摘要
随着空间光学的发展,遥感器的口径越来越大,分辨率越来越高,这就导致遥感器的主反射镜口径和质量越来越大。主反射镜的设计是否合理,将直接影响遥感器的质量和成像质量。因此采用拓扑优化方法与有限元计算方法相结合,以NASTRAN为有限元解算器,以PATRAN为前处理器,在空间光学遥感器主反射镜外形、载荷、环境工况确定的情况下,对其结构进行拓扑优化,得到最优结构形式。通过对优化前后结构进行有限元分析,结果表明:优化后的反射镜镜面面形比传统的镜面面形减小或相当,质量减轻32%,动力学性能改善。优化后的主反射镜结构能够满足加工、工艺和装配的技术要求。这种优化与有限元分析技术的结合将为以后的光学反射镜的设计提供有效的帮助。
Large diameter and higher resolution of remote sensor are aquired with the development of space optics.This lads to the increase of diameter and weight for the primary mirror of remote sensor.The design of the primary mirror will have a direct effect on the weight of the remote sensors and imaging quality.Therefore,topology optimization method and finite element calculation method were combined,taking NASTRAN as finite element solver and PATRAN as pre-processor.The primary mirror structure of space optical remote sensor was topologically optimized under the condition of determined shape,load and environment.And the optimal structure was obtained.The structures before and after optimization were analyzed by the finite element.Results show that the optimized figure reducs 8 nm,quality reduces 32% compared with traditional shape.Property of dynamics is improved.Optimized primary mirror structure can meet the technical requirements of processing,technology and assembly.This combination of optimization and finite element analysis technology will provide effective help for the future design of optical mirror.
出处
《红外与激光工程》
EI
CSCD
北大核心
2010年第6期1066-1069,1074,共5页
Infrared and Laser Engineering
基金
国家863计划资助项目(863-2-5-1-13B)
