摘要
为了研究大口径望远镜的性能与稳定性,对1 m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8.9 nm与3.5 nm;经i Sight软件优化设计,主镜径向自重变形RMS值从3.5 nm减小到3.3 nm,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10.1 nm,满足望远镜的面形精度要求.
To study the performance consistence of the large-caliber telescope,the main 1 m-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 performed. After choosing the supporting scenarios of the main telescope and preparing case models,we proceeded 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 76 kg with a lightweight 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. 3 nm,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.
作者
卢晓明
贾建军
周成林
方勇勇
谢永
LU Xiaoming;JIA Jianjun;ZHOU Chenglin;FANG Yongyong;XIE Yong(The Shanghai Institute of Technical Physics of the Chinese Academy of Sciences,Shanghai 200083,China;School of Physical Science,University of Chinese Academy of Sciences,Bei j ing 100049,China)
出处
《郑州大学学报（工学版）》
CAS
北大核心
2018年第3期72-76,86,共6页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(61302181)
关键词
大口径
主镜
轻量化
柔性支撑
重力变形
优化设计
热变形
large-caliber telescope
main telescope
light-weight
whiffle tree support
gravity transforma-tion
optimal design
thermal transformation
