A Footpad Structure with Reusable Energy Absorption Capability for Deep Space Exploration Lander: Design and Analysis

Chinese Journal of Mechanical Engineering

Original Article

Zhiwei Xiong¹  Xiaohang Qiu²  Yanzhao Guo³  Weiyuan Dou³  Lele Zhang³ 

[1]China Academy of Space Technology, 100094, Beijing, China

[2]School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, 100044, Beijing, China

[3]School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, 100044, Beijing, China

[4]National International Science and Technology Cooperation Base on Railway Vehicle Operation Engineering, Beijing Jiaotong University, 100044, Beijing, China

关键词: Deep space exploration lander;    Footpad;    Shape memory alloy (SMA);    Reusable energy absorption structure;    Design method;   

DOI  :  10.1186/s10033-023-00918-1

 received in 2023-02-20, accepted in 2023-07-20,  发布年份 2023

来源: Springer

【 摘 要 】

The footpad structure of a deep space exploration lander is a critical system that makes the initial contact with the ground, and thereby plays a crucial role in determining the stability and energy absorption characteristics during the impact process. The conventional footpad is typically designed with an aluminum honeycomb structure that dissipates energy through plastic deformation. Nevertheless, its effectiveness in providing cushioning and energy absorption becomes significantly compromised when the structure is crushed, rendering it unusable for reusable landers in the future. This study presents a methodology for designing and evaluating structural energy absorption systems incorporating recoverable strain constraints of shape memory alloys (SMA). The topological configuration of the energy absorbing structure is derived using an equivalent static load method (ESL), and three lightweight footpad designs featuring honeycomb-like Ni-Ti shape memory alloys structures and having variable stiffness skins are proposed. To verify the accuracy of the numerical modelling, a honeycomb-like structure subjected to compression load is modeled and then compared with experimental results. Moreover, the influence of the configurations and thickness distribution of the proposed structures on their energy absorption performance is comprehensively evaluated using finite element simulations. The results demonstrate that the proposed design approach effectively regulates the strain threshold to maintain the SMA within the constraint of maximum recoverable strain, resulting in a structural energy absorption capacity of 362 J/kg with a crushing force efficiency greater than 63%.

【 授权许可】

CC BY   
© Chinese Mechanical Engineering Society 2023

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