02RPM
DOI: 10.6041/j.issn.1000-1298.2021.02.005
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
17. Detection of Moisture Content in Lettuce Canopy Based on Hyperspectral Imaging Technique
Accession number: 20211110088436
Title of translation:
Authors: Li, Hong (1); Zhang, Kai (1); Chen, Chao (1); Zhang, Zhiyang (1); Liu, Zhenpeng (1)
Author affiliation: (1) Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang; 212013, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 211-217 and 274
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to realize the non-destructive testing of crop moisture content, taking lettuces of six water stress levels as experimental objects, the canopy moisture content of lettuce was detected and studied by using hyperspectral imaging technology and characteristic band selection method. Firstly, by analyzing the spectral reflectance of the canopy leaves and the background area, there were significant differences in spectral reflectance at 810.0 nm and 710.7 nm wavelengths, respectively. Therefore, the images of these two wavelengths were used to construct the mask image, which was used to mask the original hyperspectral image to remove background information. Secondly, spectral normalization was used to correct the light intensity of lettuce canopy. Thirdly, the standard normal variable (SNV) was used to preprocess the original spectral curve to eliminate the influence of scattering caused by particles on the sample surface. Fourthly, the irrelevant information was eliminated by Monte Carlo uninformative variable elimination (MCUVE), and then the least absolute shrinkage and selection operator (LASSO), successive projections algorithm (SPA), the least absolute shrinkage and selection operator coupled with successive projections algorithm (LASSO-SPA) were used to extract the characteristic wavelengths for data dimensionality reduction. Combing partial least squares (PLS), five lettuce canopy moisture content detection models were established. The results showed that the PLS model established by the full spectrum had the highest complexity and the worst predictive ability, because there were many redundant information variables and irrelevant variables in the full spectrum. The effect of PLS model with input variables screened by MCUVE-LASSO-SPA was the best. At this time, the correlation coefficients(R) of the modeling set and prediction set were 0.882 7 and 0.901 5, and the root mean square error (RMSE) were 1.066 2 and 0.928 7, respectively. The MCUVE-LASSO-SPA-PLS model was selected to calculate the dry basis moisture content of each pixel of the lettuce canopy, and a visual distribution map was generated to realize the visual detection of the dry basis moisture content of the lettuce canopy leaves. The research results provided a reference for the rapid non-destructive detection of lettuce canopy moisture content. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Hyperspectral imaging
Controlled terms: Dimensionality reduction? - ?Least squares approximations? - ?Mean square error? - ?Microcontrollers? - ?Moisture? - ?Moisture determination? - ?Nondestructive examination? - ?Plants (botany)? - ?Reflection? - ?Regression analysis ? - ?Shrinkage? - ?Spectroscopy
Uncontrolled terms: Data dimensionality reduction? - ?Hyperspectral imaging technologies? - ?Least absolute shrinkage and selection operators? - ?Monte Carlo uninformative variable eliminations? - ?Nondestructive detection? - ?Partial least square (PLS)? - ?Successive projections algorithm? - ?Successive projections algorithms (SPA)
Classification code: 921.6 Numerical Methods? - ?922.2 Mathematical Statistics? - ?944.2 Moisture Measurements? - ?951 Materials Science
Numerical data indexing: Size 7.11e-07m, Size 8.10e-07m
DOI: 10.6041/j.issn.1000-1298.2021.02.019
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
18. Formation and Evolution Mechanism of Tip Leakage Vortex in Axial Flow Pump and Vortex Cavitation Analysis
Accession number: 20211110088939
Title of translation:
Authors: Zhang, Hu (1, 2); Zuo, Fengyuan (2); Zhang, Desheng (1); Shi, Weidong (3)
Author affiliation: (1) Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang; 212013, China; (2) School of Mechanical Technology, Wuxi Institute of Technology, Wuxi; 214121, China; (3) School of Mechanical Engineering, Nantong University, Nantong; 226019, China
Corresponding author: Zhang, Desheng(zds@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 157-167
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to grasp the formation and evolution mechanism of the tip leakage vortex of axial flow pump, and evaluate the influence of the cavitation condition of vortex formation and the gap width, an axial flow pump clearance leakage flow experiment and numerical calculation were carried out. The three-dimensional visualization of the gap flow characteristics and the vortex structure was obtained by applying the streamline vortex cloud diagram. The distribution of the velocity streamlines, vorticity and turbulent kinetic energy on the suction surface were analyzed as the vortex at the initial generation. The physical quantity distributions of different cross-sections were compared, and the relationship between cavitation development and TLV vortex strength was analyzed for different cavitation conditions. Results showed that the leakage shear zone was the main area of TLV formation, where the turbulent kinetic energy and vorticity were large. Convection formed by the axial mainstream and interstitial jets promoted the generation and development of vortices. The intensity and scale of vortices under large clearance were larger, accompanied by greater leakage velocity. The vortex in the core area of TLV came from the shear vortex formed by the shear zone and the circumferential incoming vortex. With a large cavitation number, the vortex and cavitation distribution were basically the same, the vortex strength was positively correlated with cavitation, and the tip vortex cavitation extended farther in the large gap. With a small cavitation number, the vortex and the cavitation position did not completely overlap, and the gap width had little effect on cavitation. Due to the lower environmental pressure, the vortex strength required for cavitation formation was smaller, so it was easy to form cavitation and expand to form sheet cavitation. The TLV vortex strength was increased along the leading edge of the blade, reaching the maximum near the trailing edge, while the average vortex strength was the largest at the leading edge of the blade, where cavitation occurred first. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Vortex flow
Controlled terms: Axial flow? - ?Cavitation? - ?Kinetic energy? - ?Kinetics? - ?Pumps? - ?Three dimensional computer graphics? - ?Vorticity
Uncontrolled terms: Cavitation conditions? - ?Environmental pressures? - ?Formation and evolutions? - ?Numerical calculation? - ?Physical quantities? - ?Three dimensional visualization? - ?Tip vortex cavitations? - ?Turbulent kinetic energy
Classification code: 618.2 Pumps? - ?631.1 Fluid Flow, General? - ?631.1.1 Liquid Dynamics? - ?723.2 Data Processing and Image Processing
DOI: 10.6041/j.issn.1000-1298.2021.02.014
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
19. Flavor Control of Soy Protein Isolate by GC-IMS
Accession number: 20211110089169
Title of translation:
Authors: Shi, Yuqiang (1); Liu, Xiqian (2); Li, Shunxiu (1); Ma, Jun (1); Liu, Jun (1); Qu, Lingling (1)
Author affiliation: (1) Shandong Yuwang Ecological Food Industry Co., Ltd., Yucheng; 251200, China; (2) Linyi Yuwang Protein Industry Co., Ltd., Linyi; 251500, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 355-363
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The flavor of soy protein isolate (SPI) is a key factor affecting its application range. In order to improve the flavor of soy protein isolate, especially to reduce unpleasant soybean flavors, and improve the pleasant soy flavor of soy protein isolate, gas chromatograph-ion mobility spectrometer was used to analyze the changes in the content of volatile organic compounds in soy protein isolate produced from different raw materials and different processing techniques. The study of raw materials showed that the SPI produced by soybeans with loss of lipoxygenase had significantly lower (E)-2-hexanoaldehyde and no hexanol, indicating that the lipoxidase was the key control enzyme for the generation of hexanol, and could significantly affect the production of hexenal. And the 2-furanmethanol, (E, E)-3, 5-octadien-2-one and maltol (which were considered to be the ingredient of pleasant soybean flavors) of SPI produced by DF3-variety were significantly higher than the other two varieties(DF1-variety was loss of lipoxygenase, KS1-variety had three kind of lipoxygenases). The study of enzymatic hydrolysis process showed that the main unpleasant soybean flavor substances in non-enzymatic samples, such as 2-pentyl furan and 1-pentanol were significantly higher than that of enzyme hydrolysis products, while the concentration of hexanol was slightly lower than that of enzyme hydrolysis products. Compared with the protease hydrolysis sample, the unpleasant soybean flavors (such as 2-pentyl furan, 1-pentanol, 1-Octen-3-ol, (E)-2-hexanoaldehyde and hexanol) produced by the two-step enzyme sample were significantly reduced, and the pleasant soybean flavors (such as benzaldehyde, phenylethanol, 2-furanmethanol, heptanal(dimer) (E, E)-3, 5-octadien-2-one and maltol) were also reduced. The study of degassing process showed that degassing twice process could promote the generation of some pleasant soybean flavors, and effectively reduce unpleasant soybean flavors. The study of grinding process showed that crushing process had disadvantages in flavor control, but improved the taste. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Flavor compounds
Controlled terms: Alcohols? - ?Aromatic compounds? - ?Degassing? - ?Enzymatic hydrolysis? - ?Gas chromatography? - ?Ion mobility spectrometers? - ?Organic pollutants? - ?Volatile organic compounds
