着陆器足垫冲击模拟月壤的数值分析

发布时间：2019-03-02 12:22

【摘要】：针对竖向着陆冲击过程,开展大量的模拟月壤室内单元体试验,探讨模拟月壤材料参数的确定方法和取值范围.将着陆器按月地相似比尺简化为冲击筒体,建立着陆器足垫垂直冲击模拟月壤三维动力有限元模型,模拟分析在冲击荷载作用下的足垫轴力、速度和位移的实时动力响应,与室内模型试验结果进行对比,验证了该模型的合理性.计算表明:场地塑性区域呈形状变化的椭球,影响主要分布在2.0～3.0倍最大足垫直径深度范围内,撞击变形呈盆底形,速度响应滞后于轴力,位移响应滞后于速度.
[Abstract]:In view of the vertical landing impact process, a large number of laboratory unit tests of simulated lunar soil were carried out, and the determination method and range of simulated lunar soil material parameters were discussed. A 3D dynamic finite element model for simulating lunar soil vertical impact of lander footpad is established, and the real-time dynamic response of axial force, velocity and displacement of the footpad under impact load is simulated and analyzed, and the impact cylinder is simplified according to the similarity scale of the lander according to the monthly ground similarity scale, and the three-dimensional dynamic finite element model of the lunar soil is established. The rationality of the model is verified by comparing with the experimental results of indoor model. The results show that the shape-changing ellipsoid in the plastic region of the site is mainly distributed in the depth range of 2.0 脳 3.0 times the maximum diameter of the footpad. The impact deformation is basin-shaped, the velocity response lags behind the axial force, and the displacement response lags behind the velocity.
【作者单位】：浙江大学软弱土与环境土工教育部重点实验室;上海市政工程设计研究总院(集团)有限公司;中国空间技术研究院总体部;
【基金】：国家自然科学基金资助项目(51278451) 浙江省自然科学基金资助项目(LZ12E09001)
【分类号】：P184.5

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