北京锦坤科技有限公司www.jonkon.com.cn 谭进国1,2,何欣1,付亮亮1 (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; 2. 中国科学院研究生院,北京100039) 摘要: 所述空间遥感器反射镜的工作温度为18±15℃,要求反射镜在此复杂工况条件下满足设计要求。介绍了反射镜材料和支撑结构材料的选择;对反射镜的支撑方式、轻量化等方面进行了分析讨论;根据反射镜柔性支撑结构的设计原理,采用CAD/CAE 工程软件进行了分析及优化,通过有限元法优化设计了一种反射镜中心支撑的柔性结构,在此温度变化范围内,反射镜面形误差变化量PV值小于λ /10、RMS 值小于λ /40(λ=632.8 nm)。zui后,通过力学环境实验测试反射镜面形变化量和反射镜组件模拟件的动态特性,证明该结构满足设计要求。 关键词: 中心支撑; 小型反射镜; 柔性结构 中图分类号: TH122 文献标志码: A 文章编号: 1007-2276(2010)06-1070-05 Support technique in centre of minitype reflector TAN Jin-guo1,2, HE Xin1, FU Liang-liang1 (1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China ; 2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China) Abstract: The working temperature of space remote sensor reflector is 18 ±15 ℃ in this article, and the reflector in the complex working condition needs to meet the design requirements. The choices of the reflector materials and the supporting structure materials were introduced. The supporting way and the lightweight structure of the reflector and so on were discussed. According to the design principles of the flexible supporting structure of the reflector and using CAD/CAE engineering software for analysis and optimization, a kind of reflector flexible structure of centre support was designed by means of finite element method (FEM). Surface deformation less than λ /10 (PV) and λ /40 (RMS) (λ =632.8 nm)in this temperature range. Finally, the changes of reflector surface deformation and the dynamic characteristic of reflector component simulators were tested by the mechanical environment test. The conclusion is proved that the structure of the reflector meets the demand of the optical design. Key words: Centre Support; Minitype reflector; Flexible structure 0 引言 随着空间遥感事业的发展,空间遥感器的应用越来越广泛,同时也对遥感器的成像质量提出更高的要 求。由于反射镜的微小变形都会影响遥感器的成像质量,因此,反射镜的支撑技术成为研制空间光学遥感器的关键技术之一。由于反射镜是成像系统的关键部件,它的精度与稳定性直接影响成像质量,因此,反射镜的支撑技术成为工程应用的关键技术之一。此文研究的反射镜是某型号空间小型遥感器的主镜。其外形尺寸为184 mm×153 mm×30 mm, 镜面面形精度达到PV≤λ/10,RMS≤λ/40(λ=632.8 nm),环境温度为18 ±15℃。反射镜的支撑要保证反射镜在同一状态下的位置及面形精度的稳定性,同时,要有效减小与其连接的部件因外部环境变化产生的变形对镜面精度的影响。此外,还需要反射镜具有良好的动态性能,可承受发射阶段产生的冲击和振动。 北京锦坤科技有限公司www.jonkon.com.cn |