Calibration of Discrete Element Parameter of Rice Stubble Straw Based on EDEM

doi:10.13304/j.nykjdb.2022.1047

Abstract

Abstract:

In order to improve the accuracy of the parameters during the process of rice straw shredding and returning to the field in discrete element simulation， the stubble straw in the field after rice harvest were taken as the research object， and the contact parameters between straw and steel， straw and straw were measured through the slope test.Then based on simulation model and through the stacking angle and shear test， the bonding radius between straw model particles， tangential critical stress， normal critical stress， coefficient of restitution， static friction coefficient and dynamic friction coefficient were taken as the test factors， taking the shear resistance and radial stacking angle of straw as evaluation indicators， a multi-objective optimization simulation calibration experiment were conducted using the Box-Behnken experimental scheme.The results showed that the bonding radius between straw particles was 1.06 mm， and the normal critical stress of straw was 4.77×10¹⁰ Pa， tangential critical stress was 4.67×10⁶ Pa， the collision restitution coefficient between straw and straw was 0.21， the static Friction coefficient was 0.19， and the rolling friction coefficient was 0.09. The results of the simulation test results under the optimal parameter combination conditions and the physical test showed that the relative errors of the shear resistance and radial stacking angle of straw in the simulation test and physical test were 1.7% and 2.8%， respectively. This study could provide reference for the discrete element simulation analysis between straw and straw， as well as between straw and agricultural machinery.

Key words: rice, straw, discrete element method, test

摘要：

为了提高离散元法模拟水稻秸秆在切碎还田过程中的准确性，以水稻收获后田间的残茬秸秆为研究对象，通过斜面试验测定秸秆与钢、秸秆与秸秆之间的接触参数，基于离散元仿真模型，通过堆积角试验和剪切试验，以秸秆模型颗粒之间的粘结半径、切向临界应力、法向临界应力，秸秆之间的恢复系数、静摩擦系数、动摩擦系数为试验因素，以秸秆的抗剪力与径向堆积角为评价指标，利用Box-Behnken 试验进行多目标优化仿真标定。结果表明，秸秆颗粒之间的粘结半径为1.06 mm，秸秆法向临界应力为4.77×10¹⁰ Pa、切向临界应力为4.67×10⁶ Pa；秸秆与秸秆之间的碰撞恢复系数为0.21、静摩擦系数为0.19、动摩擦系数为0.09。最优参数组合条件下的仿真试验与物理试验对比验证表明，仿真试验与物理试验中秸秆的抗剪力、径向堆积角的相对误差分别为1.7%、2.8%。研究结果可为秸秆与秸秆之间、秸秆与农机具之间的离散元仿真分析提供参考。

关键词: 水稻, 秸秆, 离散元法, 试验

CLC Number:

S126

Zitao MA, Zhihao ZHAO, Wei QUAN, Fanggang SHI, Chen GAO, Mingliang WU. Calibration of Discrete Element Parameter of Rice Stubble Straw Based on EDEM[J]. Journal of Agricultural Science and Technology, 2023, 25(11): 103-113.

马紫涛, 赵智豪, 全伟, 石方刚, 高晨, 吴明亮. 基于EDEM的水稻残茬秸秆离散元仿真参数标定[J]. 中国农业科技导报, 2023, 25(11): 103-113.

Figures/Tables 14

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材料 Material	参数 Parameter	数值 Value
水稻秸秆 Rice straw	泊松比 Poisson ratio	0.4
	剪切模量Modulus of shear /MPa	1
	密度 Density/（kg·m^-3）	126.4
钢 Steel	泊松比 Poisson ratio	0.3
	剪切模量 Modulus of shear/MPa	79 000
	密度 Density/（kg·m^-3）	7 800

材料 Material	参数 Parameter	数值 Value
水稻秸秆 Rice straw	泊松比 Poisson ratio	0.4
	剪切模量Modulus of shear /MPa	1
	密度 Density/（kg·m^-3）	126.4
钢 Steel	泊松比 Poisson ratio	0.3
	剪切模量 Modulus of shear/MPa	79 000
	密度 Density/（kg·m^-3）	7 800

序号 No.	法向临界应力 Normal critical stress/（10¹⁰ Pa）	切向临界应力 Tangential critical stress/（10⁶ Pa）	粘结半径 Stalk bonding radius/mm	抗剪力 Shear resistance/N	相对误差 Relative error/%
1	7	7	0.50	14.3	39.9
2	6	6	0.75	20.4	14.2
3	5	5	1.00	26.2	10.1
4	4	4	1.25	21.3	10.5
5	3	3	1.50	13.7	42.4

序号 No.	法向临界应力 Normal critical stress/（10¹⁰ Pa）	切向临界应力 Tangential critical stress/（10⁶ Pa）	粘结半径 Stalk bonding radius/mm	抗剪力 Shear resistance/N	相对误差 Relative error/%
1	7	7	0.50	14.3	39.9
2	6	6	0.75	20.4	14.2
3	5	5	1.00	26.2	10.1
4	4	4	1.25	21.3	10.5
5	3	3	1.50	13.7	42.4

试验因素Test factor	低水平Low level （-1）	中水平Middle level （0）	高水平High level （1）
x₁：粘结半径 Stalk bonding radius/mm	0.75	1.00	1.25
x₂：法向临界应力Normal critical stress/（10¹⁰ Pa）	4	5	6
x₃：切向临界应力Tangential critical stress/（10⁶ Pa）	4	5	6
A：碰撞恢复系数 Collision restitution coefficient	0.21	0.31	0.41
B：静摩擦系数 Static friction coefficient	0.13	0.23	0.33
C：动摩擦系数 Rolling friction coefficient	0.05	0.15	0.25