A Shape-Memory Deployable Subsystem with a Large Folding Ratio in China’s Tianwen-1 Mars Exploration Mission  

作　　者：Chengjun Zeng Liwu Liu Yang Du Miao Yu Xiaozhou Xin Tianzhen Liu Peilei Xu Yu Yan Dou Zhang Wenxu Dai Xin Lan Fenghua Zhang Linlin Wang Xue Wan Wenfeng Bian Yanju Liu Jinsong Leng 

机构地区：[1]Department of Astronautical Science and Mechanics,Harbin Institute of Technology,Harbin 150001,China [2]Shanghai Institute of Satellite Engineering,Shanghai 201109,China [3]Center for Composite Materials and Structures,Harbin Institute of Technology,Harbin 150080,China [4]Department of Civil Engineering,Harbin Institute of Technology,Weihai 264209,China

出　　处：《Engineering》2023年第9期49-57,共9页工程（英文）

基　　金：supported by the National Natural Science Foundation of China(11632005);the Heilongjiang Touyan Innovation Team Program。

摘　　要：Once China’s Tianwen-1 Mars probe arrived in a Mars orbit after a seven-month flight in the deep cold space environment,it would be urgently necessary to monitor its state and the surrounding environment.To address this issue,we developed a flexible deployable subsystem based on shape memory polymer composites(SMPC-FDS)with a large folding ratio,which incorporates a camera and two temperature telemetry points for monitoring the local state of the Mars orbiter and the deep space environment.Here,we report on the development,testing,and successful application of the SMPC-FDS.Before reaching its Mars remote-sensing orbit,the SMPC-FDS is designed to be in a folded state with high stiffness;after reaching orbit,it is in a deployed state with a large envelope.The transition from the folded state to the deployed state is achieved by electrically heating the shape memory polymer composites(SMPCs);during this process,the camera on the SMPC-FDS can capture the local state of the orbiter from multiple angles.Moreover,temperature telemetry points on the SMPC-FDS provide feedback on the environment temperature and the temperature change of the SMPCs during the energization process.By simulating a Mars on-orbit space environment,the engineering reliability of the SMPC-FDS was comprehensively verified in terms of the material properties,structural dynamic performance,and thermal vacuum deployment feasibility.Since the launch of Tianwen-1 on 23 July 2020,scientific data on the temperature environment around Tianwen-1 has been successfully acquired from the telemetry points on the SMPCFDS,and the local state of the orbiter has been photographed in orbit,showing the national flag of China fixed on the orbiter.

关 键 词：Flexible deployable structure Shape memory polymer composite Mars exploration Temperature telemetry On-orbit deployment 

分 类 号：V476.4[航空宇航科学与技术—飞行器设计] P185.3[天文地球—天文学]