Uncontrolled terms: Degassing process? - ?Enzyme hydrolysis? - ?Flavor substances? - ?Gas chromatographs? - ?Grinding process? - ?ITS applications? - ?Processing technique? - ?Soy protein isolates
Classification code: 741.3 Optical Devices and Systems? - ?802.3 Chemical Operations? - ?804.1 Organic Compounds? - ?822.3 Food Products
DOI: 10.6041/j.issn.1000-1298.2021.02.035
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
20. Design and Experiment of In-situ Fertilizer Mixing Integrated Digging and Backfilling Planter for Fruit Tree
Accession number: 20211110088950
Title of translation:
Authors: Yuan, Jin (1, 2); Yin, Ranguang (1); Liu, Gong (1); Liu, Xuemei (1, 3); Mao, Zhiquan (4)
Author affiliation: (1) College of Mechanical and Electronic Engineering, Shandong Agricultural University, Tai’an; 271018, China; (2) Shandong Provincial Key Laboratory of Horticultural Machinery and Equipment, Tai’an; 271018, China; (3) Shandong Agricultural Equipment Intelligent Engineering Laboratory, Tai’an; 271018, China; (4) College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an; 271018, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 110-121
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to avoid the obstacles of soil continuous cropping, it is necessary to mix the soil in the tree holes with the bacterial fertilizer to improve the survival rate of fruit trees. Aiming at the problems of poor quality of mixed fertilizer, separation of operation flow and high labor intensity in the process of fruit tree planting, an integrated fruit tree planting machine was developed. The key components were designed according to the requirements of planting agratics. The backfilling device of pit mixing fertilizer realized simultaneous excavation and fertilizer mixing, vertical pit feeding, fertilizer metering and discharge, and in-situ backfilling and watering. The length of each connecting rod of the lifting device was determined according to the in-situ operating distance. The plant operation control system developed realized automatic plant operation, and real-time adjustment of pit feeding amount based on PWM control according to the operation load characterized by oil pressure monitoring. Against the blending problem of less bacterial manure and more soil, the discrete element simulation was used to simulate mixing process of soil in the mixing chamber at different rotational speeds and mixing time, net-poles through the analysis of the relative standard deviation method in different depths, and soil mixture mixing evenness variation coefficient, and the best theory mixing operation parameters were got as follows: the speed was 250 r/min, and the mixing time was 14 s. The results of field validation test showed that the total time of single planting of the prototype was less than 3 min, the variation coefficient of mixing uniformity of the upper, middle and lower layers of the tree hole was not more than 16%, operating depth was adjustable from 0 mm to 400 mm, and diameter was 500 mm, all indexes of the prototype met the agronomic requirements of fruit tree planting. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Fertilizers
Controlled terms: Blending? - ?Fruits? - ?Orchards? - ?Pressure control? - ?Reforestation? - ?Soils
Uncontrolled terms: Bacterial fertilizer? - ?Discrete element simulation? - ?Field validation tests? - ?Mixing uniformities? - ?Operation parameters? - ?Relative standard deviations? - ?Rotational speed? - ?Variation coefficient
Classification code: 483.1 Soils and Soil Mechanics? - ?731.3 Specific Variables Control? - ?802.3 Chemical Operations? - ?804 Chemical Products Generally? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products
Numerical data indexing: Percentage 1.60e+01%, Rotational_Speed 2.50e+02RPM, Size 0.00e+00m to 4.00e-01m, Size 5.00e-01m, Time 1.40e+01s, Time 1.80e+02s
DOI: 10.6041/j.issn.1000-1298.2021.02.010
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
21. Analysis of One-dimensional Horizontal Absorption Characteristics and Water Movement Parameters of Magnetized Brackish Water
Accession number: 20211110089002
Title of translation:
Authors: Shan, Yuyang (1); Li, Xiaoju (1); Wang, Quanjiu (1, 2); Ma, Chenguang (1); Zhang, Jihong (1); Wei, Kai (1)
Author affiliation: (1) State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an; 710048, China; (2) State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling; 712100, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 266-274
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: It is the basis for revealing the mechanism of the effect of magnetized brackish water on soil water movement parameters to predict the water movement of magnetized brackish water in field. A one-dimensional horizontal soil column experiment was carried out to study the horizontal absorption characteristics of magnetized brackish water with different salinities (0.14 g/L, 2 g/L, 3 g/L, 4 g/L and 6 g/L) and its influence on soil water movement parameters. The results showed that the final cumulative infiltration and the depth of wetting front of magnetized brackish water were decreased significantly, while the average moisture content of the final wetted body was increased by 2.03%~6.11%. Magnetized brackish water infiltration could increase the soil water holding capacity, which was beneficial to improve the distribution of soil moisture. The absorption rate S in PHILIP infiltration model of magnetized brackish water was 7.71%~12.11% lower than that of unmagnetized brackish water, and the relationship between saturation conductivity Ks and relative saturation conductivity ΔKs of magnetized and unmagnetized brackish water and salinity of infiltration water was quadratic polynomial. After magnetization of brackish water, the shape coefficient n of BROOKS-COREY model was decreased relatively, while the suction hd was increased relatively. The soil water content that can be absorbed by the same soil water suction was increased, while the unsaturated conductivity and its growth rate were decreased. The saturated diffusivity Ds and the initial diffusivity soil water content were also increased. The results showed that the soil water movement parameters were changed in the process of magnetized brackish water infiltration, and its effect was closely related to the salinity of brackish water, which provided theoretical support and guidance for the rational use of magnetized brackish water irrigation. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Infiltration
Controlled terms: Soil moisture? - ?Water absorption? - ?Wetting
Uncontrolled terms: Absorption characteristics? - ?Cumulative infiltrations? - ?Infiltration modeling? - ?Quadratic polynomial? - ?Shape coefficients? - ?Soil water holdings? - ?Soil water movement? - ?Soil-column experiment
Classification code: 483.1 Soils and Soil Mechanics? - ?802.3 Chemical Operations
Numerical data indexing: Mass_Density 1.40e-01kg/m3, Mass_Density 2.00e+00kg/m3, Mass_Density 3.00e+00kg/m3, Mass_Density 4.00e+00kg/m3, Mass_Density 6.00e+00kg/m3
DOI: 10.6041/j.issn.1000-1298.2021.02.025
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
22. Design and Experiment on Belt-type Curl-up Film Device for Residual Plastic Film Recycling Machine
Accession number: 20211110088991
Title of translation:
Authors: Yang, Songmei (1); Chen, Xuegeng (2); Yan, Limin (2); Mo, Yisong (3); Jiang, Deli (2); Zhang, Huiming (1)
Author affiliation: (1) College of Mechanical and Electrical Engineering, Hainan University, Haikou; 570228, China; (2) College of Mechanical and Electrical Engineering, Shihezi University, Shihezi; 832003, China; (3) Changzhou Han-Sun Machinery Co., Ltd., Changzhou; 213034, China
Corresponding author: Yan, Limin(86002528@qq.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 135-144
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Collecting operation is the last step of residual plastic film recovery. Most of the existing residual plastic film collectors collect residual plastic film by collecting box, which is not conducive to storage and transportation, and easy to cause secondary pollution. In order to solve the problems of loose texture and low efficiency in the process of residual plastic film collecting and unloading, a belt-type curl-up film device which could realize film curling up and automatic film unloading was designed. The belt-type curl-up film device of the residual plastic film recycling machine introduced coiled the residual plastic film into a film coil with a certain compactness, which solved the above problems. Through the design and analysis of the key components of the curl-up film device, the driving form of the curl-up film belt, the selection of air spring and other structure and operation parameters was determined. At the same time, the operation process of curling up film was analyzed, and the diameter range of the residual plastic film coil and the curl-up angle range were obtained. The hydraulic system of flip-unload film was designed for automatic film unloading. The mathematical model between the key parameters and the residual plastic film coil density was established by using the three factors and three levels Box-Behnken test design method. The optimal combination of the motion parameters of the belt-type curl-up film device was determined as follows: the forward speed of the unit was 5.38 km/h, the curl up speed ratio was 1.19, the curl up angle was 80°, the average coil density was 122.7 kg/m3, and the average time of film unloading and resetting was 33 s. The field test indicated that the operation performance of the belt-type curl-up film device was stable and the quality of the film coil was good, which met the design and practical operation requirements. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Plastic recycling
Controlled terms: Belts? - ?Collector efficiency? - ?Design? - ?Hydraulic equipment? - ?Plastic films? - ?Structure (composition)? - ?Textures? - ?Unloading
Uncontrolled terms: Design and analysis? - ?Motion parameters? - ?Operation parameters? - ?Operation performance? - ?Operation process? - ?Optimal combination? - ?Secondary pollution? - ?Storage and transportations
