为了保证微型空间相机的超轻反射镜的面形精度和稳定性, 提出一种串联双轴片式柔性支撑结构.以多工况下超轻反射镜面形为目标, 应用集成优化方法对该支撑结构进行优化设计, 并对优化后的结构进行重力和温度工况下的静力学分析, 各工况下反射镜面形均方根值均在3.5 nm以内, 远优于设计指标.对研制的反射镜组件粘接强度进行校核, 并对其动力学性能进行有限元分析和试验验证.结果表明, 柔性支撑结构与反射镜粘接面积为1 138 mm2,反射镜组件的X、Y、Z三向的一阶频率都在500 Hz以上.有限元分析结果与试验结果的相对误差均在6.5%以内, 验证了有限元分析模型的正确性, 表明该串联双轴片式柔性支撑结构设计合理, 集成优化方法可靠.

A series of double-axis flexible support structure is put forward to ensure the surface figure and stability of the miniature space camera ultra-light reflectors. Taking the ultra-light mirror surface under multiple operating conditions as the goal, the integrated optimization method is used to optimize the support structure, and the statics of the optimized structure under the self-weight and temperature conditions are analyzed. The root-mean-square of each condition is within 3.5 nm, which is far better than the design requirement. The adhesive strength of the developed mirror assembly was checked and the dynamic performance was analyzed by finite element method and test. The bonding area of flexible support structure and mirror is 1 138 mm2. The basic frequency of the X, Y and Z directions of the mirror assembly is above 500 Hz. The relative error of the test and analysis results is less than 6.5%, which verifies the correctness of the finite element analysis model. At the same time, it shows that the series of double-axis flexible support structure design is reasonable, and the integrated optimization method is reliable.