月壤的钻取采样离散元动态行为研究

发布时间：2018-01-04 23:00

本文关键词：月壤的钻取采样离散元动态行为研究　出处：《工程设计学报》2013年06期 　论文类型：期刊论文

【摘要】：月壤为离散介质,其力学行为不仅受外部因素影响,而且受月壤颗粒形状之间相互作用和约束因素影响,一般连续介质力学难以模拟其力学特性,而离散元法作为一种分析离散介质的数值方法,可用来模拟器具与月壤相互作用的力学行为.基于前苏联Luna-24月面钻取采样过程力学机理分析,首先对钻取运动过程进行分析,然后应用PFC3D离散元软件,构建离散元月壤模型,通过赋予颗粒接触刚度、摩擦系数、粘结系数等定义月壤本构模型,仿真钻取过程,对比钻取消耗能量和钻进阻力.计算结果表明螺距和转速对钻取消耗能量和钻进阻力影响较大,螺距越大,转速越高,钻取消耗能量和钻进阻力越大,且与螺距和转速呈线性关系.研究结果可为月表采样机构的设计与优化提供借鉴.
[Abstract]:Lunar soil is a discrete medium, and its mechanical behavior is affected not only by external factors, but also by interaction and constraint factors between the particle shapes of lunar soil. It is difficult to simulate its mechanical properties in general continuum mechanics. As a numerical method to analyze the discrete medium, the discrete element method can be used to analyze the mechanical behavior of the lunar soil interaction between the simulator and the lunar soil. Based on the mechanical mechanism analysis of the sampling process of Luna-24 lunar surface drilling in the former Soviet Union. Firstly, the drilling motion process was analyzed, then the discrete element lunar soil model was constructed by using PFC3D discrete element software. The lunar soil constitutive model was defined by endowing particle contact stiffness, friction coefficient, bond coefficient and so on. Simulation drilling process, compared with drilling energy consumption and drilling resistance. The calculation results show that the pitch and speed of drilling energy consumption and drilling resistance have a greater impact, the larger the pitch, the higher the speed. The higher the drilling energy consumption and drilling resistance, and the linear relationship with pitch and rotational speed, the results can be used for reference in the design and optimization of monthly surface sampling mechanism.
【作者单位】：湖南大学机械与运载工程学院;
【基金】：国家科技支撑项目(2012BAH09B02)
【分类号】：P184.5
【正文快照】： 从前苏联Luna-16/20/24无人登月和美国Aopllo-11/12/14/15/16/17有人登月,人类共进行过9次月表取样.虽然前苏联和美国的月面取样器具经过地面试验的层层考核和全面验证,但是登月后实际采样时还是碰到了许多意想不到的困难,曾出现过钻取时不能及时排屑或月壤过于密实等出现停钻

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