光学精密工程2011，Vol.19Issue(7)：1560-1568,9.DOI:10.3788/OPE.20111907.1560
大孔径长条反射镜支撑结构的设计
Design of support for large aperture rectangular mirror
摘要
Abstract
To design a large aperture rectangular mirror with high stiffness, high strength and good thermal dimensional stability precisely, an analytical mathematical model of the mirror supporting system was established and its modal characteristics were investigated. Firstly, the support location of the mirror was determined according to the conclusion obtained by modal analytical solution that the dynamic and static stiffness is the highest when the three supports keep the mass distribution relatively homogenous. Then, the support structure was analyzed in detail by Finite Element Method(FEM) and a new type of flexible support was presented. By adjusting two parameters, the thinnest thickness and the arc radius of a flexible hinge, the surface figure accuracy of the mirror was modified. Finally,the modal analysis of mirror component was performed. Analytical and experimental results indicate that the surface figure accuracy of the mirror can reach RMS 12.3 nm under the load case of gravity and 4℃ uniform temperature rise, respectively, when the thickness of the flexible hinge is 4 mm and its circular radius is 2, mm. Moreover,its first order natural frequency is 146 Hz, which shows an error under 5％ compared to FEA results. Research demonstrates that the mirror structure satisfies all design indexes.关键词
空间遥感器/离轴三反/主镜/柔性支撑/有限元分析Key words
space remote sensor/ off-axis three mirror anastigmat/ primary mirror/ flexible support/finite element analysis分类
航空航天引用本文复制引用
辛宏伟,关英俊,李景林,杨利伟,董得义,张学军..大孔径长条反射镜支撑结构的设计[J].光学精密工程,2011,19(7):1560-1568,9.基金项目
国家863高技术研究发展计划资助项目(No.2009AA7020107) （No.2009AA7020107）
