半无限区域雪壤与车轮交互作用接触动力学特性分析

The interaction between wheels and snow soil is the basis of vehicle safety in plateau, polar and other environments. In order to construct a dynamic wheel-snow interaction model accurately characterizing the contact characteristics between wheels and snow soil, a simulation model of plate sinkage was established to obtain the pressure sinkage relationship of typical snow soil. Based on hard snow soil, a numerical simulation model of wheel-snow interaction was established to simulate the interfacial force of wheels and snow. The results of plate sinkage test and vehicle test were used to verify the validity of the numerical model. Based on the average contact stress, an analytical model of the interfacial force between wheels and snow was established, and the simulation results were used to verify the analytical model. The results show that: 1) the numerical simulation model of plate sinkage in the semi-infinite region can reflect the pressure sinkage characteristics of snow soil, and the simulation results of wheel snow interaction have a good agreement with the actual wheel sinkage and motion resistance coefficient. 2) The simulation results show that when the wheel slip rate is positive, the relationship between wheel load and wheel sinkage and the interfacial force of wheel snow tend to be stable. When the wheel slip rate is negative, the wheel sinkage becomes larger, which leads to the increase of the normal stress part of vertical support force and motion resistance. 3) When the wheel slip rate is positive, the analytical model of wheely-snow interaction can accurately predict the interfacial force of wheely-snow.