Abstract: To analyze and evaluate anti-vibration performance of the optical element, a series of modal experiments about the L-shaped pad element with different boundary constraint conditions is carried on. Firstly, the deviation of the results from ANSYS simulation and measurement is limited in an allowable range, so that the definition of modal performance and the reliability of experiments of the model are validated. Secondly, anti-vibration performance of optical element is analyzed based on the experiments data, and the modal parameters of the element with different boundary conditions are obtained. Finally, the working stability of the element with different assembly situation is analyzed according to the different dynamic characteristics under different boundary constraint conditions. This work may provide a reference for improving the anti-vibration and working performances of optical elements in different environments.

Key words: vibration and wave, modal test, vibration analysis, optical element

摘要： 为了更好的实现对光学元件抗振性能的分析和评估。以直角垫板元件模型为例，开展一系列不同约束条件下的模态测试实验。首先结合ANSYS有限元模拟结果和模态测试结果，控制偏差在系统允许范围内，对模型模态属性的定义和模型建立的可靠性进行验证。其次，在基准有限元模型基础上，对不同约束条件下的该光学元件的模态参数进行计算，得到不同约束条件下不同的模态参数。最后，根据不同约束条件下元件所表现出来的不同的动力学特性，分析在不同装配状态下元件的工作稳定性，为进一步改善光学元件在不同振动噪声干扰下的工作性能和抗振性能奠定了基础。

关键词: 振动与波, 模态测试, 振动分析, 光学元件