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模拟月壤可行驶性的离散元数值分析
引用本文:高峰,李雯,孙刚,孙鹏.模拟月壤可行驶性的离散元数值分析[J].北京航空航天大学学报,2009,35(4):501-504.
作者姓名:高峰  李雯  孙刚  孙鹏
作者单位:北京航空航天大学交通科学与工程学院,北京,100191;北京航空航天大学航空科学与工程学院,北京,100191
基金项目:高等学校博士学科点专项科研基金资助项目(20070006012)
摘    要:基于模拟月壤扫描电镜显微照片,建立土颗粒的几何模型,提出不规则形状颗粒群系统的生成策略,构建模拟月壤颗粒间接触的简化本构模型,并利用量纲分析法和双轴压缩试验离散元模拟,建立土宏观力学特性与细观模型参数的关系,结合模拟月壤的三轴压缩试验数据确定离散元模型参数.在月球重力环境下,对轮-土交互作用进行离散元模拟,推导土壤推力的细观表达式,定性分析不同滑转率时土颗粒的动态行为,定量分析模拟月壤的可行驶性.研究结果表明,土壤推力随滑转率的提高而增大;当车轮以高滑转率行驶时,土壤推力相对行驶时间存在瞬态和稳态2个阶段,并且瞬态值高于稳态值.

关 键 词:深空探测  月壤  可行驶性  离散元
收稿时间:2008-04-25

Numerical analysis on travelability of lunar soil simulant by means of distinct element method
Gao Feng,Li Wen,Sun Gang,Sun Peng.Numerical analysis on travelability of lunar soil simulant by means of distinct element method[J].Journal of Beijing University of Aeronautics and Astronautics,2009,35(4):501-504.
Authors:Gao Feng  Li Wen  Sun Gang  Sun Peng
Affiliation:1. School of Transportation Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
2. School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
Abstract:The geometric model of lunar simulant particles was built based on its scanning electron microscopic-photograph(SEM),and a producing strategy for irregular-shape particle assembly was presented.A simplified contact reaction model of lunar particles was created.The relationship between soil macro-mechanical property and its meso-parameters was obtained by means of dimensional analysis and biaxial test simulation by distinct element method(DEM).According to the relationship and triaxial test data of lunar sim...
Keywords:planetary exploration  lunar soil  travelability  distinct element method  
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