着陆器足垫冲击月壤动态行为离散元仿真分析  

Simulation Analysis of Dynamic Behavior of Lander Footpad Impact on Lunar Regolith

作　　者：林云成[1] 李立犇 赵振家 张荣荣 金聪 邹猛 LIN Yuncheng;LI Liben;ZHAO Zhenjia;ZHANG Rongrong;JIN Cong;ZOU Meng(Beijing Key laboratory of Intelligent Space Robotic Systems Technology and Applications,Beijing Institute of Spacecraft System Engineering,China Academy of Space Technology,Beijing 100094,China;Key Laboratory of Bionic Engineering,Ministry of Education,Jilin University,Changchun 130022,China)

机构地区：[1]北京空间飞行器总体设计部空间智能机器人系统技术与应用北京市重点实验室,北京100094 [2]吉林大学工程仿生教育部重点实验室,长春130022

出　　处：《深空探测学报》2020年第2期171-177,共7页Journal Of Deep Space Exploration

基　　金：国家自然科学基金资助项目(51775233);中国空间技术研究院预研项目(5010120160759)。

摘　　要：研究着陆器与月壤的相互作用对着陆稳定性、安全性和着陆机构设计具有重要的意义。建立了具有角度的着陆器足垫冲击月壤的动态作用力学模型,并通过离散单元法分析了足垫在0°、8°、15°和22°冲击角度和1 m/s、2 m/s和4 m/s冲击速度下月壤的动态变化情况,得出了在冲击速度4 m/s、冲击角度为0°时,冲击力最大为5 080.6 N;在竖向位移相同的情况下,冲击角度越大冲击力越小。另外,足垫冲击月壤角度越大对月壤的压实作用越小,其中22°时,前后孔隙率变化为26.5%。冲击角度一定时,速度越大对月壤的压实较滞后,而压实程度较大,冲击速度为4 m/s时,前后孔隙率变化为78.1%。研究结果对着陆机构设计和着陆控制具有参考意义。It is important to study the interaction between lander footpad and lunar regolith for landing stability, safety and landing mechanism design. In this paper, a dynamic mechanical model of lunar regolith impacted by footpads with angle is built, and the dynamic changes of lunar soil under 0°、8°、15°、22° impact angle and 1 m/s, 2 m/s and 4 m/s impact velocity are analyzed by Discrete Element Method(DEM). It is concluded that the maximum impact force is 5080.6 N when the impact velocity is 4 m/s and the impact angle is 0°, and the impact angle was larger;the impact force is smaller when the vertical displacement is the same. In addition, the bigger the angle of footpad impact on lunar soil, the smaller the compaction effect on lunar soil. The change of porosity before and after 22° is only 26.5 %. When the impact angle is fixed, the higher the velocity, the more compact the lunar soil is, and the greater degree of compaction. When the impact velocity is 4 m/s, the change of porosity before and after the impact is 78.1%. The research has certain reference significance for the design of landing mechanism and landing control.

关 键 词：着陆器 足垫 冲击 离散元 月壤 

分 类 号：V42[航空宇航科学与技术—飞行器设计]