星载激光雷达望远镜主镜超轻量化结构设计  

Ultra-lightweight Structure Design of Primary Mirror of Receiving Telescope of Space-borne Lidar

作　　者：李路 邢昆明[2] 赵明[2] LI Lu;XING Kunming;ZHAO Ming(West Anhui University,Lu′an 237012,China;Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]皖西学院机械与车辆工程学院,安徽六安237012 [2]中国科学院合肥物质科学研究院中国科学院大气光学重点实验室,安徽合肥230031

出　　处：《洛阳理工学院学报（自然科学版）》2021年第3期73-79,共7页Journal of Luoyang Institute of Science and Technology：Natural Science Edition

基　　金：民用航天“十三五”技术预先研究项目(D040103);皖西学院校级重点项目(WXZR201718).

摘　　要：针对某星载高重频激光雷达整机系统小视场、轻量化、杂散光抑制及探测性能的需求,设计Φ400 mm望远镜主镜,选用SiC材料和背部三点支撑方式,以筋板式轻量化结构主镜为初始模型,采用拓扑优化和结构参数集成优化相结合的方法对主镜进行超轻量化结构设计,获得的主镜质量仅为4.4 kg,轻量化率达到80%。通过有限元仿真分析了主镜的静、动力学性能。结果表明:在径向重力作用下,优化后的主镜面形RMS为0.51 nm;在光轴重力作用下,RMS为4.9 nm;RMS优于λ/50(λ@632.8 nm);一阶自然模态频率为1704.8 Hz,远大于1000 Hz的设计要求。主镜轻量化效果显著,主镜组件的静、动力学性能均满足设计要求,为同类型星载激光雷达望远镜主镜的超轻量化结构设计提供了思路和参考。In response to the requirements of a small field of view,lightweight,stray light suppression and detection performance of a space-borne lidar system with high-repetition frequency,a Φ400 mm telescope primary mirror was designed.The primary mirror is made of SiC and the three-point support method on the back.Taking the primary mirror of the rib-plate lightweight structure as the initial model,the ultra-lightweight structure of the primary mirror is designed by the combination of topology optimization and structural parameter integration optimization.A mass of the primary mirror obtained is only 4.4 kg,which is 80%lighter than the solid body.The static and dynamic performance of the primary mirror was tested by finite element simulation.RMS value of the optimized primary mirror is 0.51 nm under the action of radial gravity.RMS value of the optimized primary mirror is 4.9 nm under the action of axial gravity.The result show that RMS value is better thanλ/50(λ@632.8 nm).The first-order natural modal frequency is 1704.8 Hz,which is far greater than the design requirement of 1000 Hz.The main mirror has a significant lightweight effect,and the static and dynamic performance of the main mirror meets the design requirements,which provides ideas and references for the ultra-lightweight structural design of the primary mirror of the same type of space-borne lidar telescope.

关 键 词：超轻量化 拓扑优化 集成优化 RMS 有限元仿真 

分 类 号：TH703[机械工程—仪器科学与技术] TP73[机械工程—精密仪器及机械]