Authors

Abstract

To address the lack of simulation parameters when applying discrete element simulations to guide the optimal design of grapevine burying machines, this study focused on the soil conditions in Xinjiang. The soil was divided into three layers, and the static and dynamic angle of repose characteristics of each layer were investigated using the Hertz-Mindlin with Johnson-Kendall-Roberts (JKR) contact model. First, the Plackett-Burman test was used to eliminate parameters that had no significant effect on the static and dynamic angles of repose. Then, the steepest ascent test was applied to narrow the parameter ranges, followed by the Box-Behnken test to develop regression models between the repose angles and the significant parameters. The results showed that the soil-soil restitution coefficient, soil-soil rolling friction coefficient, soil-steel static friction coefficient, and JKR surface energy were the key parameters influencing the static and dynamic repose angles. Experimental validation demonstrated that the average relative errors between the simulated and measured angles of repose using the optimized parameters were 0.92% and 0.32%, respectively, confirming the validity of the selected parameters. This study provides an important reference for the design optimization of grapevine burying machines and for discrete element simulation of other cohesive particulate materials.

Abstract in Chinese

针对应用离散元仿真指导葡萄埋藤机优化设计时仿真参数缺乏的问题。以新疆土壤为研究对象，将土壤分为三层，以 “ Hertz-Mindlin with Johnson-Kendall-Roberts ”为接触模型，研究了不同土层的静/动态休止角特性。首先利用 Plackett-Burman 检验排除对静/动态休止角影响不显著的参数，利用最陡爬坡检验缩小参数区间范围，利用 Box-Behnken 检验得到静/动态休止角与显著性参数之间的回归模型。结果发现，土-土恢复系数、土-土滚动摩擦系数、土-钢静摩擦系数和 JKR 表面能是影响静/动态休止角的主要参数。通过实验验证，最优离散元模拟参数的静/动态休止角与实测值的平均相对误差分别为 0.92% 和 0.32%，验证了所选参数的有效性，该研究为葡萄埋藤机的优化设计以及其他粘性颗粒物料的离散元模拟提供了重要参考。