Classification code: 602.1 Mechanical Drives? - ?632.2 Hydraulic Equipment and Machinery? - ?691.2 Materials Handling Methods? - ?702.3 Solar Cells? - ?817.1 Polymer Products? - ?951 Materials Science
Numerical data indexing: Mass_Density 1.23e+02kg/m3, Time 3.30e+01s, Velocity 1.49e+00m/s
DOI: 10.6041/j.issn.1000-1298.2021.02.012
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
23. Starting Control Method for Power Shift Tractor Employing Time-varying Disturbance Rejection
Accession number: 20211110088932
Title of translation:
Authors: Fu, Shenghui (1, 2); Yang, Zihan (1, 2); Du, Yuefeng (1, 2); Li, Zhen (1, 2); Mao, Enrong (1, 2); Zhu, Zhongxiang (1, 2)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment, China Agricultural University, Beijing; 100083, China
Corresponding author: Mao, Enrong(gxy15@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 371-380
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Due to the complex starting conditions of the power shift tractor, there are many problems such as modeling uncertainty, parameter perturbation and time-varying disturbance in the system. Therefore, a novel starting control method employing the time-varying disturbance rejection was proposed to improve the starting performance of the power shift tractor and the drivers’ operating comfort. Firstly, the power shift transmission (PST) starting dynamic model was established by analyzing the dynamic characteristics of the starting process. Using the starting jerk and slipping friction work as the evaluation indicators to construct the performance function of the controller. Then a high-order disturbance observer (HDO) was introduced to estimate the time-varying disturbance and its derivatives in the starting process. The linear quadratic regulator (LQR) was used to obtain the optimal starting control law. The results of numerical calculation showed that HDO could effectively estimate the time-varying disturbance, and it could effectively suppress the influence of the disturbance and improve the robustness of the system combining with LQR. Finally, a co-simulation model of high-power tractor driveline was built based on Matlab/Simulink and AMESim, and proportional integral observer (PIO) was introduced as the comparison to verify the effectiveness of the starting control strategy. Taking 60% throttle as the example, the results showed that the maximum starting jerk by HDO were 12.25 m/s3 and 11.32 m/s3 in transportation and ploughing conditions, respectively, which were 21.92% and 22.20% lower than that by LQR, respectively. Besides, the slipping friction work by HDO were 0.49 kJ and 0.11 kJ lower than that by LQR in transportation and ploughing conditions, respectively. In different starting intentions and working conditions, the proposed method could effectively reduce the starting jerk and friction work of the power shifting tractor during the starting process, and had better starting quality and control robustness. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 23
Main heading: Time varying control systems
Controlled terms: Disturbance rejection? - ?Friction? - ?MATLAB? - ?Quality control? - ?Robustness (control systems)? - ?Tractors (agricultural)? - ?Tractors (truck)? - ?Two term control systems? - ?Uncertainty analysis
Uncontrolled terms: Dynamic characteristics? - ?Evaluation indicators? - ?Linear quadratic regulator? - ?Numerical calculation? - ?Parameter perturbation? - ?Performance functions? - ?Proportional-integral observers? - ?Time-varying disturbance
Classification code: 663.1 Heavy Duty Motor Vehicles? - ?731 Automatic Control Principles and Applications? - ?731.1 Control Systems? - ?913.3 Quality Assurance and Control? - ?921 Mathematics? - ?922.1 Probability Theory
Numerical data indexing: Energy 1.10e+02J, Energy 4.90e+02J, Percentage 2.19e+01%, Percentage 2.22e+01%, Percentage 6.00e+01%
DOI: 10.6041/j.issn.1000-1298.2021.02.037
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
24. Design and Experiment of Low-resistance Soil Loosening Shovel for Cutting Roots and Reseeding in Perennial Alfalfa Field
Accession number: 20211110088884
Title of translation:
Authors: Ma, Wenpeng (1); You, Yong (1); Wang, Decheng (1); Hu, Jianing (2); Huan, Xiaolong (1); Zhu, Lu (1)
Author affiliation: (1) College of Engineering, China Agricultural University, Beijing; 100083, China; (2) Shijiazhuang Xinnong Machinery Co., Ltd., Shijiazhuang; 052460, China
Corresponding author: Wang, Decheng(wdc@cau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 86-95 and 144
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to reduce the tillage resistance and soil disturbance of the multipurpose machine for improving perennial alfalfa field, a new type of bionic ripper was designed based on the contour curve model of the outer edge of the anteater’s claw toe. Based on the soil characteristics of the perennial artificial alfalfa field, the discrete element model of the soil contact part-soil interaction was established by using EDEM software. The forward resistance and soil disturbance area were used as the main evaluation indicators. The bionic loosening shovel and the light standard deep loosening were performed under different operating conditions through numerical simulation of the shovel working process and field performance comparison test. The results showed that the average drag reduction rate of the bionic shovel was 7.64%, and the error between the simulated value and the measured value was less than 9%. In order to optimize the structural parameters of the wing shovel, the wing inclination angle and the wing opening angle were used as the test factors, and the sensor tension value and the groove width were used as the test indexes, and the regression mathematical models were obtained. Particle swarm optimization (PSO) was used to solve the regression mathematical model, and the Pareto optimal solution set was obtained. Finally, the sensor tension value was 8.679 kN, the groove width was 144.2 mm, and the wing inclination angle was 20°, and the wing opening angle was 105.6°. Field verification test result showed that the relative error between the actual value and the predicted value was less than 6%. The multi-objective parameter optimization method based on RSM and PSO was scientific and feasible. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Particle swarm optimization (PSO)
Controlled terms: Bionics? - ?Pareto principle? - ?Shovels? - ?Soils
Uncontrolled terms: Different operating conditions? - ?Discrete element modeling? - ?Evaluation indicators? - ?Multi-objective parameter optimizations? - ?Multi-purpose machines? - ?Pareto optimal solutions? - ?Soil characteristics? - ?Structural parameter
Classification code: 461.1 Biomedical Engineering? - ?483.1 Soils and Soil Mechanics? - ?723 Computer Software, Data Handling and Applications
Numerical data indexing: Force 8.68e+03N, Percentage 6.00e+00%, Percentage 7.64e+00%, Percentage 9.00e+00%, Size 1.44e-01m
DOI: 10.6041/j.issn.1000-1298.2021.02.008
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
25. Design and Experiment on Pneumatic Flexible Gripper for Picking Globose Fruit
Accession number: 20211110087238
Title of translation:
Authors: Liu, Xiaomin (1); Tian, Debao (1); Song, Maozheng (1); Geng, Dexu (1); Zhao, Yunwei (1)
Author affiliation: (1) School of Mechanical Engineering, Beihua University, Jilin; 132021, China
Corresponding author: Geng, Dexu(gengdx64@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 30-43
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to complete the globose fruit picking well, a multi DOF flexible three-finger gripper of which wrist can rotate was designed by using flexible pneumatic multi-directional bending actuator. The flexible finger, which was compounded with the actuator to form a whole, bended to an arc to fit the surface of the globose fruit when supplied the air pressure. Three fingers cooperated with each other to grasp the globose fruit tightly and the wrist was twisted to separate it from the tree. The fabrication process of the “rigid-flexible coupling” actuator was investigated and acquired, and subsequently a physical prototype of flexible gripper was manufactured. The deformation model of the flexible pneumatic actuator was built and the deformation characteristics of the flexible actuator when supplied air pressure were obtained. Then the experiments were carried out to verify the theoretical model. Also, the physical prototype of the flexible gripper was trial-manufactured. The working space, grasp pattern and mechanical properties of grasping were studied and a variety of globose fruit picking experiments were carried out on the picking platform built in the laboratory. The results showed that the flexible gripper can well complete three kinds of grasping patterns, and it was flexible and reliable and had good compliance to suit the globose fruit. In addition, the flexible fingers were safe to the delicate surface of the fruit which reduced the damage of the fruit greatly. The size of globose fruit that the flexible gripper can complete was ranged from 30 mm to 130 mm, and the maximum mass was 1.28 kg when flexible gripper staggered grasp with three flexible fingers. The research laid a foundation for the further application of flexible gripper. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 31
Main heading: Pneumatic actuators
Controlled terms: Atmospheric pressure? - ?Deformation? - ?Fruits? - ?Grippers? - ?Pneumatics
Uncontrolled terms: Bending actuators? - ?Deformation Characteristics? - ?Deformation modeling? - ?Fabrication process? - ?Flexible grippers? - ?Flexible pneumatic actuator? - ?Rigid flexible coupling? - ?Theoretical modeling
Classification code: 443.1 Atmospheric Properties? - ?632.3 Pneumatics? - ?731.5 Robotics? - ?732.1 Control Equipment? - ?821.4 Agricultural Products
Numerical data indexing: Mass 1.28e+00kg, Size 3.00e-02m to 1.30e-01m
DOI: 10.6041/j.issn.1000-1298.2021.02.003
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
