空间反射镜组件的环境适应性设计  

Environmental Adaptability Design of Space Mirror Subassembly

作　　者：曲利新[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033

出　　处：《光电工程》2016年第5期41-46,共6页Opto-Electronic Engineering

基　　金：国家863高技术研究发展计划资助项目(2009AA7020107)

摘　　要：为了保证空间反射镜具备优良的力学和热性能,在反射镜结构设计阶段对其进行结构尺寸稳定性分析至关重要。设计了某1 200 mm×450 mm口径长条形空间反射镜的轻量化结构,采用SiC材料制作反射镜镜坯,反射镜背部开三角形轻量化孔,提出一种背部3点柔性支撑方案,并设计了反射镜的支撑结构。通过对反射镜及其支撑结构在重力载荷和温度载荷工况下的变形分析,拟合出反射镜面的面形PV值、RMS值以及镜面的倾斜量,并依此作为修改设计方案的依据。分析结果表明,在X向重力作用下反射镜面形PV为51.9 nm,RMS为9.2 nm,反射镜绕Z轴倾角为2.9″;4℃均匀温升载荷作用下,反射镜面形PV为69.8 nm,RMS为12.4 nm;反射镜组件的基频为173 Hz,能够满足空间应用要求。In order to make space mirror have superior mechanical and thermal properties, dimensional stability analysis was crucial in the stage of the structural design. Lightweight structure of large aperture space mirror with a 1 200 mm × 450 mm caliber was designed. The mirror blank was made of SiC material. Triangular lightweight holes were laid out on mirror back. The 3 points flexure support scheme was put forward and the mirror support structure was designed. Through analyzing the deformation of the mirror and its supporting structure under gravity load and temperature loads, matching the PV, RMS of the mirror surface shape, and the tilt angle which would be taken as the basis for revising design scheme. As shown as analysis results, under the load case of gravity in X direction, the PV 51.9 nm and RMS 9.2 nm, the tilt angle rotating around Z axis was 2.9 ＂. Under the action of 4℃ uniform temperature rise, the PV was 69.8 nm and RMS was 12.4 nm. The fundamental frequency of mirror subassembly was 173 Hz, which can meet the requirements of space applications.

关 键 词：空间相机 反射镜 轻量化 柔性支撑 环境适应性 

分 类 号：TH75[机械工程—仪器科学与技术] V445.8[机械工程—精密仪器及机械]