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Proceedings Paper

Computer gratings for vibration analysis
Author(s): C. M. Wong; Anand Krishna Asundi
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Paper Abstract

The reflection moire is a well known method to analyze the out-of-plane slope and curvature of a plate. It has also been applied to obtain the mode shape of a plate vibrating at resonance. The sensitivity of the method depends on the pitch of grating and the set-up parameters. In order to increase the sensitivity, the set-up or pitch of grating needs to be changed. Besides that, patterns produced with ordinary gratings have to be filtered to increase contrast. Using computer grating with image processing, the gratings can be quickly and readily changed and images can be enhanced. In this paper, the reflection moire method using computer grating is proposed to inspect the mode shapes of vibrating plates. A method to calculate the frequency of a vibrating plate using scanning frequency of screen is also introduced. Some of the routines for fringe enhancement are quasi-real-time while other routines are more computationally intensive.

Paper Details

Date Published: 18 January 1993
PDF: 10 pages
Proc. SPIE 1713, International Conference on Manufacturing Automation, (18 January 1993); doi: 10.1117/12.138485
Show Author Affiliations
C. M. Wong, Univ. of Hong Kong (Hong Kong China)
Anand Krishna Asundi, Univ. of Hong Kong (Hong Kong China)

Published in SPIE Proceedings Vol. 1713:
International Conference on Manufacturing Automation
Anand Krishna Asundi; S. T. Tan, Editor(s)

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