26. Knowledge Organization and Knowledge Base System of Combine Harvester
Accession number: 20211110087339
Title of translation:
Authors: Liu, Hongxin (1); Li, Jinlong (1); Guo, Lifeng (1); Zhang, Guangfu (1)
Author affiliation: (1) College of Engineering, Northeast Agricultural University, Harbin; 150030, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 381-393
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: According to the lack of systematic organization and classification of combine harvester knowledge, it was difficult to obtain and apply it efficiently in design. The concept of equipment pedigree and pedigree topology map was used to manage the knowledge and construct the knowledge base system of combine harvester under the traction of the actual application demand of intelligent design of combine harvester. Combined with the characteristics and forms of agricultural machinery design knowledge, the design process was analyzed and expressed by using the hybrid representation method of production rules and frame representation, and the design system was established. It used Visual Studio 2015 as the development tool, under the environment of. Net, using ADO. Net technology, CATIA secondary development technology and SQL Server database, the combine harvester design knowledge, parametric models and other resources were integrated and organized to build the combine harvester knowledge base system. By means of human-computer interaction, the design system was systematized, and the functions of knowledge query, reasoning and editing were realized by using fuzzy query, inference engine and ADO. Net. In addition, system transferred the pushed knowledge to the associated parametric models. The parameters of the related parametric models were adjusted, the models under different needs were quickly built, the design time was cut down and the design efficiency was improved. The knowledge base system could save the time of knowledge acquisition and analysis through case analysis, the system was used to query, reason, push and transfer the knowledge to the models for driving. This method can realize the efficient application of knowledge, enhance the inheritance and reuse of knowledge, improve the design efficiency, and provide a general method for the design of combine harvester parts. It was applicable to the requirements of the development of combine harvester series products, and establish the basis for the construction of a special intelligent design platform for combine harvester. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 30
Main heading: Knowledge management
Controlled terms: Agricultural robots? - ?Combines? - ?Efficiency? - ?Harvesters? - ?Human computer interaction? - ?Knowledge acquisition? - ?Knowledge based systems? - ?Machine design? - ?Product design? - ?Query processing
Uncontrolled terms: Combine harvesters? - ?Frame representations? - ?Hybrid representations? - ?Intelligent designs? - ?Knowledge base system? - ?Knowledge organization? - ?Parametric models? - ?Secondary development
Classification code: 601 Mechanical Design? - ?723 Computer Software, Data Handling and Applications? - ?821.1 Agricultural Machinery and Equipment? - ?913.1 Production Engineering
DOI: 10.6041/j.issn.1000-1298.2021.02.038
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
27. Poultry Egg Image Data Generating Based on Generative Adversarial Network
Accession number: 20211110088871
Title of translation:
Authors: Li, Qingxu (1); Wang, Qiaohua (1, 2); Ma, Meihu (3)
Author affiliation: (1) College of Engineering, Huazhong Agricultural University, Wuhan; 430070, China; (2) Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, Ministry of Agriculture and Rural Affairs, Wuhan; 430070, China; (3) National Egg Processing Technology Research and Development Sub Center, Wuhan; 430070, China
Corresponding author: Wang, Qiaohua(wqh@mail.hzau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 236-245
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: China is a big country in the production and consumption of poultry eggs, and testing the quality of poultry egg is very important. Machine vision plays an important role in non-destructive testing of poultry eggs. Computer vision is one of the commonly used technical methods in the field of non-destructive testing of poultry eggs. This technology needs to collect a large number of poultry egg image data for analysis and modeling in order to obtain a good recognition effect. When doing research on non-destructive testing of poultry eggs, researchers need to spend a lot of manpower and material resources on the collection of image data of poultry eggs. Aiming to solve this problem, an improved egg image data generation network based on unsupervised representation learning with deep convolutional generative adversarial networks (DCGAN) was proposed. The network was divided into a generator and a discriminator. The generator was used to generate the egg image data. The discriminator judged the authenticity of the generated egg image. The generator and discriminator competed with each other and finally generated high-quality egg image data. In order to improve the quality of the generated egg images, a residual network was used to construct a generator and discriminator, the loss functions of Wasserstein distance and gradient penalty were introduced to research the image generation in the case of egg transmission and egg reflection. This method effectively solved the problem that it was difficult to collect a large number of poultry egg image data, provided a data basis for the later identification and detection of poultry egg image, and also provided technical support for the subsequent establishment of poultry egg database. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Image enhancement
Controlled terms: Computer vision? - ?Convolutional neural networks? - ?Discriminators? - ?Nondestructive examination
Uncontrolled terms: Adversarial networks? - ?Analysis and modeling? - ?Image generations? - ?Material resources? - ?Non destructive testing? - ?Production and consumption? - ?Technical support? - ?Wasserstein distance
Classification code: 713.3 Modulators, Demodulators, Limiters, Discriminators, Mixers? - ?723.5 Computer Applications
DOI: 10.6041/j.issn.1000-1298.2021.02.022
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
28. Spatial-temporal Variation of Soil Moisture Monitored Using AHFO under Drip Irrigation in Gravel Area
Accession number: 20211110088942
Title of translation: AHFO
Authors: Hu, You (1); Ren, Ruiqi (2); Liu, Yanfang (2); Li, Min (1); He, Hailong (1); Si, Bingcheng (1, 2)
Author affiliation: (1) Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling; 712100, China; (2) School of Resource and Environmental Engineering, University of Ludong, Yantai; 264000, China
Corresponding author: Si, Bingcheng(bingchengsi@sina.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 257-265
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Precision irrigation can improve water use efficiency and reduce environmental pollution under extensive irrigation. However, it is necessary to accurately know the pattern of soil moisture in high spatial-temporal resolution in the field, which can be measured by the active heated fiber optics (AHFO) method. However, the measuring accuracy of soil moisture under drip irrigation conditions in high spatial-temporal resolution remained unclear. The AHFO method was applied to monitor spatial-temporal variation of soil moisture under subsurface drip irrigation, which was in Shandong Province gravel area. Then, the measurement accuracy was also compared with that by TDR method. The results showed that the measured soil water content by the AHFO was well consistent with that by TDR method(P3/m3 and 0.038 m3/m3, which was slightly lower than that of other studies due to the higher gravel content. Through the real-time monitoring, soil water content showed a better response to irrigation, indicating that AHFO method can capture the evolution of soil moisture during drip irrigation. Meanwhile, soil moisture distribution was significantly correlated with gravel content(P ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 33
Main heading: Soil surveys
Controlled terms: Gravel? - ?Moisture control? - ?Soil moisture? - ?Subirrigation? - ?Water content? - ?Water management? - ?Water pollution
Uncontrolled terms: Environmental pollutions? - ?Measurement accuracy? - ?Precision irrigation? - ?Real time monitoring? - ?Soil moisture distribution? - ?Soil water content? - ?Subsurface drip irrigation? - ?Water use efficiency
Classification code: 453 Water Pollution? - ?483.1 Soils and Soil Mechanics? - ?731.3 Specific Variables Control? - ?821.3 Agricultural Methods
DOI: 10.6041/j.issn.1000-1298.2021.02.024
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
29. Non-destructive Monitoring of Plug Seedling Growth Process Based on Kinect Camera
Accession number: 20211110087187
Title of translation: Kinect
Authors: Wang, Jizhang (1); Gu, Rongrong (1); Sun, Li (1); Zhang, Yun (1)
Author affiliation: (1) Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang; 212013, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 227-235
