| Citation: | ZHAO Ruijie, WANG Chunjie, YAN Suet al. Multi-working-condition topology optimization of coarse pointing mechanism for periscopic laser communication[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(11): 2114-2120. doi: 10.13700/j.bh.1001-5965.2019.0566(in Chinese)
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Laser communication technology has wide application prospects. The coarse pointing mechanism for periscopic laser communication is taken as the research object. The equivalent finite element modeling method of the mechanism is proposed, and then the corresponding finite element model is established. The effects of acceleration load and temperature load on the performance of the mechanism in the launch stage and the on-orbit working stage are analyzed. The multi-working-condition topology optimization method is used to optimize the main structure of the mechanism for improving the working performance of the mechanism. The optimization objective is to maximize the weighted average of the first three order frequencies of the mechanism under launch and working conditions, minimize the mirror central deformation during launch, and minimize the mirror surface error of thermal deformation during on-orbit working. The constraints are the mass of the mechanism and the gap between the response of the left and right mirrors. The feasible direction method is used to complete the optimization iteration calculation. After optimization, the fundamental frequencies of the mechanism under two working conditions increase. The central deformation and surface error of mirrors are reduced. The overall performance of the mechanism is improved significantly.
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