新型轻质大口径空间反射镜支撑设计

摘要：随着空间反射镜口径的增大，光学系统总质量随之剧增，这与当前光学遥感器轻小型化的发展趋势相矛盾。为了更好的满足空间光学遥感器发展的需要，文章从主反射镜组件的轻质化设计入手，从结构材料热匹配的设计、主镜轻量化形式的确定以及支撑结构的合理设计三个角度系统地进行了一体化结构—热设计。针对某型卡塞格林系统Φ630mm口径主镜进行了轻质化设计，三点为主多点为辅的支撑方案在保持组件结构刚度满足力学要求的同时,使反射镜具有良好的热尺寸稳定性。在综合考虑加工和工作状态后，最终确定了一种满足设计要求的整体优选方案，经最终分析计算确认，主镜组件镜面综合面形误差PV值均小于λ/10，各项指标完全满足光学系统对主反射镜的设计要求。

Design of New Type Spaceborne Lightweighted Primary Mirror Support

In order to satisfy the development requirement of spaceborne telescope primary mirror,a design of lightweighted primary mirror sub-assembly structure was presented.The influences of the material thermal math,lightweight pattern and the optimal support structures were considered during the mechanical/thermal design process.A high resolution Cassegrain optical payload with Φ650 mm primary mirror was designed,in which its specially support system could keep both high rigidity of structure and fine stability of thermal dimension.By considering the telescope manufacture and work station,the reasonable and optimal structure of the primary mirror sub-assembly was taken finally,analyzed results show its PV is less than λ/10,which can satisfy the requirement for the high resolution satellite primary mirror design.