光子学报, 2015, 44 (8): 0812004, 网络出版: 2015-09-08   

碳化硅反射镜轻量化结构的改进与优化

Improvement and Optimization of Lightweight Structure for SiC Reflective Mirror
袁健 1,2,*任建岳 1
作者单位
1 中国科学院长春光学精密机械与物理研究所, 长春 130033
2 中国科学院大学, 北京 100049
摘要
为了提高碳化硅反射镜的成像质量,针对反射镜传统的轻量化结构提出了改进形式及相应的优化方法.提出轻量化反射镜的变筋厚设计方案,分别基于几何位置与传力路径对轻量化筋进行分组,成像质量与传统结构相比明显提高,指出具有不同拓扑关系的轻量化筋在增强镜体刚度的过程中所起到的作用不同.对反射镜背部的筋板结构进行修剪,改善了远离支撑孔处面形的局部塌陷.针对改进后的反射镜建立集成优化模型,使用多岛遗传算法确定了反射镜中各结构参量的最佳组合.仿真结果表明,基于传力路径的分组改进方案经优化后的性能相比传统结构经优化所得的结果,面形准确度提高了33.2%,重量下降了11.7%.
Abstract
In order to improve imaging quality of SiC reflective mirror,an improved scheme of traditional lightweight mirror and the corresponding optimization method were proposed.The scheme of variable rib thickness design for lightweight mirror was brought forward.Lightweight ribs were divided into different groups based on geometry position and force transferring route respectively,both schemes with grouping performed better than traditional structure in imaging quality,indicating that lightweight ribs with different topology relation played different roles in enhancing the stiffness of lightweight mirror.The ribs on the back of mirror were trimmed in order to improve local distortion in areas away from supporting holes.The integrated optimization model based on improved structure was built,using Multi-island Generic Algorithm to find the best combination of all the structure parameters.The simulation results show that after optimization,the grouping scheme based on force transferring route overmatches traditional design,with surface quality improved by 33.2%,and mass decreased by 11.7%.

袁健, 任建岳. 碳化硅反射镜轻量化结构的改进与优化[J]. 光子学报, 2015, 44(8): 0812004. YUAN Jian, REN Jian-yue. Improvement and Optimization of Lightweight Structure for SiC Reflective Mirror[J]. ACTA PHOTONICA SINICA, 2015, 44(8): 0812004.

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