Vibroacoustic analysis of cyclic structures by using dof's size reduction and holographic measurements

Issue title: XI Diname

Article type: Research Article

Authors: Hami, Abdelkhalak El | Borza, Dan | Souza de Cursi, José Eduardo

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

Note: [] Corresponding author: Dan Borza, INSA de Rouen, LMR, Avenue de l'Université B.P. 8, 76801 Saint-Etienne du Rouvray, France. Tel./Fax: +33 2 32 95 97 42; E-mail: [email protected]

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.

Keywords: Vibroacoustics, modal analysis, model reduction, holography, symmetry groups

Journal: Shock and Vibration, vol. 13, no. 4-5, pp. 355-366, 2006