支撑驱动的非规则轻量化超大口径SiC空间反射镜快速参数化集成建模关键技术研究

Ultra large mirror is urgently needed for ultra-high resolution earth observation and future space observation. SiC has become an advanced research hotspot in space optics as high quality mirror substrate material. Synthetical optimization for Ultra large mirror needs modern design methodology for its complicated structure and multi-discipline constrains in the harsh environment, and fast parametric modeling is a key technology. Regular light-weighted ultra large Zerodur space mirror has been thoroughly studied abroad. While irregularly light-weighted structure is theoretically better than regularly light-weighted structure for limited aperture mirror. SiC is better than Zerodur for synthetical quality for space mirror substrate as well. Irregularly light-weighted ultra large space mirror using SiC as substrate material has been studied in this research. The systematic optimization for ultra large space mirror is under tackled using fast parametric modeling and integrated optimization environment. Objects are studied including analysis of design parameters and multi-discipline design indexes, methodology of fast parametric modeling and integrated optimization to acquire high light-weighted structure and high environment adoption for ultra large monolithic space mirror using SiC evanescent mode manufacturing technology. This research is meant to lay the technology foundation for ultra large aperture space observation and earth observation by exploring methodology for synthetical optimization and automatic design.

高分辨对地遥感和空间天文观测迫切需求超大口径空间反射镜，SiC作为高品质反射镜基底材料是空间光学研究热点。超大口径空间反射镜及支撑结构复杂、设计参数多，又需经受严苛力热环境和多学科指标约束，其优化设计需应用现代设计方法，而快速参数化集成建模是关键。国外实现了规则轻量化的超大口径微晶玻璃反射镜的快速参数化建模，而有限口径反射镜的非规则轻量化结构理论上更优，且SiC较微晶玻璃更优。本项目以非规则轻量化结构的超大口径SiC空间反射镜为研究对象，试图突破其快速参数化集成建模关键技术。具体内容有：基于国内整体式SiC低温消失模工艺实现的非规则轻量化结构，梳理和研究超大口径SiC空间反射镜组件的设计参数和多学科指标，研究其快速参数化集成建模方法，针对性地开发优化设计方法，实现更优轻量化率和环境适应性。本项目旨在研究超大口径空间反射镜的综合优化和自动化设计，为超大口径空间对地遥感和天文观测提供技术支撑。

高分辨对地遥感和空间天文观测迫切需求超大口径空间反射镜，SiC作为高品质反射镜基底材料是空间光学研究热点。超大口径空间反射镜及支撑结构复杂、设计参数多，又需经受严苛力热环境和多学科指标约束，其优化设计需应用现代设计方法，而快速参数化集成建模是关键。本项目以非规则轻量化结构的超大口径SiC空间反射镜为研究对象，针对非规则轻量化结构，梳理了超大口径SiC空间反射镜组件的设计参数和多学科指标，对超大口径反射镜的设计约束和工况进行了详细研究，制定了反射镜分析工况和指标要求；采用“主支撑+辅助支撑”的设计方案，采用“自动非规则加强筋优化设计+区域自动网格优化建模”的方法，突破了反射镜快速参数化集成建模关键技术，3s完成含120521单元的高质量（90%为四边形网格）的4米口径反射镜的有限元建模。以快速参数化集成建模为基础，开发优化设计方法，通过“基于随机泡的支撑点优选方案”进行设计空间的快速优选，然后基于“灵敏度分析+模型降维+全设计空间搜索”的组合优化方法，实现更优轻量化率（85%）和环境适应性，为超大口径空间对地遥感和天文观测提供技术支撑。本项目共发表相关论文4篇，发明专利2项，软件著作权1项，培养博士研究生1人，硕士研究生1人。