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to realize the non-destructive and automatic measurement of factory plug seedlings, a non-destructive monitoring method based on Kinect camera was proposed. With the cucumber plug seedlings, the Kinect camera was set up directly above the plug seedlings to obtain the depth image and the color image, and pixels matching was carried between obtained two kind of images. The germination rate was monitored by preprocessing, threshold segmentation, morphological operations and connected component statistics on color image. The center pixel point and the corresponding depth of the leaf were calculated by using the seedling contour obtained by image segmentation, and depth map, so as to obtain the height from the camera to the center of leaf. Lastly, combined with the distance of the camera to the plug tray, the seedling height of plug tray was monitored. The valid depth image was obtained by an algorithm which combined straight-through filtering, conditional filtering, and boundary-preserving filtering to effectively remove background noise around the plug seedlings and depth data with large fluctuations. Then, the leaf area was calculated by blade reconstruction. Based on the results of the height and leaf area of the plug seedling, the estimation of the healthy index was put forward. The method was verified by monitoring the growth process of plug seedlings. Within five days after germination, the monitored germination rate error was no more than 1.567%. The goodness of fit R2 between the monitored plant height and the actual plant height was 0.875, and the RMSE was 1.395 mm. The average error of the calculated leaf area was 2.15%, and the R2 of healthy index was 0.958. The results showed that the non-destructively monitoring method for plug seedlings can provide an effective solution for the monitoring of the plug seedlings. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 32
Main heading: Image segmentation
Controlled terms: Cameras? - ?Color matching? - ?Cultivation? - ?Mathematical morphology? - ?Monitoring? - ?Pixels
Uncontrolled terms: Automatic measurements? - ?Connected component? - ?Effective solution? - ?Germination rates? - ?Monitoring methods? - ?Morphological operations? - ?Non-destructive monitoring? - ?Threshold segmentation
Classification code: 742.2 Photographic Equipment? - ?821.3 Agricultural Methods
Numerical data indexing: Percentage 1.57e+00%, Percentage 2.15e+00%, Size 1.39e-03m
DOI: 10.6041/j.issn.1000-1298.2021.02.021
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
30. Quantitative Determination of Fatty Acid Value of Flour Based on Fusion of Olfactory and Spectral Technique
Accession number: 20211110088910
Title of translation:
Authors: Jiang, Hui (1); Liu, Tong (1); Chen, Quansheng (2)
Author affiliation: (1) School of Electrical and Information Engineering, Jiangsu University, Zhenjiang; 212013, China; (2) School of Food and Biological Engineering, Jiangsu University, Zhenjiang; 212013, China
Corresponding author: Chen, Quansheng(qschen@ujs.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 340-345
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: A novel quantitative detection method for the fatty acid value of flour during storage was innovatively proposed based on the feature fusion of colorimetric sensor data and near-infrared spectra. A colorimetric sensor array was developed to collect colorimetric sensor data of flour samples in different storage periods. A portable near-infrared spectroscopy system was built to collect near-infrared spectra of flour samples in different storage periods. Principal component analysis was used to perform feature reduction on the preprocessed colorimetric sensor data and near-infrared spectra. In the back propagation neural network (BPNN) model calibration, the five-fold cross-validation method was used to optimize and determine the best principal components (PCs) of the single technique analysis model. The optimized PCs based on the single technique model were fused in the feature layer, and a BPNN analysis model based on the fusion feature was established to realize the rapid detection of the fatty acid value during the flour storage. Experimental results showed that the number of PCs in the best BPNN model based on the characteristics of the colorimetric sensor and the near-infrared spectra were three and four, respectively. The average values of correlation coefficient and root mean square error of prediction of the BPNN model based on the fusion features in the prediction set were 0.927 6 and 1.934 5 mg/(100 g), respectively. The overall results showed that compared with the single technique data analysis model, the detection accuracy and generalization performance of the colorimetric sensor data and the near-infrared spectral feature fusion model were improved. The results can provide a new technical method for high-precision in-situ monitoring of grain storage quality. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 26
Main heading: Sensor data fusion
Controlled terms: Backpropagation? - ?Color? - ?Colorimetric analysis? - ?Colorimetry? - ?Digital storage? - ?Fatty acids? - ?Feature extraction? - ?Infrared devices? - ?Mean square error? - ?Near infrared spectroscopy
Uncontrolled terms: Back-propagation neural networks? - ?Colorimetric sensor arrays? - ?Correlation coefficient? - ?Cross-validation methods? - ?Generalization performance? - ?Near infrared spectral? - ?Quantitative determinations? - ?Root-mean-square error of predictions
Classification code: 722.1 Data Storage, Equipment and Techniques? - ?723.2 Data Processing and Image Processing? - ?723.4 Artificial Intelligence? - ?741.1 Light/Optics? - ?801 Chemistry? - ?804.1 Organic Compounds? - ?922.2 Mathematical Statistics? - ?941.4 Optical Variables Measurements
Numerical data indexing: Mass 1.00e-01kg
DOI: 10.6041/j.issn.1000-1298.2021.02.033
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
31. Trajectory Tracking and Vibration Suppression of Rigid-Flexible Coupling Spatial Closed-chain Robot
Accession number: 20211110088906
Title of translation:
Authors: Zhang, Qingyun (1); Zhao, Xinhua (1, 2); Liu, Liang (2, 3); Dai, Tengda (2, 3)
Author affiliation: (1) School of Computer Science and Engineering, Tianjin University of Technology, Tianjin; 300384, China; (2) Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control, Tianjin University of Technology, Tianjin; 300384, China; (3) National Demonstration Center for Experimental Mechanical and Electrical Engineering Education, Tianjin University of Technology, Tianjin; 300384, China
Corresponding author: Liu, Liang(liuliang_tjut@tjut.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 401-407 and 415
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To study the trajectory tracking and vibration suppression of a multi-variable high-dimensional spatial rigid-flexible coupling closed-chain robot, a PD control method based on feedforward compensation was proposed. The flexible spatial links were discreted by finite element method, and then the displacement field vector of the flexible links was described based on the floating frame of reference formulation, and the dynamic model of the rigid-flexible coupling spatial parallel robot was established considering the small displacement of the rigid end effector according to the Lagrange equation. The feedforward control was used to compensate the control torque with the coupling effects obtained in advance, which improved the response speed and tracking performance of the rigid-flexible coupling control system. At the same time, the PD control law was used to ensure the trajectory accuracy of the spatial closed-chain robot, and the trajectory tracking accuracy under different end loads was analyzed, and finally it was compared with the position PID algorithm. The results showed that the trajectory accuracy of the rigid end effector under the control algorithm was effectively improved relative to the trajectory accuracy under the position PID algorithm. Among them, the error in the X direction was reduced by 89.7%, the error in the Y direction was reduced by 4.3%, and the error in the Z direction was reduced by 12.9%, the vibration generated by the flexible spatial links was suppressed, and the effectiveness of the controller design was verified. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: End effectors
Controlled terms: Control theory? - ?Controllers? - ?Equations of motion? - ?Errors? - ?Feedforward control? - ?Flexible couplings? - ?Trajectories
Uncontrolled terms: Closed-chain robots? - ?Controller designs? - ?Displacement field vectors? - ?Feed-forward compensation? - ?Rigid flexible coupling? - ?Tracking performance? - ?Trajectory tracking? - ?Vibration suppression
Classification code: 602.2 Mechanical Transmissions? - ?731 Automatic Control Principles and Applications? - ?732.1 Control Equipment? - ?921.2 Calculus
Numerical data indexing: Percentage 1.29e+01%, Percentage 4.30e+00%, Percentage 8.97e+01%
DOI: 10.6041/j.issn.1000-1298.2021.02.040
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
32. Analysis and Compensation of End Position Error of Rigid-Flexible Coupling Serial Manipulator
Accession number: 20211110088907
Title of translation:
Authors: Tan, Yuesheng (1); Zhan, Denghui (1); Zhang, Penghao (1)
Author affiliation: (1) School of Technology, Beijing Forestry University, Beijing; 100083, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 416-426
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Due to the combined effects of non-linear deformations such as link flexibility and joint flexibility, the end position of the robot arm deviates, resulting in errors. For this problem, the IRB1410 serial manipulator was used as the research object. Through the combination of theoretical analysis, simulation analysis and experimental verification, the position error of the end of the manipulator was analyzed and compensated. A theoretical error model of the rigid-flexible coupling of the robotic arm was established and the Newmark β method was used for numerical simulation analysis; ANSYS and ADAMS were used to carry out the simulation of the motion error of the rigid-flexible coupled robotic arm, and the change of the end position error was analyzed. In order to achieve rapid compensation, a pseudo target point method based on BP network was proposed to compensate the position error based on the simulation error data. The root mean square (RMS) value of the position error was reduced by 68.3% after compensation. In terms of time consumption, the method compensated for an average time of 0.393 s per point. The compensation results showed that this method had good compensation effect. The error measurement experiment was carried out by designing and building a measurement experiment platform independently, and the proposed algorithm was used to perform experimental error compensation. Comparing the distance error values before and after compensation of the algorithm, the RMS value of the error was reduced by 77.01% after compensation. The results showed that the pseudo target point method was effective and practical for the compensation of flexible errors. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Error compensation
