Time-average fringe method for vibration mode analysis

Xianyu Su; Qican Zhang; Yongfu Wen; Liqun Xiang

doi:10.1117/12.851617

14 April 2010 Time-average fringe method for vibration mode analysis

Xianyu Su, Qican Zhang, Yongfu Wen, Liqun Xiang

Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 752257 (2010) https://doi.org/10.1117/12.851617
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

Abstract

A new optical method of vibration mode analysis using time-average fringe is presented in this paper. A sequence of the deformed and partly blurred sinusoidal fringe images on the surface of a vibrating membrane are grabbed by a low sampling rate commercial CCD camera. By Fourier transform, filtering, inverse Fourier transform, the vibration mode is obtained from the fundamental component of the Fourier spectrum. The theoretical analysis of this approach is given. Computer simulations and experiments have proved to verify its validity. Under different excited vibration frequencies, the vibration modes of a vibrating surface can be qualitatively analyzed. In the experiment, when the excited vibration frequency changes continuously, the changing process of the vibration modes of membrane is observed clearly. Experimental results show that this approach as the features of rapid speed, high accuracy, and simple experimental set-up.

Citation Download Citation

Xianyu Su, Qican Zhang, Yongfu Wen, and Liqun Xiang "Time-average fringe method for vibration mode analysis", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 752257 (14 April 2010); https://doi.org/10.1117/12.851617

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