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
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.