Authors

Abstract

In this study, a tire-soil rolling contact model based on the finite element method was established to determine the traction characteristics of the tire on the loose soil. Considering the soil parameters and tire parameters (loads, slip, inflation pressure and tread pattern), the influence of traction characteristics of the tire was obtained, taking tire sinkage and gross traction as evaluation indexes. The correctness of the tire-soil rolling contact model was verified by carrying out the soil bin-single wheel experiments. The results of the simulation and test showed that with the increase of load and sinkage of the tire, the gross traction tended to increase, thus enhancing the tire traction characteristics. With the increase of slip, the tire sinkage and gross traction increased, and the best tire traction characteristics were exhibited at a slip of 20%. Within the rated inflation pressure, as the inflation pressure increased, the tire sinkage decreased, the tire gross traction decreased and the traction characteristics of the tire were weakened. Under simulated working conditions, the traction characteristics of the tire first increased and then decreased with the increase of the number of tire lug pairs, and 15 tire lug pairs performed best. This paper presents a further study on the interaction between tires and soil under different influencing factors, and its findings provide an effective reference for predicting the traction performance assessment of tractor tires on working roads.

Abstract in Chinese

为了分析农用轮胎在松散土壤上的牵引特性，本研究以某型拖拉机轮胎为研究对象，综合考虑土壤参数、轮胎载荷、滑移、充气压力、胎面花纹等因素，以轮胎下沉量、轮胎总牵引力为指标来评价轮胎在土壤上的牵引性能。采用有限元方法建立了轮胎-土滚动接触模型，进行了轮胎-土沟槽试验。仿真与试验结果表明: 随着载荷和轮胎下沉的增加，总牵引力呈增大趋势，从而增强了轮胎牵引特性。随着滑移量的增加，轮胎下沉量和总牵引力不断增大，在滑移量约为20%时表现出最佳的轮胎牵引力特性。在额定充气压力范围内，随着充气压力的增大，轮胎下沉减小，总牵引力减小，轮胎的牵引力特性减弱。在模拟工况下，随着轮胎花纹数的增加，轮胎的牵引特性先增大后减小，存在最优值。