光学反射镜及其支撑结构设计与分析

Design and Analysis on Optical Reflector and Its Support Structure

空间遥感器光学反射镜支撑连接结构的高刚度和良好的热尺寸稳定性是保证其成像的关键因素,文中针对某空间光学遥感器反射镜及其支撑结构进行了静力学和热弹性分析,镜面变形云图显示反射镜面形精度在力学工况下满足成像要求,而热环境工况下显著超差,遥感器不能正常成像,因此对反射镜支撑结构进行改进,增加了柔性结构。通过有限元分析结果表明,在柔性结构的调节作用下,反射镜在力和热两种环境约束工况下,面形精度均满足成像质量要求,说明了结构的合理性。

High rigidity of structure and fine stability of thermal dimension are two key factors of imaging quality to the optical reflector of space remote sensor. The analysis of static and thermal elasticity was made to an space optical reflector and its support structure. From the figure of deformation, it was obvious that the support structure of reflector can make it meet the demands of imaging quality under the environment of static, but out of tolerance under thermal environment. In order to solve this problem, a kind of flexible structure is designed for regulating temperature. The finite element analysis result indicates that the surface accuracy of reflector meets the needs of the imaging quality under mechanics and thermal load, it shows that the flexible structure is reasonable.