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DEM-FEM coupling analysis of manual placing flag on the lunar surface

DOI：10.7511/jslx20230531001

 作者 单位 E-mail 梁绍敏 太原理工大学 机械与运载工程学院, 太原 030024 shmliang@163.com 冯云田 斯旺西大学 辛克维奇计算工程中心, 斯旺西 SA1 8EP 王志华 太原理工大学 机械与运载工程学院, 太原 030024

在月球表面插入旗帜对人类探索宇宙具有重要意义。本文采用离散元-有限元耦合算法对手动插旗过程进行数值分析,首先,建立月壤的离散元模型、旗杆的有限元模型以及月壤与旗杆相互作用的离散元-有限元耦合模型;然后,对旗杆的结构进行优化设计以提高其稳固性;最后,提出三种不同的插旗方式并讨论不同插旗方式下旗杆的动力特性。研究结果表明,离散元-有限元耦合算法对月面插旗过程的模拟是有效的;底部尖锐度及稳定支架开叉角度的合理设计有利于增大旗杆的入壤深度和旗杆的稳固性;增大直接插入法中轴向力、提高敲击插入法中敲击力和敲击频率均可以增加旗杆的入壤深度;旋转插入法中旋转速度和旋转频率对插入过程影响较小。以上研究可为月面手动插旗提供有效的方案和理论参考。

Placing flags on the lunar surface is of great significance for human exploration of the universe.This article uses the discrete element and finite element methods to numerically analyze the manual placing process of a flag.Firstly,a discrete element model of lunar soil,a finite element model of the flagpole,and a discrete element and finite element coupling model of the interaction between the lunar soil and the flagpole are established;Then the structure of the flagpole is optimized to improve its stability.Finally,three different flag insertion methods are proposed and the dynamic characteristics of the flagpole under different insertion methods are studied.The research results indicate that the discrete element and finite element coupling algorithm is effective in simulating the process of placing a flag on the lunar surface;The sharpness of the tip at the flagpole bottom has a significant effect on the insertion process.Choosing an appropriate sharpness is beneficial for increasing the insertion depth of the flagpole,and a reasonable design of the stable support fork angle is beneficial for increasing the depth of the flagpole entering the lunar surface,which is conducive to the stability of the flagpole.Increasing the axial force is beneficial for directly inserting the flagpole into the soil depth in the method;Increasing the knocking force and frequency is beneficial for increasing the penetration depth of the flagpole in the knocking insertion method.The rotation speed and frequency have little effect on the insertion process in the rotation insertion method.The above research provides an effective solution and reference for manually placing a flag on the lunar surface.