Computer gratings for vibration analysis

C. M. Wong; Anand Krishna Asundi

doi:10.1117/12.138485

18 January 1993 Computer gratings for vibration analysis

C. M. Wong, Anand Krishna Asundi

Proceedings Volume 1713, International Conference on Manufacturing Automation; (1993) https://doi.org/10.1117/12.138485
Event: International Conference on Manufacturing Automation, 1992, Hong Kong, Hong Kong

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.

Citation Download Citation

C. M. Wong and Anand Krishna Asundi "Computer gratings for vibration analysis", Proc. SPIE 1713, International Conference on Manufacturing Automation, (18 January 1993); https://doi.org/10.1117/12.138485

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