潜望式激光通信粗指向装置的多工况拓扑优化

激光通信技术具有广阔的应用前景。以潜望式激光通信粗指向装置为研究对象，提出了装置的等效有限元建模方法，建立了相应的有限元模型。分别针对发射阶段和在轨工作阶段2种工况，分析了加速度载荷和温度载荷对装置性能的影响。为了提升装置的工作性能，基于多工况拓扑优化方法，对装置的主体结构进行了优化设计。优化目标为装置在2种工况下的前三阶频率加权平均值最大、镜面中心在发射阶段的变形最小和镜面在在轨工作阶段的热变形面型误差最小，约束条件为装置的质量和左、右反射镜的响应差距。利用可行方向法完成优化迭代计算，优化后，装置在2种工况下的基频得到了提高，同时镜面的中心变形及面型误差得到了降低，装置的整体性能得到了明显提升。 

Multi-working-condition topology optimization of coarse pointing mechanism for periscopic laser communication

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.