中文摘要：

采用离散元软件PFC2D,对月球车驱动轮在不同力学性质月壤上的牵引通过特性进行了数值模拟。研究采用线性接触刚度模型,通过双轴试验反复调整颗粒细观参数建立月壤离散元模型,其物理力学性质与真实月壤相似。在相同试验条件下,模拟试验与土槽试验结果趋势一致;模拟试验结果表明,挂钩牵引力随颗粒间摩擦因数增加而增加,当摩擦因数在1左右时增加趋于平缓;挂钩牵引力随孔隙率增加而线性减少;挂钩牵引力随粒径分布（rmax/rmin）增加先增加,当粒径分布大于5后减小,挂钩牵引力随重力加速度增加而增加,在1/6地球重力条件下,滑转率20%时,驱动轮的挂钩牵引力约为地球重力时的77.3%。

英文摘要：

Based on the results of the soil-bin test, the lunar soil traction characteristics were studied by DEM software PFC2D. The linear contact-stiffness model was used as DEM contact model for describing lunar soil and biax-test was used to adjust the micro parameters of particles. The results show that parameters of simulated lunar soil in this simulation are close to those of the lunar soil after adjusting the micro parameters. The paper researched the influence of the friction coefficient, porosity, r~x/rmin and gravity of the lunar soil to the traction ability of lunar rover. The results of the simulation test show that the draw bar pull （DP） increased with the increase of friction coefficient, the DP reduced with the increase of porosity, and the DP increased with the increase of rmax/rmin when the value of rmax/rmin is less than 5. The DP is increased with the increase of gravity and the DP is 77.3 % of the primary value when the driving wheel passes the lunar soil with 1/6 of the gravity.