红外与激光工程, 2019, 48 (12): 1214003, 网络出版: 2020-02-11  

深空探测相机超轻主支撑结构优化设计

Optimization design of the ultra-light main supporting structure of deep space detection camera
作者单位
1 中国科学院长春光学精密机械与物理研究所, 吉林 长春 130031
2 中国科学院大学, 北京 100049
摘要
根据深空探测相机轻质高刚度、高性能的要求, 设计了一种超轻主支撑结构。深空探测相比于地球探测环境更加严苛, 主支撑结构作为主承力结构, 其在发射、在轨环绕阶段都应具有高稳定性, 来保持各光学元件之间的相对位置不变。与传统方法相比, 文中采用拓扑优化得到清晰的主支撑结构的最佳传力路径, 然后通过尺寸优化来提高主支撑结构基频。最后进行轻量化设计, 其前后框架结构轻量化率达到90%以上。仿真分析和试验结果表明, 主支撑结构满足公差要求且基频(80.264 Hz)远远高于整星一阶频率, 应用光学测量的方法振前、振后前框架相对于后框架倾角为3″、0.3″, 满足光学系统的公差要求, 具有较好的稳定性。大量级力学试验后系统的波像差<λ/14, 满足光学系统成像质量要求。
Abstract
According to the requirements of light weight and high stiffness of deep space exploration camera, an ultra-light main support structure was designed. The deep space exploration was more severe than the earth exploration environment. As the main bearing structure, the main supporting structure should have high stability in launching and orbiting to keep the relative position between the optical components. In contrast to traditional methods, topology optimization was used to obtain optimal load path with clear topological results of the main support structure, and then the fundamental frequency of the main support structure was improved by size optimization. At last, the lightweight design was adopted, and the weight reduction rate of the front and rear frame structures was over 90%. The results of finite element analysis and test show that the integrated main supporting structure can meet the requirements of tolerance and the basic frequency(80.264 Hz) is much higher than the requirement of 1st frequency of satellite. The method of applying optical measurement has a tilt angle of 3″ and 0.3″ relative to the rear frame before and after the vibration, which satisfies the tolerance requirements of the optical system and has good stability. The wavefront aberration of the system after a large number of mechanical experiments is below λ/14, which satisfies the imaging quality requirements of optical systems.

刘奉昌, 李威, 董吉洪, 赵伟国, 赵海波, 李晓波. 深空探测相机超轻主支撑结构优化设计[J]. 红外与激光工程, 2019, 48(12): 1214003. Liu Fengchang, Li Wei, Dong Jihong, Zhao Weiguo, Zhao Haibo, Li Xiaobo. Optimization design of the ultra-light main supporting structure of deep space detection camera[J]. Infrared and Laser Engineering, 2019, 48(12): 1214003.

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