Reference-free mode shape identification with a continuously scanning laser Doppler vibrometer (SLDV)

Yuen Kim Ho; David J. Ewins

doi:10.1117/12.429545

13 June 2001 Reference-free mode shape identification with a continuously scanning laser Doppler vibrometer (SLDV)

Yuen Kim Ho, David J. Ewins

Proceedings Volume 4317, Second International Conference on Experimental Mechanics; (2001) https://doi.org/10.1117/12.429545
Event: Second International Conference on Experimental Mechanics, 2000, Singapore, Singapore

Abstract

This paper present an analysis technique that uses vibration response data from a continuously Scanning Laser Doppler Vibrometer (SLDV) to determine both the mode shape modulus and the temporal phase relationships by means of the Time Domain Fourier Filter Output method. Verification of this technique is first performed using numerically generated data from the exact solution of a cantilever beam, to simulate experimental measurements with the SLDV. Finally, an experiment is presented to show that this technique works well for determining both the modulus and the temporal phase of mode shapes using only the velocity output form an SLDV without any reference force signal.

Citation Download Citation

Yuen Kim Ho and David J. Ewins "Reference-free mode shape identification with a continuously scanning laser Doppler vibrometer (SLDV)", Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); https://doi.org/10.1117/12.429545

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