光学元件的模态分析与模型修正

为了建立可靠的光学元件动力学计算模型，以光学镜座动力学计算模型为例，开展模态测试实验，进行相关模态分析，验证动力学计算模型的可靠性。为了减小理论模型与实际情况的偏差，对动力学计算模型进行修正，分析讨论了动力学计算模型材料密度、泊松比、弹性模量、几何尺寸等参数对频率的相对灵敏度，找出模型的最敏感参数，进行模型修正。修正后模型的动力学特性更加接近于实测值，模型频率与实测值的偏差明显减小，保证了动力学计算模型的准确性。

Modal Analysis and Modal Updating of the Optical Element

To establish a reliable dynamic computation model of the optical element, the modal experiment for a optical mirror mount and its analysis are researched, and the dynamic computation model is demonstrated. To reduce the deviation between the theory model and practicality, dynamic computation model is updated by discussing the frequency relative sensitivity to parameters of model, such as material property, Poisson ratio, elastic modulus, and geometrical dimension. Then the most sensitive parameter is found, and the model is updated according to the most sensitive parameter. Dynamic characteristics of the updated model is closer to the measurement data. So the frequency deviation between the simulation and measurement is observably reduced. Results show that the dynamic computation model is capable of describing the dynamic characteristics of the optical element.