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深空探测车辆在星球表面巡视过程中,应避免过度沉陷,保障其可靠的通过性能具有重要意义。月球和火星表面重力加速度分别约为地球表面重力加速度的1/6和2/5,地面实现低重力环境的模拟具有一定局限性,因此基于相似理论进行轮壤相互作用系统的量纲分析,研制二分之一缩比模型车;开展缩比模型车轮壤试验,重点研究滑转条件下车轮沉陷行为和牵引特性;基于地面力学理论,结合轮壤接触应力分布的线性化方法,建立与沉陷和滑转率相关联的星球车挂钩牵引力预测模型。通过土槽试验数据对模型进行验证,结果表明该模型具有较高的准确性。能够为星球车通过性评估提供一定的理论技术基础。
Deep space exploration vehicles in the planetary surface inspection process, should avoid excessive settlement, to ensure its reliable performance through the significance of. The gravitational acceleration on the lunar and the lunar surface is respectively about 1/6 and 2/5 of the gravitational acceleration on the earth’s surface. The simulation of the low gravity environment on the ground has some limitations. Therefore, based on the similarity theory, the dimensional analysis of the system of the soil- One-half reduction model car; carried out soil erosion test of reduction model wheel, focusing on wheel sinking behavior and traction characteristics under slip conditions; based on the theory of ground mechanics, combined with the linearization of contact stress distribution of the soil wheel, Planetary Vehicle Traction Hook Prediction Model Associated with Slip Rate. The model is validated by soil trough test data. The results show that the model has high accuracy. It can provide a certain theoretical and technical foundation for the planetary car to pass the sexual assessment.