Controlled terms: Flexible couplings? - ?Industrial manipulators? - ?Numerical methods? - ?Redundant manipulators? - ?Robotic arms? - ?Robotics
Uncontrolled terms: Experimental verification? - ?Measurement experiments? - ?Nonlinear deformations? - ?Numerical simulation analysis? - ?Rigid flexible coupling? - ?Rigid-flexible coupled? - ?Root mean square values? - ?Target point methods
Classification code: 602.2 Mechanical Transmissions? - ?731.5 Robotics? - ?731.6 Robot Applications? - ?921.6 Numerical Methods
Numerical data indexing: Percentage 6.83e+01%, Percentage 7.70e+01%, Time 3.93e-01s
DOI: 10.6041/j.issn.1000-1298.2021.02.042
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
33. Protection Zoning of Cultivated Land Based on Form-Structure-Function Multidimensional Evaluation System
Accession number: 20211110088878
Title of translation: --
Authors: Liu, Huifang (1); Bi, Rutian (1); Guo, Yonglong (1); Wang, Jin (1)
Author affiliation: (1) College of Resource and Environment, Shanxi Agricultural University, Taigu; 030801, China
Corresponding author: Bi, Rutian(brt@sxau.edu.cn)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 168-177 and 354
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The protection zoning of cultivated land resources is an important basis for scientific implementation of cultivated land protection and guiding the sustainable utilization of cultivated land. Taking Jinzhong City as the study area, the evaluation indexes for cultivated land partition were constructed from the three dimensions of cultivated land form, spatial structure and cultivated land function. On the basis of three dimensional feature coupling analysis, the cultivated land protection area of Jinzhong City was divided into four types. The results showed that the cultivated land form was under the influence of geomorphology. The aggregation patches were mainly distributed in the Fen River valley and the loess accumulation geomorphologic area, while the diffuse patches were distributed in the denudation tectonic and the denudation erosion geomorphologic areas. There was a weak positive spatial correlation among the quality of cultivated land in Jinzhong City, in which the HH and LL aggregation types were main types. The HL and LH types were scattered in various regions. The functional coordination area were mainly distributed in the western Jinzhong City, with great potential for comprehensive utilization of cultivated land, while the functional incoordination area involved four counties. The incoordination was featured by two conditions of either the ecological function was higher than the productive and economic functions or the economic function was higher than the ecological and productive functions. According to the three-dimensional coupling classification of form, structure and function, the cultivated land protection area of Jinzhong City was divided into permanent cultivated land construction area, potentiality of land consolidation area, agricultural structure adjustment area and ecological de-farming area. The permanent cultivated land construction area was the main agricultural production area of Jinzhong City. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Land use
Controlled terms: Agricultural robots? - ?Agriculture? - ?Ecology? - ?Erosion? - ?Function evaluation? - ?Geomorphology? - ?Landforms? - ?Zoning
Uncontrolled terms: Agricultural productions? - ?Comprehensive utilizations? - ?Ecological functions? - ?Functional coordination? - ?Multi-dimensional evaluations? - ?Spatial correlations? - ?Structure adjustments? - ?Sustainable utilization
Classification code: 403 Urban and Regional Planning and Development? - ?454.3 Ecology and Ecosystems? - ?481.1 Geology? - ?481.1.1 Geomorphology? - ?821 Agricultural Equipment and Methods; Vegetation and Pest Control? - ?921.6 Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2021.02.015
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
34. Mechanism Analysis and Optimization of Solar Focusing Absorber for Forage Drying
Accession number: 20211110088984
Title of translation:
Authors: Du, Jianqiang (1); De, Xuehong (1); Ma, Yanhua (1); Qian, Wang (1); Su, He (1); Fan, Bin (1)
Author affiliation: (1) College of Mechanical and Electrical Engineering, Inner Mongolia Agricultural University, Huhhot; 010018, China
Corresponding author: De, Xuehong(dexuehong@126.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 300-307
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: At present, the solar energy drying equipment takes the non focusing plate air collector as the key working part, with low drying efficiency and low productivity. Aiming at the problem of low thermal efficiency of solar air collector, the black chamber function of solar focusing absorber was studied, and the function was used to reduce the external secondary radiation and energy loss of focused light. Four kinds of solar focusing absorbers were designed, and the performance mechanism and comparative analysis were carried out. The results showed that the triangular focusing absorber had a good black cavity effect. On this basis, the triangular focusing absorption device was further optimized, and the best performance can be achieved when the inner cavity depth of the absorber was about 4 cm. Four kinds of absorbers were tested and verified. It was concluded that triangle was better than circle, circle was better than quadrilateral, and semicircle was the worst. When the width of absorber opening was 5 cm, the effect of black cavity was less than 3 cm. The influence of the shape of cover plate on the performance of absorber was better than that of the circular plate, and the V-shape was the lowest. Through the research and optimization of the performance mechanism of the solar focusing absorber, the heat collection efficiency of the solar air collector was improved, and the productivity of the solar energy forage drying equipment and the quality of high-quality forage products were further improved. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 30
Main heading: Solar absorbers
Controlled terms: Collector efficiency? - ?Drying? - ?Energy dissipation? - ?Focusing? - ?Productivity? - ?Solar energy
Uncontrolled terms: Circular plates? - ?Comparative analysis? - ?Drying efficiency? - ?Drying equipment? - ?Mechanism analysis? - ?Secondary radiations? - ?Solar air collector? - ?Thermal efficiency
Classification code: 525.4 Energy Losses (industrial and residential)? - ?657.1 Solar Energy and Phenomena? - ?702.3 Solar Cells
Numerical data indexing: Size 3.00e-02m, Size 4.00e-02m, Size 5.00e-02m
DOI: 10.6041/j.issn.1000-1298.2021.02.029
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
35. Dynamic Modeling and Precision Analysis of Parallel Vibrating Screen with One-translation and Two-rotation
Accession number: 20211110088987
Title of translation:
Authors: Shen, Huiping (1); Xiao, Sijin (1); You, Jingjing (2); Yang, Tingli (1)
Author affiliation: (1) Research Center for Advanced Mechanism Theory, Changzhou University, Changzhou; 213164, China; (2) College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing; 210037, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 394-400
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Dynamic analysis for the one-DOF parallel mechanism(PM)vibrating screen with one-translation and two-rotation (1T2R) developed by the authors was performed. Firstly, since the PM contained two sub-kinematic chains (SKC) and its coupling degree was 0, it was easy to solve the symbolic solutions of the forward position and directly obtain the (angular) velocity and (angular) acceleration of all links. Then, the ordered single-open-chain(SOC) method based on the Newton-Euler principle proposed by the author’s team was used in the dynamic modeling of this spatial PM with two SKCs, and the driving torque M curve of the actuated joint of the PM was calculated. Comparing the curves obtained by Matlab programming and ADAMS simulation, the correctness of the ordered SOC method based on the principle of Newton-Euler was verified. In addition, the dynamic modeling error analysis was carried out with the driving torque M obtained by the traditional Lagrange method. The results showed that the absolute error range of the ordered SOC method based on the Newton-Euler principle was 33.39% smaller than the absolute error range based on the Lagrange modeling method. It was showed that the ordered SOC method based on the Newton-Euler principle had higher dynamic modeling accuracy. The research result provided a theoretical basis for efficient and precise dynamic modeling of multi-loop spatial PM as well as the motor optimization, parameters optimization and dynamic optimization of the parallel vibrating screen. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Rotation
Controlled terms: Error analysis? - ?Kinematics? - ?Lagrange multipliers? - ?MATLAB? - ?Mechanisms? - ?Vibrating screens
Uncontrolled terms: Dynamic model error? - ?Dynamic optimization? - ?Matlab programming? - ?Motor optimization? - ?Parallel mechanisms? - ?Parameters optimization? - ?Precision analysis? - ?Single open chains (SOC)
Classification code: 601.3 Mechanisms? - ?605.1 Small Tools, Powered? - ?921 Mathematics? - ?931.1 Mechanics
Numerical data indexing: Percentage 3.34e+01%
DOI: 10.6041/j.issn.1000-1298.2021.02.039
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
36. Smooth JPS Path Planning and Trajectory Optimization Method of Mobile Robot
Accession number: 20211110088948
Title of translation: JPS
Authors: Huang, Jianmeng (1); Wu, Yuxiong (1); Lin, Xiezhao (1)
Author affiliation: (1) College of Mechanical Engineering and Automation, Fuzhou University, Fuzhou; 350116, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 21-29 and 121
