Unloading Method and Experimental Research of Positive Feed Deployable Antenna Mechanism

doi:10.3901/JME.2024.15.038

Abstract

Abstract: A new type of suspended microgravity unloading scheme is proposed for the combined unit mechanism of positive feed symmetric tetrahedral deployable antenna mechanism. The evaluation index and method of unloading point position optimization are established, and the optimized unloading point position is obtained. Based on the static stiffness matrix of the antenna mechanism, the cable stiffness is optimized, and the optimal stiffness ratio of the middle cable stiffness to the surrounding cable is obtained. The deployment process of the tetrahedral deployable antenna under two working conditions of gravity unloading and gravity non-unloading is simulated and analyzed. The stationary state and coordinate change curve of the dynamic process are compared and analyzed to verify the rationality of the unloading point obtained by optimization. A gravity unloading experimental platform with movable suspension points is designed and built. The deployment of the combined unit mechanism of the positive-fed symmetric tetrahedral deployable antenna mechanism under different unloading rope stiffness conditions and with or without unloading is compared to verify the correctness of the simulation analysis and the rationality of the unloading method.

Key words: truss antenna, deployable mechanism, unloading, stiffness optimization

CLC Number:

V443

LIU Enbo, ZHAO Yongsheng, LI Yongjie, GUO Xiaoyu, XU Yundou. Unloading Method and Experimental Research of Positive Feed Deployable Antenna Mechanism[J]. Journal of Mechanical Engineering, 2024, 60(15): 38-48.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.2024.15.038

http://www.cjmenet.com.cn/EN/Y2024/V60/I15/38

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