Random vibration analysis and verification for large aperture mirror component

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (11) : 74-78.

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Random vibration analysis and verification for large aperture mirror component

Dong De-yi1,2 ; Xin Hong-wei1 ; Yang Li-Wei1 ; Li Zhi-lai1 ; Guan Ying-Jun3

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Abstract

As its stress is usually very high during random vibration, which leads to remained strain causing decrease of imaging quality, random vibration response of large aperture mirror component was analyzed. The theory of random vibration analysis and its finite element implementation were discussed. According to its design feature and stress transfer path, the mirror component’s finite element model was built and its random response was analyzed. The root mean square (RMS) acceleration and cumulative mean square (CMS) stress were obtained. Analysis shows that the RMS acceleration of the mirror is 16.3Grms and the RMS stress of the flexible support is 34.9MPa. Meanwhile, random vibration test was done for verification. Test shows that the mirror’s RMS acceleration is 16.3Grms and the flexible support’s RMS stress is 30.3MPa, indicating the error of 1.8% and 13.2% respectively, which satisfies the accuracy requirements and verifies the validity of presented numerical method.

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large aperture mirror / flexible support / random vibration / test verification

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Dong De-yi;;Xin Hong-wei;Yang Li-Wei;Li Zhi-lai;Guan Ying-Jun. Random vibration analysis and verification for large aperture mirror component[J]. Journal of Vibration and Shock, 2011, 30(11): 74-78