四点球头反射镜支撑设计与分析  

Design and Analysis of Four-point Spherical Support for Mirror

作　　者：张楠[1,2] 庞寿成 常君磊 张凤芹[1] 李庆林[1] ZHANG Nan;PANG Shoucheng;CHANG Junlei;ZHANG Fengqin;LI Qinglin(Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China;Beijing Key Laboratory of Advanced Optical Remote Sensing Technology, Beijing 100094, China)

机构地区：[1]北京空间机电研究所,北京100094 [2]先进光学遥感技术北京市重点实验室,北京100094

出　　处：《航天返回与遥感》2018年第6期64-71,共8页Spacecraft Recovery & Remote Sensing

基　　金：国家重大科技专项工程

摘　　要：反射镜的支撑一直都是空间遥感相机的关键技术之一。为了能够获得较高的反射镜面形精度,文章针对离轴三反空间遥感相机,提出了一种四点球头反射镜的支撑方式。首先,在反射镜结构设计的基础上,介绍了四点球头反射镜支撑方式的原理以及支撑结构的组成;之后,对整个反射镜支撑结构中最重要的球头和支杆部分进行了详细设计;最后,使用Patran进行有限元模型前处理,使用Nastran求解,对反射镜组件的结构模态和各个工况下的反射镜面形精度进行仿真分析,得到的反射镜面形精度为1.6425nm,优于光学系统的指标要求。结果表明使用四点球头支撑方式的反射镜组件在保持较高刚度的基础上,能够获得较高的面形精度,证明了这种适用于长条型反射镜的支撑方式合理可行。The support of mirror is always one of the key technologies for space remote sensing camera.In order to obtain higher mirror surface accuracy,this paper proposes a four-point spherical support method for the TMA space camera.Firstly,based on the design of the mirror structure,the paper introduces the principle of the four-point spherical support and the composition of the support structure.After that,as the most important parts in the mirror support structure,the spherical support and strut are designed in detail.Finally,using MSC/Pantran/Nastran for finite element model pre-processing and solving,the structural modal of the mirror assembly and the mirror surface accuracy under various operational conditions are simulated and analyzed,and the mirror surface accuracy is1.6425nm rms,which is superior to the requirements of the optical system.The results show that the mirror assembly using the four-point spherical support can obtain higher surface accuracy on the basis of maintaining high stiffness,which proves that the support method suitable for the strip mirror is reasonable and feasible.

关 键 词：反射镜 四点球头支撑 面形精度 有限元分析 空间相机 

分 类 号：V447.1[航空宇航科学与技术—飞行器设计]