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Proceedings Paper

Modal vibration measurement
Author(s): Alexandar Djordjevich; YuZhu He; Y. M. Law
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Paper Abstract

For application in on-line control of elastic vibrations, a control feedback is proposed based on distributed measurement of deflection-curvature. This is achieved using modal curvature gauges, one for each dominant vibration mode: each gauge is sensitive to a designated vibration mode while insensitive to other modes of interest. Only distributed measurements can provide such decoupled modal information and, thus, simplify the vibration control. The number of gauges required equals the number of dominant vibration modes of interest. The proposed `modal curvature gauge' is a generalization of the novel `curvature gauge' reported recently. Unlike the established technology of modal strain sensing, this sensor that combines fiber-optics and laser sources, is particularly suitable for thinner structures. For any strain and any curvature sensor, there exists a breakeven structural thickness separating the application domains of the two, such that curvatures should be measured in structures thinner than this breakeven thickness. It is the thinner structures that are most prone to elastic vibrations in mechanical systems. They also have more distinctly dominant vibration modes.

Paper Details

Date Published: 22 May 2000
PDF: 6 pages
Proc. SPIE 4072, Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2000); doi: 10.1117/12.386738
Show Author Affiliations
Alexandar Djordjevich, City Univ. of Hong Kong (Hong Kong)
YuZhu He, City Univ. of Hong Kong (Hong Kong)
Y. M. Law, City Univ. of Hong Kong (China)

Published in SPIE Proceedings Vol. 4072:
Fourth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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