1m口径空间相机主望远镜组件设计-《郑州大学学报(工学版)》

文章信息/Info

Author(s):: Lu Xiaoming1; Jia Jianjun1; Zhou Chenglin2; Fang Yongyong2; Xie Yong2; 1. Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083; 2. University of Chinese Academy of Sciences, Beijing 100049; 3. Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083

Keywords:: large-caliber telescope; main telescope; light-weight; whiffle tree support; gravity transformation; optimal design; thermal transformation

摘要:: 为了研究大口径望远镜的性能与稳定性，对1m口径主望远镜组件进行了材料选取、结构设计与分析计算，给出了完整的设计分析结果。首先，比较常用材料的各项性能，确定1m口径望远镜的主镜材料，并进行轻量化设计。接着，经理论计算确定主镜的支撑方案，并对各个部件进行建模。然后，对主镜组件进行模态分析，验证支撑方案。最后，对主镜组件进行重力变形分析与热分析。轻量化后主镜重76kg，轻量化率达到77%。仿真结果表明：主镜轴向与径向自重变形RMS值分别为8.9nm与3.5nm；经iSight软件优化设计，主镜径向自重变形RMS值从3.5nm减小到3.3nm，相比优化前提高了5.7%。当主镜镜体温度梯度为20±0.3℃时，镜面RMS值为10.1nm，满足望远镜的面形精度要求。

Abstract:: To study on the performance consistence of the large-caliber telescope, the main 1m-caliber telescope was structure-designed and analyzed to achieve the comprehensive result. The materials of the main telescope were selected by comparing the materials’ nature, and light-weight design was proformed. After choosing the supporting scenarios of the main telescope and prepare case models. We proceed modal analysis to the main telescope parts, and verified supporting materials. Last, we conducted the gravity-transformative and thermal analysis on the main telescope. The weight of the main telescope was reduced to 76kg with a light-weight ratio of 77%. The simulation results indicated that: the RMS of axial and radial direction of the speculum were 8.9 nm and 3.5 nm respectively. After performing optimal design viai Sight, the radial self-weight deformation RMS of the primary mirror was improved to 3.3nm, decreased 5.7% comparingwith the RMS before optimization. When the temperature of main specular body reached 20± 0.3℃, the RMS was 10.1 nm, which satisfied the surface figure accuracy of the telescope.