Authors

Abstract

To carry out simulation research on tire-soil interaction, EDEM software was used to calibrate the test soil and the contact parameters between the tire and soil. The soil contact model was the Edinburgh Elasto-Plastic Adhesion (EEPA) model. Using the soil repose angle as the repose value, the contact plasticity ratio, the soil-soil rolling friction coefficient, and the tensile exponential (Tensile exp) were respectively calculated using the Plackett-Burman test, the steepest climbing test, and the Box-Behnken test, and the optimal combination of parameters was found to be E = 0.08, B = 0.1, and F = 4.8. The values of the remaining parameters were as follows: a soil-soil static friction coefficient of 0.45, a restitution coefficient of 0.5, a surface energy of 4, and a tangential stiffness multiplier of 0.35. Based on the slope sliding method, the coefficient of static friction between soil and rubber was calculated as 0.88. On this basis, a central combination test was designed to calibrate the rubber-soil rolling friction coefficient and coefficient of restitution, the optimal combination of which was found to be H = 0.18 and I = 0.55. A soil tank model was created using the optimal parameters, and the correctness of the established soil discrete element model and rubber-soil contact parameters was validated by comparing the simulation results and the results of an experiment of the tire driving process.

Abstract in Chinese

为对轮胎-土壤相互作用开展仿真研究，利用软件EDEM对试验土壤以及轮胎-土壤之间的接触参数进行标定。采用Edinburgh Elasto-Plastic Adhesion(EEPA)模型作为土壤的接触模型。以土壤堆积角为响应值，通过Plackett-Burman试验、最陡爬坡试验、Box-Behnken 试验得出对堆积角影响最显著的接触塑性比、土壤-土壤滚动摩擦系数以及粘附分支曲线幂指数的最优组合为0.08、0.1、4.8。其余参数取值为：土壤-土壤静摩擦系数0.45，恢复系数0.5，接触表面能4，切向刚度因子0.35。基于斜面滑动法原理测定土壤与橡胶之间的静摩擦系数为0.88。在此基础上设计了中心组合试验对橡胶-土壤滚动摩擦系数和恢复系数进行标定，确定参数最优组合为0.18、0.55。利用上述参数建立土槽模型，通过轮胎行驶过程的仿真与试验对比，验证了建立的土壤离散元模型和橡胶-土壤接触参数的正确性。