月球车车轮与月壤交互作用的离散元仿真

Discrete element simulation of interaction between rover wheel and lunar regolith

对土壤颗粒与车轮进行接触判断,用投影变换和累积求和的方法,建立起颗粒间的细观力学作用与宏观车轮牵引参数的联系。通过两个算例验证了应用离散元法所得的结论与传统地面力学理论相一致,证实了离散元法在轮土交互分析中的可行性。进一步计算发现,车轮在月面重力下运行,下陷增加,阻力增大,逐渐失去牵引能力,月球车越障和爬坡将会变得困难。

Contact estimation was performed on regolith particles and wheel,and the relationship between mesomechanics and macro traction parameters was obtained using the method of projection trans-form and accumulative summation. Two examples were valideted to result that the DEM calculated were consistent with traditional terramachanics. Therefore ,DEM is feasible in analysis of wheel-soil interaction.Further calculations indicated that the sinkage and resistance of wheel both increased under the lunar gravity,which made the wheel lost its traction. Under such condition,it would become more difficult for the lunar rover to surmount obstacle.