针对某离轴三反空间相机研制任务,基于铝基复合材料——硼铝合金(TiB2/Al),采用了适合中、小型空间相机的薄壁框架武主结构形式,进行了相机主支撑结构设计.通过对整机进行有限元建模,以及固有模态、静力学、动力学、光机热集成分析,优化了相机结构设计,使得相机整机基频＞ 85 Hz,在±10℃均匀温度变化和1g重力耦合作用下,光学元件的面形精度仍符合光学设计要求.最终工程分析结果表明:相机的薄壁框架式主结构设计是合理的,整机结构一阶频率高,抗重力变形能力、抗振性能及抗热变形能力均能满足相机总体设计指标要求,与卫星平台的双脚架柔节机械接口能够有效抑制卫星平台的结构变形对相机主结构的扭曲作用.%A primary structural design concept of space three-mirror off-axis camera was presented. The primary structure of camera was a cast TiB2/Al frame. The finite element model of camera was built and the modal analysis, static analysis, dynamic analysis and STOP (structural-thermal-optical performance) analysis was performed. Based on the analysis results the structural design concept of camera was improved, finally the camera had a 85 Hz first natural frequency and the surface figure of reflective mirrors suffered from ± 10 °C temperature change & 1 g gravity release still met the requirements of optical subsystem design. The conclusion is that the primary structural design concept of space camera is applicable. The first natural frequency of camera is high enough to resist the structures deformation induced by gravity release on orbit and the dynamic disturbances during launch. The thermal-elastic deformation of camera structures undergoing on-orbit temperature variations meets the system requirements. The bipod-type flexure mechanical interface between camera and satellite platform can relax the distortion of camera structures due to the deformation of satellite platform structures.
展开▼
