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Modal Analysis and Model Updating of Optical Element
SHAO Jun;YE Jing-feng;HU Zhi-yun;ZHANG Zhen-rong;HUANG Mei-sheng
   2012, 32 (1): 39-42.   DOI: 10.3969/j.issn.1006-1355-2012.01.009
Abstract （1524）            Save
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.
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Modal Test and Vibration Analysis of the Optical Element with Different Boundary Constraint Conditions
SHAO Jun;YE Jing-feng;HU Zhi-yun;ZHANG Zhen-rong
   2011, 31 (6): 165-168.   DOI: 10.3969/j.issn.1006-1355-2011.06.037
Abstract （1517）            Save
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.
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