| 黄土高原坡地土壤与旋耕部件互作离散元仿真参数标定 |
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| 引用本文： | 孙景彬,刘琪,杨福增,刘志杰,王峥.黄土高原坡地土壤与旋耕部件互作离散元仿真参数标定[J].农业机械学报,2022,53(1):63-73. |
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| 作者姓名： | 孙景彬 刘琪 杨福增 刘志杰 王峥 |
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| 作者单位： | 西北农林科技大学机械与电子工程学院,陕西杨凌712100;农业农村部北方农业装备科学观测实验站,陕西杨凌712100;西北农林科技大学林学院,陕西杨凌712100 |
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| 基金项目： | 国家重点研发计划项目（2016YFD0700503）和陕西省科技重大专项（2020zdzx03-04-01） |
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| 摘 要： | 针对黄土高原坡地土壤-旋耕部件互作机理研究以及坡地专用旋耕机具设计缺乏准确可靠离散元仿真参数的问题,以典型坡地粘壤土(含水率13.4％±1％)为研究对象,选取EDEM中Hertz-Mindlin with JKR Cohesion接触模型,对相关仿真参数进行标定.首先,对土壤颗粒间接触参数进行了标定,以土壤颗粒的仿真堆...
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| 关 键 词： | 黄土高原 坡地土壤 旋耕 离散元法 参数标定 |
| 收稿时间： | 2021/9/15 0:00:00 |
Calibration of Discrete Element Simulation Parameters of Sloping Soil on Loess Plateau and Its Interaction with Rotary Tillage Components |
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| SUN Jingbin,LIU Qi,YANG Fuzeng,LIU Zhijie,WANG Zheng.Calibration of Discrete Element Simulation Parameters of Sloping Soil on Loess Plateau and Its Interaction with Rotary Tillage Components[J].Transactions of the Chinese Society of Agricultural Machinery,2022,53(1):63-73. |
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| Authors: | SUN Jingbin LIU Qi YANG Fuzeng LIU Zhijie WANG Zheng |
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| Institution: | (College of Mechanical and Electronic Engineering,Northwest A&F University,Yangling,Shaanxi 712100,China;Scientific Observing and Experimental Station of Agricultural Equipment for the Northern China,Ministry of Agriculture and Rural Affairs,Yangling,Shaanxi 712100,China;College of Forestry,Northwest A&F University,Yangling,Shaanxi 712100,China) |
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| Abstract: | Aiming at the problem of lack of accurate and reliable discrete element simulation parameters for the research on the interaction mechanism of soil-rotary tillage components with sloping soil on the Loess Plateau and the optimized design of special rotary tillage equipment, taking the typical slope clay loam soil with common moisture content of 13.4%±1% on the Loess Plateau as the research object, the relevant parameters were calibrated based on Hertz-Mindlin with JKR Cohesion contact model in EDEM. Firstly, the contact parameters between soil particles were calibrated. The simulated accumulation angle of soil particles was used as the response value, the regression model of soil accumulation angle was obtained based on the Box-Behnken optimization method in the Design-Expert software. The regression model was optimized by using the measured accumulation angle as the target, and the optimization results of restitution coefficient, static friction coefficient, rolling friction coefficient and surface energy parameters between soil particles were 0.15, 0.33, 0.05 and 9.04J/m2, respectively. Under the optimal parameter combination, the simulation value of soil accumulation angle was 41.59°, and the relative error with the measured value was 3.8%. Then, the contact parameters between soil and rotary tillage knife material 65Mn steel were calibrated. The numerical range of the above three parameters between soil and 65Mn steel was obtained by static friction test, oblique plate test and impact test. Based on this, the static sliding friction angle of soil on 65Mn steel was obtained based on Box-Behnken optimization method. The regression model was optimized by using the measured static sliding friction angle as the target, and the optimization results of static friction coefficient, rolling friction coefficient and restitution coefficient between soil particles and 65Mn steel were 0.50, 0.06 and 0.18, respectively. Under the optimal parameter combination, the simulation value of static sliding friction angle was 24.0°, and the relative error with the measured value was 1.7%. Finally, through the comparative analysis of field test and simulation test of slope rotary tillage, it was concluded that the maximum relative errors of horizontal and lateral displacement of soil particles were 4.3% and 5.1% respectively, within the acceptable range. It showed that the calibration results and research methods of discrete element simulation parameters were accurate and reliable. |
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| Keywords: | Loess Plateau sloping soil rotary tillage discrete element method parameters calibration |
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