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Shock and Vibration
Volume 13, Issue 4-5, Pages 355-366
http://dx.doi.org/10.1155/2006/828367

Vibroacoustic Analysis of Cyclic Structures by Using Dof’s Size Reduction and Holographic Measurements

Abdelkhalak El Hami, Dan Borza, and José Eduardo Souza de Cursi

INSA de Rouen, LMR, 76801 St Etienne du Rouvray, France

Received 19 July 2006; Revised 19 July 2006

Copyright © 2006 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We propose a method for the vibroacoustic analysis of structures having symmetry properties. This method is based on the reduction of the number of the degrees of freedom involved (size reduction) and the use of experimental data (confrontation numerical/experimental). We propose the extension of the method of the linear representations of finite symmetry groups to problems of coupling fluid-structure. This approach, while keeping the quality of the approximations, leads to a significant reduction of the number of degrees of freedom, with a maximal reduction for the so called repetitive structures. Finally, we present a practical case of modal analysis – in air and water – of a ship propeller formed by 3 stainless steel blades. The experimental results are obtained by using the whole-field, non-contact technique of electronic holography.