光腔盒底座的模态分析与实验

Modal simulation and experimental analysis of base of optical cavity

针对实际安装和实验的光腔盒底座,以两种约束方式对真实边界条件进行模拟,通过仿真计算分析两种约束边界对结构动力特性的影响。开展模态实验分析,测得前六阶模态参数,与仿真结果对比,分析底座结构的振型特点以及底部固定情况与顶端波纹管的连接效果。结果表明,光腔盒底座的连接刚度较低,小波纹管对光腔盒的约束作用相对底面约束弱很多,不会改变模态规律。

The base of optical cavity is the major structure of a chemical laser.The dynamic characteristics analysis of the base is very important.Aimed at the practical base,modal simulation is done by two boundary conditions,the influential factors of dynamic characteristics are analyzed from the results.The first six modal parameters are obtained from the modal experiment.By comparing with the simulation,the shape characteristics are analyzed,the boundary condition of the bottom and the connection of corrugated tubes are also evaluated.The results are of benefit to the design and improvement of the chemical laser system.The results show that the connect stiffness is very low,and the constraint of corrugated tube does not change modal rules.