基于SiC材料的大长宽比长条型反射镜轻量化结构设计

介绍了一种大长宽比长条型反射镜的轻量化结构设计方法.讨论了反射镜的材料选择和轻量化结构形式,同时在轻量化设计过程中引入拓扑优化方法,以反射镜柔性变形为设计约束,以最小体积为设计目标,经过迭代计算得到最优结果.根据优化结果,建立反射镜的三维实体模型,并利用MSC.Patran软件建立反射镜的有限元模型,对影响反射镜自重变...

Lightweight structure design of large strip mirror based on SiC material

According to the demands of high quality reflection mirrors for space telescopes,a design method of lightweight structure for large strip space using mirror is proposed,and the selection of materials,aspect ratio of diameter to thickness,light-weighting structure,as well as the position of support points are discussed.The topology method is introduced into the design,taking general flexibility as design constraint,minimum volume as design objective,after iterations,a better structure is gotten.According to the result of topology optimization,a parameter structure model is established using the finite element method.As the results of the analysis,some curves are presented.A lightweight structure for the large strip SiC mirror is given,the mass of the mirror is 12.5kg and the lightweight ratio reaches 70%.The surface figure accuracy is superior to λ/50 RMS(λ=632.8nm),which can fulfil the demand of the design.