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Aiming at the problems of smoothness and efficiency in current path planning methods, based on jump point search (JPS), a path planning method considering both smoothness and search efficiency was proposed, and the trajectory was optimized by polynomial. Firstly, in order to improve the smoothness of the path, two optimization objectives were proposed to optimize the path sequence, that was, each corner of the path was on the vertex of the obstacle grid, and the obstacles that contacted with the path corner were located on the side with the angle less than 180 degrees. Then, the search rules of JPS were improved to get more valuable paths, and each path was smoothed, and then the path selection was made by weighing the length and angle with certain rules. Finally, polynomial was used to optimize the path, and the time allocation of the trajectory optimization method was studied to speed up the iterative efficiency. The feasibility and effectiveness of this method were proved by simulation and comparison with other algorithms. The results showed that the method had the advantages of high efficiency of JPS algorithm, and effectively solved the problems of redundant points and frequent turning points in path planning of JPS algorithm. In different density environments, compared with the smoothed JPS algorithm, the path planning method reduced the path length by 0.48%~1.80%, and the cumulative turning angle was decreased by 16.93%~52.75%. In the large environment, the proposed method had similar smoothness to Lazy-Theta*, but it had higher search efficiency. The cosine function was used to allocate time to accelerate the iterative efficiency of trajectory optimization, and good results were obtained through experiments. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Iterative methods
Controlled terms: Aerodynamics? - ?Cosine transforms? - ?Efficiency? - ?Robot programming? - ?Robots? - ?Trajectories
Uncontrolled terms: Cosine functions? - ?Different densities? - ?High-efficiency? - ?Path planning method? - ?Search efficiency? - ?Time allocation? - ?Trajectory optimization? - ?Turning points
Classification code: 651.1 Aerodynamics, General? - ?731.5 Robotics? - ?913.1 Production Engineering? - ?921.3 Mathematical Transformations? - ?921.6 Numerical Methods
DOI: 10.6041/j.issn.1000-1298.2021.02.002
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
37. Characterization of Dissociation-association Behavior and Self-assembly Nanoparticles of Soybean Lipophilic Protein by Heating Induction
Accession number: 20211110089024
Title of translation:
Authors: Sun, Bingyu (1); Liu, Linlin (1); Shi, Yanguo (1); Zhu, Xiuqing (1); Zhang, Na (1); Zeng, Jianhua (1)
Author affiliation: (1) College of Food Engineering, Harbin University of Commerce, Harbin; 150076, China
Corresponding author: Liu, Linlin(linlinliu0309@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 346-354
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Soybean lipophilic protein (SLP) is a highly hydrophobic protein rich in phospholipids, which is the key to solve the functional defects of soybean protein isolates, such as hydration properties and interfaces properties, etc. The dissociation-association behavior and self-assembly nanoparticles of SLP induced by heating were characterized by some modern technology means, which were the ultraviolet spectrum, fluorescence spectrum, circular dichroism spectrum, Fourier transform infrared, thermal analysis and gel electrophoresis techniques. The results showed that the heating treatment transition zone of SLP was 80~90, where the SLP can basically maintain a natural structure without significant changes when the heating treatment temperature was below 80. While the secondary conformation of SLP was changed significantly when the heating treatment temperature was above 90. The molecular structure of the SLP was dissolved and extended to maximum extent, with increased surface hydrophobicity at 90 for 20 min. Subsequently, the SLP self-assembled to form a stable single-distributed nanoparticle system with a particle size of about 110 nm. The dissociate subunits were reassembled into intermediate aggregates by interaction of disulfides and hydrophobic interaction, resulting in an increase of the degree of intermolecular aggregation and structural stability. The research result would provide theoretical support for the development of SLP-specific powder and its application in the food field. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 25
Main heading: Self assembly
Controlled terms: Dichroism? - ?Dissociation? - ?Electrophoresis? - ?Heating? - ?Hydrophobicity? - ?Nanoparticles? - ?Particle size? - ?Particle size analysis? - ?Phospholipids? - ?Proteins ? - ?Stability? - ?Structure (composition)? - ?Sulfur compounds? - ?Thermoanalysis? - ?Ultraviolet spectroscopy
Uncontrolled terms: Circular dichroism spectra? - ?Fourier transform infra reds? - ?Gel electrophoresis technique? - ?Hydrophobic interactions? - ?Intermolecular aggregation? - ?Self-assembly nanoparticles? - ?Soybean protein isolates? - ?Ultra-violet spectrums
Classification code: 741.1 Light/Optics? - ?761 Nanotechnology? - ?801 Chemistry? - ?802.2 Chemical Reactions? - ?804.1 Organic Compounds? - ?931.2 Physical Properties of Gases, Liquids and Solids? - ?933 Solid State Physics? - ?951 Materials Science
Numerical data indexing: Size 1.10e-07m, Time 1.20e+03s
DOI: 10.6041/j.issn.1000-1298.2021.02.034
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
38. Optimization Design and Experiment on Finned Double Plates Rice Moisture Content Measuring Device
Accession number: 20211110089013
Title of translation:
Authors: Wan, Lin (1, 2); Tang, Hongyu (1); Ma, Guangyu (2); Che, Gang (1, 2); Zou, Dandan (2); Sun, Wensheng (1)
Author affiliation: (1) College of Engineering, Heilongjiang Bayi Agricultural University, Daqing; 163319, China; (2) Heilongjiang Provincial Key Laboratory of Intelligent Agricultural Machinery Equipment, Daqing; 163319, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 320-328
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: In order to improve the accuracy of on-line detection technology of rice moisture content, the parallel plate capacitor was taken as the research object, and the fin type double plate detection method was adopted to optimize the detection value. Taking the plate thickness, plate spacing and relative area as experimental factors, the capacitance ratio sensitivity test was carried out by quadratic regression orthogonal combination test method. The optimal plate structure parameters were obtained as follows: plate thickness was 2.98 mm, plate spacing was 101.60 mm, and relative area was 32 583.69 mm2. The prediction and correction model of moisture content based on nonlinear autoregressive neural network NARX was established by Matlab software. The parameters of model structure and optimization algorithm were determined by comparative analysis. The error analysis showed that the NARX prediction model based on the quantitative conjugate gradient algorithm was the best. The hidden layer of the model was 1 layer, the number of neurons was 5, and the lag order was 3. Compared with the 105 constant weight method, the calibration error range was within ±0.5%, the maximum deviation was 0.65%, the minimum deviation was 0.26%, and the average deviation was 0.44%. Compared with the static capacitance water meter, the deviation fluctuation of on-line test of rice drying production was small, which met the requirements of rice drying production. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 27
Main heading: Plates (structural components)
Controlled terms: Capacitance? - ?MATLAB? - ?Moisture? - ?Moisture determination? - ?Predictive analytics? - ?Structural optimization? - ?Testing
Uncontrolled terms: Autoregressive neural networks? - ?Comparative analysis? - ?Conjugate gradient algorithms? - ?Experimental factors? - ?Optimization algorithms? - ?Optimization design? - ?Parallel plate capacitors? - ?Quadratic regression
Classification code: 408.2 Structural Members and Shapes? - ?701.1 Electricity: Basic Concepts and Phenomena? - ?921 Mathematics? - ?921.5 Optimization Techniques? - ?944.2 Moisture Measurements
Numerical data indexing: Area 5.84e-04m2, Percentage 2.60e-01%, Percentage 4.40e-01%, Percentage 6.50e-01%, Size 1.02e-01m, Size 2.98e-03m
DOI: 10.6041/j.issn.1000-1298.2021.02.031
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
39. Effects of Complexation with EGCG on Structural and Functional Properties of Soybean Protein Treated by Ultrasound-assisted Alkali
Accession number: 20211110088469
Title of translation: EGCG
Authors: Li, Yang (1, 2); Yan, Shizhang (1); Xu, Jingwen (1); Xie, Fengying (1); Wu, Lichun (1); Qi, Baokun (1, 2)
Author affiliation: (1) College of Food Science, Northeast Agricultural University, Harbin; 150030, China; (2) National Research Center of Soybean Engineering and Technology, Harbin; 150030, China
Corresponding author: Qi, Baokun(qibaokun22@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 364-370
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: Focusing on the effect of interaction with Epigallocatechin gallate (EGCG) on the structure and function of denatured soybean protein isolate (SPI). Fourier transforms infrared (FT-IR) spectroscopy and fluorescence spectroscopy were used to analyze the structure and conformation of the SPI-EGCG conjugates. The relationship between structural change and functional properties was analyzed through the determination of turbidity, emulsifying ability, emulsifying stability, particle size analysis, and Zeta potential analysis. The results showed that the absolute value of Zeta potential, turbidity as well as emulsifying activity and emulsion stability of denatured soybean protein were increased significantly, whereas its particle size was decreased. After complexation with EGCG, the functional properties of the protein were further improved. The secondary structure of SPI was changed and the protein was unfolded after EGCG were linked to it, which decreased the content of α-helix and increased the content of a random coil. Ultrasound combined alkali treatment also changed the structure of the protein. And the microenvironment around the aromatic amino acid residues in the protein was also changed, resulting in its conformational change. In addition, the fluorescence spectra showed that the fluorescence quenching of ultrasonic-assisted alkali treatment soybean protein by EGCG was a static quenching process with the formation of binding sites close to 1. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Proteins
