Affiliations: Ecole Nationale Supérieure d'Ingénieurs du Mans
(ENSIM) and Institut d'Acoustique et de Mécanique (IAM), Université du
Maine, rue Aristote, 72000 Le Mans, France | Visual VibroAcoustics, 51 rue d'Alger, 72000 Le Mans,
France | Centre Technique des Industries Mécaniques (CETIM),
52 avenue Felix-Louat BP 80067, 60300 Senlis, France
Note: [] Corresponding author: Prof. Jean-Claude Pascal, Ecole Nationale
Supérieure d'Ingénieurs du Mans (ENSIM), Université du Maine, rue
Aristote,, 72085 Le Mans CEDEX 09, France. Tel.: +33 2 43 83 39 53; Fax: +33 2
43 83 37 94; E-mail: [email protected]
Abstract: The technique of processing data in the wavenumber domain based on
the Spatial Fourier Transform (SFT), is a powerful tool to compute higher-order
partial derivatives occurred in the expressions of the structural intensity and
its divergence. However, performing directly the SFT usually results in great
distortions if a discontinuity occurs in spatial periodicity (leakage effect).
The worst thing is that the divergence of a free plate cannot correctly be
estimated by existing wavenumber processing such as the STF and zero padding
method. In this paper, a new algorithm -- mirror processing, is developed. By
the use of vibrating velocity measured from the technique of laser scanning
vibrometry, the structural intensity, its divergence and the force distribution
are evaluated by different techniques of wavenumber processing. It is shown
that the distortions caused by leakage effects can be removed by using advanced
algorithms.
