光学元件的模态分析与模型修正

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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。 To study the dynamic performance of optical elements, the modal experiment for an optical mirror mount was carried out as an example. Its dynamic computation model was established and its reliability was verified. And the modal analysis was done. To reduce the deviation between the theoretical model and practical situation, the dynamic computation model was updated from time to time by analyzing the relative sensitivity of the frequency to the model parameters such as material property, Poisson ratio, elastic modulus, geometrical dimensions and so on. Then the most sensitive parameter was found, and the model was updated according to this parameter. It is found that the dynamic characteristics of the updated model is closer to the measurement data, and the frequency deviation between the simulation and measurement is obviously reduced. Results show that the dynamic computation model is capable for describing the dynamic characteristics of the optical elements.