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| Modal tests and analysis of SMPC deployable truss array antenna after repeated folding |
| WANG Xiaoqing1, YANG Tianyang1, ZHANG Yibei1, GAO Jifeng1, CHEN Wujun1,FANG Guangqiang2, XIE Chao2, CAO Zhengli2, MA Jia2 |
1.Space Structure Research Center, Shanghai Jiao Tong University, Shanghai 200240, China;
2.Institute of Aerospace System Engineering Shanghai, Shanghai 201108, China |
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Abstract Shape memory composite (SMPC) is an intelligent material with promising applications in the aerospace field. The modal tests were conducted on a five-bay SMPC deployable truss array antenna after repeated folding and unfolding shape memory process, and the natural frequencies and mode shapes are obtained through modal parameter identification to investigate the influence of prestressed cable and array panel on structural dynamics. The results show that the prestressed cable can improve the overall stiffness and shear resistance of the truss antenna along the longitudinal direction, and the array panel can improve the torsional stiffness of the truss. An acoustic-structure interaction (ASI) finite element model which include the effect of air on the array surface is established for the computational modal analysis, and the results are in good agreement with the modal test, indicating the accuracy of the simulation analysis method.
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Received: 07 April 2022
Published: 28 February 2023
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