400mm跟踪望远镜结构设计和分析  

Design and analysis of the 400 mm tracing telescope structure

作　　者：孙敬伟[1] 吴小霞[1] 吕天宇[1] 李剑锋[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,吉林长春130033

出　　处：《红外与激光工程》2014年第8期2568-2575,共8页Infrared and Laser Engineering

基　　金：中国科学院三期创新工程专项基金(O65X32C060)

摘　　要：针对主镜口径为400mm口径的跟踪望远镜的设计要求,提出了一种有效的结构形式。首先确定了望远镜的光学结构形式和系统参数,并将整个系统分成了几个主要组成部分。接着着重确定了主镜室的结构形式,通过优化最佳支撑位置确定了主镜的支撑结构;同时确定了次镜室以及三翼梁的结构。然后运用有限元建模、分析的方法,重点分析了反射镜的面形精度受重力变形和温度变化的影响,进行了整个望远镜系统的刚度分析和温度变化对主次镜间隔的影响。保证了主镜在极限情况下面形RMS<30/λ,整个系统具有较好的刚度和环境适应性。分析结果表明,反射镜支撑结构以及整个系统的设计均达到了设计要求,可以为类似结构提供一定的指导。According to the design requirement of the 400 mm-aperture tracing telescope, one effective structure was introduced. Firstly, the telescopic structural style and system parameters were determined, and the whole system was divided into several main constituents. Secondly, the structure of the primary mirror cell was emphatically fixed, and the support structure of the primary mirror was determined according to the optimization of the best support positions, and the structures of the secondary mirror support and three-beam were designed. Thirdly, with method of finite element model and analysis, the primary mirror surface figures caused by the gravity and temperature change were intensively studied, and the stiffness of the whole telescopic system and the contribution of the primary mirror and secondary mirror separation caused by the change of temperature were analyzed. The mirror surface figure RMS was less than 0.033 wavelength in the ultimate state and the stiffness and temperature adaptability of the whole system were assured. The analysis results indicate that the design requirement of the mirror support structure and the whole system are achieved, and the direction for similar structure is provided here.

关 键 词：400mm跟踪望远镜 支撑结构 有限元分析 面形精度 

分 类 号：TH751[机械工程—仪器科学与技术]