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Vibro-Acoustic Analysis of a
Double Sandwich Panels System
Lotfi HAMMAMI, Sofiene FENINA, Moez
ABDENNADHER, Mohamed HADDAR
Research Unit of
Mechanical, Modelization and Manufacturing
National school of
engineers of Sfax, B.P.W. 3038 Sfax Tunisia
E-Mail: m-haddar@voila.fr
The dynamic behaviour of a double sandwich panels system requires the
modelling of their dynamic behaviour and air cavity and fluid structure
interaction. In this paper, the
associated energy functional formulation is established. Its discretisation
using the finite element method leads to the dynamic system equation. Numerical vibratory analysis shows in one
hand the existence of two eigenmodes families for which the vibroacoustic
coupling between panels and air cavity is absent for the first one and strong
for the second. It allows the calculation of modal damping matrix coefficients. A modal approach is adopted to establish the dynamic responses of
this system. The dynamic results show an important reduction of vibration in
comparison with simple sandwich panels in the frequency domain of practical
interest.
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