Stability analysis of Mars soft landing under uncertain landing conditions and two landing strategies
Stability analysis of Mars soft landing under uncertain landing conditions and two landing strategies
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DOI：
10.1108/aeat-12-2021-0377
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发表时间：
2022-06
影响因子：
1.5
通讯作者：
Jianzhong Ding;Xueao Liu;Yang Dong;Chunjie Wang
中科院分区：
文献类型：
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作者：
Jianzhong Ding;Xueao Liu;Yang Dong;Chunjie Wang
目的研究火星着陆器在两种着陆方式下考虑着陆条件不确定时的着陆性能。设计/方法/途径腿式火星着陆器的动力学分析模型建立着陆仿真，其中的非线性大变形柔性缓冲杆等效建模与刚体机构的外力和运动限制。采用基于准蒙特卡罗的Sobol方法和计算机辅助着陆仿真，分析了着陆稳定性对各种着陆条件的敏感性。此外，根据灵敏度分析的结果，选择敏感参数来估计旋转和间隙稳定性指标的安全边界。结果-它可以从这项研究中得出结论，着陆器具有良好的抗倾覆能力。着陆前关闭策略有助于保持着陆姿态，着陆时关闭策略有助于防止喷嘴与火星表面碰撞。实际意义本研究为考虑不确定着陆条件的火星着陆器选择更好的着陆策略提供了理论参考。独创性/价值参数化动力学火星着陆器模型和简化方法，提出了模拟登陆火星。不确定的着陆条件被参数化，并考虑在动力学模型。采用灵敏度分析和安全边界法对两种着陆策略的着陆性能进行了比较。
Purpose The purpose of this paper is to study the landing performance of the Mars lander considering uncertain landing conditions under two landing modes. Design/methodology/approach A dynamics analysis model for the legged Mars lander is established for landing simulation, where the nonlinear large-deformation flexible buffer rods are equivalently modeled with a rigid-body mechanism with external forces and movement limit. Sensitivities of the landing stability to various landing conditions are analyzed using the Quasi–Monte-Carlo-based Sobol’ method and computer-aided landing simulations. Moreover, based on the results of sensitivity analysis, sensitive parameters are selected for estimating the safe boundaries for stability indices of rotation and clearance. Findings It can be concluded from this study that the lander has excellent ability against overturning. The shutdown-before-touchdown strategy helps to maintain than landing pose, and the shutdown-at-touchdown strategy helps to prevent the nozzle from colliding with the surface of Mars. Practical implications This study provides a theoretical reference to choose the better landing strategies for Mars landers considering uncertain landing conditions. Originality/value A parameterized dynamics Mars lander model and a simplification method are proposed to simulate the landing on Mars. Uncertain landing conditions are parameterized and considered in the dynamics model. Sensitivity analysis and safe boundary methods are used to compare the landing performances with two landing strategies.