长条形SiC空间反射镜轻量化结构优化设计

Lightweight Structure Design for Rectangular SiC Space Mirror

在保证空间光学遥感相机反射镜结构刚度、面形精度的同时,最大限度的降低反射镜质量,成为各国新兴的、重要的研究课题。本文从材料、支撑形式、相关几何参数以及轻量化结构形式等方面对反射镜进行详细设计。提出了通过拓扑优化确定反射镜背部轻量化形式的方案。采用有限元分析法对获得的优化结果进行分析。分析结果表明:重力载荷下面形精度达到λ/10PV,λ/50RMS(λ=632.8nm),PV值7nm,RMS值1.68nm,反射镜组件一阶固有频率256Hz,均优于传统结构形式的反射镜,能够满足应用要求。

To meet the requirements of high location accuracy and surface figure accuracy for rectangular space mirror, and to reduce mirror weight extremely at the same time, became the new and important research subject in most countries. The material selection, support form, geometry parameters and lightweight structure form are taken into account in the design of a rectangular space mirror. Putting forward the topology optimization ensures the mirror back lightweight form. By using finite element analysis technique, the static stiffness of the mirror is analyzed. The analysis results show that： the surface accuracy reaches λ/10 PV,λ/50 RMS （λ=632.8 nm） under gravity load, PV value is 7nm, RMS values is 1.68 nm, and the mirror component first-order natural frequency is 256 Hz, which is better than traditional structure forms of mirrors, and can meet the application requirements.