Controlled terms: Binding sites? - ?Emulsification? - ?Fluorescence? - ?Fluorescence spectroscopy? - ?Fourier transforms? - ?Particle size? - ?Particle size analysis? - ?Quenching? - ?Turbidity? - ?Ultrasonics ? - ?Zeta potential
Uncontrolled terms: Conformational change? - ?Emulsifying activity? - ?Emulsifying stabilities? - ?Epigallocatechin gallate? - ?Fluorescence spectra? - ?Functional properties? - ?Soybean protein isolates (SPI)? - ?Zeta potential analysis
Classification code: 537.1 Heat Treatment Processes? - ?741.1 Light/Optics? - ?741.3 Optical Devices and Systems? - ?753.1 Ultrasonic Waves? - ?801.2 Biochemistry? - ?801.3 Colloid Chemistry? - ?802.3 Chemical Operations? - ?804.1 Organic Compounds? - ?921.3 Mathematical Transformations? - ?951 Materials Science
DOI: 10.6041/j.issn.1000-1298.2021.02.036
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
40. Topological Design of Large-displacement Compliant Mechanisms Considering Global Stress Constraints
Accession number: 20211110088997
Title of translation:
Authors: Zhan, Jinqing (1); Peng, Yiping (1); Luo, Zhen (2); Liu, Min (1)
Author affiliation: (1) School of Mechanotronics and Vehicle Engineering, East China Jiaotong University, Nanchang; 330013, China; (2) School of Mechanical and Mechatronic Engineering, University of Technology Sydney, Sydney; NSW; 2007, Australia
Corresponding author: Liu, Min(lmin2016@foxmail.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 408-415
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: To avoid static strength failure caused by large deflection, a design method for topology optimization of large-displacement compliant mechanisms considering global stress constraints was proposed. The Total-Lagrangian formulation and the incremental Newton-Raphson method were applied to solve the geometrically nonlinear response of the mechanisms. The element energy interpolation scheme for fictitious domain techniques was adopted to circumvent the non-convergence problem in the topology optimization of geometrical nonlinear problems. The maximum of the output displacement of the compliant mechanisms was developed as the optimization objective. The local stresses constraints for all elements were aggregated into a global stress constraint using the improved P-norm method. The optimization model for topology optimization of compliant mechanism with geometrical nonlinearities considering global stress constraints was established. The method of moving asymptotes was applied to solve the topology optimization problem for the design of large-displacement compliant mechanisms with global stress constraints. The results of numerical examples showed that large-displacement compliant mechanisms obtained by topology optimization with global stress constraint can effectively satisfy the stress constraints. As the allowable stress limit was decreased, the hinge area in the compliant mechanism configurations was gradually elongated, which can make the compliance of the mechanisms be more uniformly distributed. However, the output displacement of the mechanisms was gradually decreased. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 29
Main heading: Compliant mechanisms
Controlled terms: Design? - ?Mechanisms? - ?Newton-Raphson method? - ?Optimization? - ?Topology
Uncontrolled terms: Geometrical non-linearity? - ?Geometrical nonlinear problems? - ?Geometrically nonlinear? - ?Interpolation schemes? - ?Method of moving asymptotes? - ?Optimization modeling? - ?Static strength failures? - ?Total lagrangian formulation
Classification code: 601.3 Mechanisms? - ?921 Mathematics? - ?931.1 Mechanics
DOI: 10.6041/j.issn.1000-1298.2021.02.041
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
41. Research Status and Prospect of Plot-sowing Equipment and Technology
Accession number: 20211110088438
Title of translation:
Authors: Shang, Shuqi (1); Wu, Xiufeng (1); Yang, Ranbing (1); Li, Guoying (2); Yang, Xiaolong (1); Chen, Dongquan (1)
Author affiliation: (1) College of Mechanical and Electrical Engineering, Qingdao Agricultural University, Qingdao; 266109, China; (2) Qingdao Plantech Mechanical Technology Co., Ltd., Qingdao; 266109, China
Corresponding author: Yang, Ranbing(yangranbing@163.com)
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 1-20
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: The plot breeding seeder is a special seeder, which is used in field experiments such as cultivating new variety, breeding improved variety and variety comparisons. The current situation of the development of plot breeding industry and development level of plot breeding mechanization in China were briefly described. The sowing technology and mechanical development history of plot breeding was reviewed. Based on the characteristics of plot-sowing and combining the current different seeding agronomy requirements of different crop varieties, the core technology and working principle of plot-sowing under the existing drill and precision seeding modes were explained in detail. The main structure, composition form and operation mode of plot breeding drill and precision seeding technology was summarized, which included the current cutting-edge technology and key structures of practical applications in domestic and foreign, such as seed feeding, seed metering, ditching, soil covering, compacting, automatic control, plot localization mode, automatic monitoring and recording, etc. Through analysis of development of the current plot-sowing machinery in domestic and foreign, the main typical research achievements of plot-sowing technology and machinery in China were listed. The development prospect combined with China’s national conditions of plot-sowing mechanization was proposed in three aspects, which were the optimization and innovation of seeding technology, the improvement of mechanical processing quality as well as the high-tech integration. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 121
Main heading: Drilling machines (machine tools)
Controlled terms: Automation? - ?Drills? - ?Infill drilling? - ?Mechanization
Uncontrolled terms: Automatic monitoring? - ?Cutting edge technology? - ?Development prospects? - ?Mechanical development? - ?Mechanical processing? - ?National conditions? - ?Research achievements? - ?Seeding technology
Classification code: 511.1 Oil Field Production Operations? - ?601 Mechanical Design? - ?603.1 Machine Tools, General? - ?603.2 Machine Tool Accessories? - ?731 Automatic Control Principles and Applications
DOI: 10.6041/j.issn.1000-1298.2021.02.001
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
42. Prediction Model of Root Soil Moisture Content of Winter Wheat Based on IBAS-BP Algorithm
Accession number: 20211110087213
Title of translation: IBAS-BP
Authors: Xu, Jinghui (1); Liu, Zhengguang (1); Zhou, Yubo (1)
Author affiliation: (1) College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling; 712100, China
Source title: Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
Abbreviated source title: Nongye Jixie Xuebao
Volume: 52
Issue: 2
Issue date: February 25, 2021
Publication year: 2021
Pages: 294-299
Language: Chinese
ISSN: 10001298
CODEN: NUYCA3
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Machinery
Abstract: China’s agricultural water resources are scarce, irrigation water utilization is low, and waste is serious. In water-saving irrigation systems, the precise measurement and prediction of root soil moisture is of great significance. The BAS-Beetle antennae search algorithm performed well in numerical prediction in recent years, but it is greatly affected by the initial value. A beetle in each iteration of the traditional beetle antennae search (BAS) was improved into a beetle population. The IBAS-BP prediction model was established and optimized by the improved beetle antennae search algorithm, and the measured shallow root soil moisture content data was used to predict the soil moisture content of winter wheat root system at a depth of 50 cm. The results showed that compared with the PSO-BP prediction model, GA-BP prediction model and the original BAS-BP model, the IBAS-BP model not only effectively avoided the possibility of the network falling into a local minimum, but also had higher prediction accuracy and better robustness. Based on this, accurate predictions can be made on the soil moisture content of the winter wheat root system, which provided a basis for the rational use of agricultural water resources and the construction of water-saving agriculture. ? 2021, Chinese Society of Agricultural Machinery. All right reserved.
Number of references: 28
Main heading: Water resources
Controlled terms: Agricultural robots? - ?Crops? - ?Forecasting? - ?Irrigation? - ?Iterative methods? - ?Learning algorithms? - ?Moisture determination? - ?Predictive analytics? - ?Search engines? - ?Soil moisture ? - ?Soil surveys? - ?Water conservation
Uncontrolled terms: Accurate prediction? - ?Agricultural water? - ?Numerical predictions? - ?Precise measurements? - ?Prediction accuracy? - ?Search Algorithms? - ?Water-saving agricultures? - ?Water-saving irrigation
Classification code: 444 Water Resources? - ?483.1 Soils and Soil Mechanics? - ?723 Computer Software, Data Handling and Applications? - ?821.3 Agricultural Methods? - ?821.4 Agricultural Products? - ?921.6 Numerical Methods? - ?944.2 Moisture Measurements
Numerical data indexing: Size 5.00e-01m
DOI: 10.6041/j.issn.1000-1298.2021.02.028
Compendex references: YES
Database: Compendex
Compilation and indexing terms, Copyright 2021 Elsevier Inc.
Data Provider: Engineering Village
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