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Proceedings Paper

Effective parameter identification of 2D structures from measurements using a scanning laser vibrometer
Author(s): Jean-Claude Pascal; Jing-Fang Li; Xavier Carniel
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Paper Abstract

For specific materials, it is necessary to know the dispersion curve associated with the flexural waves, particularly in the case of anisotropic composite materials whose parameters are not known a priori. The method described here is based on energy concepts. It uses the vibration velocity measured by scanning laser Doppler vibrometer. The Spatial Fourier Transform (SFT) of vibration velocity field is used to compute the spatial derivatives of velocity which are then used to obtain energy quantities. The dispersion curve and the loss factor are computed from these quantities. It is shown that the use of these energy quantities leads to results independent to the analysis resolution in the wavenumber space, countrary to the direct extraction obtained by looking for the maximum values in the phase spectrum. The pre-processing allows one to eliminate the disturbances brought by the mechanical excitation zones and plate edges. Furthermore, the mechanical parameters for plane structures such as dynamic stiffness and loss factor, are estimated by this technique. This method can be extended to orthotropic and anisotropic structures. Experimental results are presented.

Paper Details

Date Published: 22 June 2004
PDF: 8 pages
Proc. SPIE 5503, Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 June 2004); doi: 10.1117/12.579546
Show Author Affiliations
Jean-Claude Pascal, Univ. du Maine (France)
Jing-Fang Li, Visual VibroAcoustics (France)
Xavier Carniel, Ctr. Technique des Industries Mecaniques (France)

Published in SPIE Proceedings Vol. 5503:
Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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