大口径反射镜轻量化及其支撑结构设计

为了满足大口径(800mm400mm)矩形轮廓反射镜的结构稳定性设计要求,采用背部3点支撑方式,基于Bipod原理,为某超宽覆盖空间的相机主镜设计了一种新型柔性支撑结构。分析了反射镜各结构参量对其质量和刚度的影响,选取其中影响较大的参量作为设计变量,对镜体轻量化结构进行了优化设计,并进行了有限元分析。结果表明,优化设计后的反射镜组件具有较好的力学适应性、温度适应性和动态刚度。振动试验结果与有限元分析结果相符,证明了其准确性。

Design of lightweight large aperture mirrors and supporting structures

In order to satisfy the structure stability of a large rectangle mirror(800mm400mm), a novel flexible supporting structure of space camera primary mirror with super wide coverage was designed by Bipod principle in which three supporting points were adopted in backside of the mirror. The influence of the structure parameters on the mass and stiffness of the mirror was analyzed. The parameters which had significant effect were chosen as the design variables and the optimization design of mirror lightweight structure was carried out. The finite element analysis was conducted. The results indicate that the mirror structure has better mechanical adaptability, thermal adaptability and dynamical stiffness. The results of finite element analysis are consistent with the results of vibration test.