大尺寸望远镜主镜组件有限元分析

为定量分析大尺寸望远镜自身重力对主镜镜面变形造成的影响,采用有限元的手段以非线性分析方法的ABAQUS软件为研究工具对某大尺寸望远镜主镜组件进行了精确有限元分析.在分析过程中将罚函数的摩擦形式引入至主镜组件的摩擦接触中,分别对组件的球头接触、芯轴接触进行了建模,完成了对于组件Y向与Z向的各部分应变分析.分析表明该主镜组件因自身重力作用造成的面形变化非常小,RMS方面的Y向与Z向面形变形分别为16nm和13nm,而主镜绕X轴倾斜量在Y向和Z向分别为0.5″和0.02″,完全满足使用条件.该分析为该望远镜的后续研制提供了参考.

The Finite Element Analysis of the Big Dimension Telescope Main Mirror Groupware

The big dimension telescope main mirror was exactly analyzed by ABAQUS finite element software using none linearity analysis method, which can quantitatively analyze the main mirror distortion caused by the big dimension telescope main mirror self weight. The scrub form of punish function was introduced to the scrub contact of the main mirror groupware in the analysis course. The ball head touch and core axes touch were molded and an emergency analysis of the mirror groupware Y and Z directions were completed. The surface appearance change was very little, which was caused by the self weight of the mirror groupware. The Y and Z directions of the RMS were 16 nm and 13 nm. And the Yand Z directions of the main mirror rolling the X direction were 0.5″ and 0.02″. The system can completely satisfies the using condition. The analysis can offer some reference to the adding research of the telescope.