竖向荷载对月球车行驶性能影响的离散元分析

发布时间：2018-06-06 23:45

本文选题：月壤 + 接触模型　；参考：《地下空间与工程学报》2015年05期

【摘要】：技术的发展使得月球车原材料强度更高、质量更轻,而复杂的探测任务要求月球车携带的探测设备越来越多。为了平衡月球车承受的荷重,防止月球车车轮因承受荷载不当导致在月面打滑、下陷以致不能正常行驶,有必要研究月面环境下竖向荷载对月球车行驶性能的影响。针对真实月壤内摩擦角较大、有粘聚力的特点,采用笔者提出的一种考虑粒间抗转动作用与粒间范德华力两个因素的月壤散粒体力学接触模型,模拟月面环境下三种竖向荷载P作用下月球车刚性驱动轮与月壤的相互作用问题。其中,当竖向荷载为400/6 N时,车轮打滑,因此,文中主要对竖向荷载为1 000/6 N和1 350/6 N两种情况进行对比分析。研究结果表明:月面环境下,滑转率随竖向荷载的增加呈下降趋势,月球车因为轮上荷载过小,导致滑转下陷过大而失去行走能力的风险更高。沉陷量也随竖向荷载的增加而减小,月面环境下荷载过小会使月壤的可通过性变差。月面环境下牵引效率随竖向荷载增大而升高但都保持在较低水平。
[Abstract]:With the development of technology, the raw materials of lunar rover are more intense and lighter, and the complex detection task requires more and more detection equipment to be carried by the lunar rover. In order to balance the load of the lunar rover and prevent the wheel of the lunar rover from sliding and sinking on the lunar surface due to improper load, it is necessary to study the influence of vertical load on the driving performance of the lunar rover under the lunar surface environment. In view of the characteristics of large internal friction angle and cohesive force in real lunar soil, a physical contact model of lunar soil is proposed, which takes into account the two factors of interparticle anti-rotation and inter-particle van der Waals force. The interaction between rigid driving wheel of lunar rover and lunar soil under three vertical loads P is simulated. Among them, when the vertical load is 400 / 6N, the wheel slips, so the vertical load of 1 000 / 6 N and 1 350% 6 N are compared and analyzed in this paper. The results show that the slip rate decreases with the increase of vertical load on the lunar surface, and the risk of losing the walking ability of the lunar rover is higher because the load on the wheel is too small. The amount of subsidence also decreases with the increase of vertical load, and if the load is too small in the lunar surface environment, the transmissivity of the lunar soil will become worse. The traction efficiency increases with the increase of vertical load but remains at a lower level under lunar environment.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;
【基金】：国家杰出青年基金(51025932) 国家自然科学基金(51179128)
【分类号】：P184.5;V476.3

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