Effective parameter identification of 2D structures from measurements using a scanning laser vibrometer

Jean-Claude Pascal; Jing-Fang Li; Xavier Carniel

doi:10.1117/12.579546

22 June 2004 Effective parameter identification of 2D structures from measurements using a scanning laser vibrometer

Jean-Claude Pascal, Jing-Fang Li, Xavier Carniel

Proceedings Volume 5503, Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2004) https://doi.org/10.1117/12.579546
Event: Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2004, Ancona, Italy

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.

Citation Download Citation

Jean-Claude Pascal, Jing-Fang Li, and Xavier Carniel "Effective parameter identification of 2D structures from measurements using a scanning laser vibrometer", Proc. SPIE 5503, Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 June 2004); https://doi.org/10.1117/12.579546

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