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Proceedings Paper

Time-average fringe method for vibration mode analysis
Author(s): Xianyu Su; Qican Zhang; Yongfu Wen; Liqun Xiang
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Paper 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.

Paper Details

Date Published: 14 April 2010
PDF: 6 pages
Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 752257 (14 April 2010); doi: 10.1117/12.851617
Show Author Affiliations
Xianyu Su, Sichuan Univ. (China)
Qican Zhang, Sichuan Univ. (China)
Yongfu Wen, Sichuan Univ. (China)
Liqun Xiang, Sichuan Univ. (China)

Published in SPIE Proceedings Vol. 7522:
Fourth International Conference on Experimental Mechanics
Chenggen Quan; Kemao Qian; Anand Krishna Asundi; Fook Siong Chau, Editor(s)

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