Parameter Calibration of Discrete Element Simulation of Farmland Silt in Xinjiang

doi:10.6048/j.issn.1001-4330.2022.08.023

Abstract

Abstract:

【Objective】 To calibrate the discrete element simulation model of silt in Xinjiang and quantitatively analyze the interaction between soil touching parts of agricultural machinery and soil. 【Methods】 EDEM discrete element simulation software was used, the contact parameters between soil and soil contact material（65 Mn） were calibrated by slope test, and the contact parameters between soil and soil were calibrated by stacking angle test. 【Results】 EDEM distance of slope was taken as the optimization objective, the regression analysis was carried out, and an optimal combination of discrete element model parameters between soil and 65 Mn was obtained： recovery coefficient 0.51, static friction coefficient 0.56, dynamic friction coefficient 0.08, JKR surface energy 4.12; Taking the stacking angle as the optimization objective, an optimal combination of discrete element model parameters between soils is obtained： recovery coefficient 0.57, static friction coefficient 0.65, dynamic friction coefficient 0.23 and JKR surface energy 4.49. The accuracy of the discrete element contact model was verified. The simulation test of slope test and stacking angle test was compared with the actual test. The errors of rolling distance and stacking angle were 6.05% and 1.28% respectively. 【Conclusion】 Under the conditions of the established simulation model, the relative errors between the plow body simulation test and the actual test were 5.69%, 5.95% and 6.49% at the working speeds of 8, 9 and 10 km/h.

Key words: silt soil; discrete element method; plowing up; moldboard plow; parameter calibration

摘要：

【目的】标定新疆地区粉土离散元仿真模型,量化分析农业机械触土部件与土壤的相互作用。【方法】采用EDEM离散元仿真软件,运用斜坡试验标定土壤与触土材料（65 Mn）之间的接触参数,堆积角试验标定土壤与土壤之间的接触参数,以斜坡滚动距离为优化目标进行回归分析。【结果】土壤与65 Mn之间离散元模型参数的一种优化组合为恢复系数0.51,静摩擦系数0.56,动摩擦系数0.08,JKR表面能4.12;以堆积角为优化目标,土壤之间离散元模型参数的一种优化组合为恢复系数0.57,静摩擦系数0.65,动摩擦系数0.23,JKR表面能4.49。滚动距离和堆积角的误差分别为6.05%、1.28%。【结论】在建立的仿真模型条件下,在8、9、10 km/h作业速度下,犁体仿真试验与实际试验的工作阻力相对误差为5.69%、5.95%、6.49%,建立的模型真实可靠。

关键词: 粉土土壤, 离散元法, 耕翻, 铧式犁, 参数标定

CLC Number:

S222.12

LI Qingchao, ZHENG Xuan, LIU Jinbao, YANG Huaijun, WANG Zilong, ZHANG Luyun. Parameter Calibration of Discrete Element Simulation of Farmland Silt in Xinjiang[J]. Xinjiang Agricultural Sciences, 2022, 59(8): 2014-2024.

李清超, 郑炫, 刘进宝, 杨怀君, 王子龙, 张鲁云. 新疆农田粉土离散元仿真参数标定[J]. 新疆农业科学, 2022, 59(8): 2014-2024.

Figures/Tables 17

References 22

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密度 Density （kg/m³）	含水率 Moisture content （%）	泊松比 Poisson's ratio	粒径分布占比 Size ratio （%）
1 480	14.5	0.37	<0.001mm	0.001~0.05mm	>0.05mm
1 480	14.5	0.37	1.82	85.55	12.63

密度 Density （kg/m³）	含水率 Moisture content （%）	泊松比 Poisson's ratio	粒径分布占比 Size ratio （%）
1 480	14.5	0.37	<0.001mm	0.001~0.05mm	>0.05mm
1 480	14.5	0.37	1.82	85.55	12.63

材料 Material	参数 Parameter	数值 The values	来源 Source
土壤 Soil	泊松比	0.37	测量
	密度	1 480 kg/m³	测量
	剪切模量	1 MPa	参考
65Mn	泊松比	0.29	参考
	密度	7 861 kg/m³	参考
	剪切模量	7.9×10 000 MPa	参考

材料 Material	参数 Parameter	数值 The values	来源 Source
土壤 Soil	泊松比	0.37	测量
	密度	1 480 kg/m³	测量
	剪切模量	1 MPa	参考
65Mn	泊松比	0.29	参考
	密度	7 861 kg/m³	参考
	剪切模量	7.9×10 000 MPa	参考

编码 Code	恢复系数A Recoverycoefficient A	静摩擦系数B Static friction coefficient B	动摩擦系数C Dynamic friction coefficient C	JKR表面能D JKR surface energy D（J/m²）
1.718	0.6	0.8	0.2	7
1	0.558	0.675	0.167	5.746
0	0.5	0.5	0.12	4
-1	0.442	0.325	0.073	2.254
-1.718	0.4	0.2	0.04	1