拼接镜片支撑结构设计及分析

Structural design and analysis of spliced mirror base

针对部分主动光学拼接镜片支撑结构存在调整精度不高、稳定性较差、镜片姿态定位不准确等问题,提出了一种基于三点支撑模型的拼接镜片支撑机构设计方法。采用三点多自由度运动耦合方式,设计了一种用于望远镜拼接镜片空间位姿微调的支撑结构,并且利用有限元软件进行了仿真实验分析;设定边界条件后,在环境温度不断变化的情况下,进一步从机构的热稳定性、热膨胀性、位移变化、自向心等角度,对该结构进行了仿真实验。研究结果表明:该机构设计合理,具有良好的稳定性,可以实现镜片姿态纳米级的微位移调整,且调整精度较高,能够为未来拼接镜片共焦、共相实验奠定一定的基础。

Aiming at the problems of low adjustment accuracy,poor stability and inaccurate positioning of the lens posture of some active optical splice lens support structures,a design method of splice lens support mechanism based on the three-point support model was proposed.A three-point multi-degree-of-freedom motion coupling method was used to design a support structure for fine-tuning the spatial and posture of the splicing lens of the telescope,and the finite element software was used for simulation experiment analysis.The boundary conditions were set with continuously changed environment temperature.From the perspective of thermal stability,thermal expansion,displacement change,and self-centering of the mechanism,the structure was simulated.The results indicate that the design mechanism is reasonable.It has good stability and can achieve nano-scale micro-displacement adjustment of the lens posture.The adjustment accuracy is high,which can lay a certain foundation for the confocal and co-phase experiments of the spliced lens in the future.