Hybrid piezo-poroelastic sound package concept : numerical/experimental validations

The presented work deals with hybrid reduction of acoustic transmission through a sandwich panel. A piezoelectric actuator is added to a classical sound package made up of two elastic plates and a poroelastic core. A complete description of the sandwich dynamical behaviour is obtained using a finite element implementation in Comsol r environment. The poroelastic material is modeled using a pressure-displacement formulation. The piezoelectric effects are also included. Interactions between all layers are then fully considered. The transmission loss of such a panel is numerically predicted. It is shown, that the active patches improve performance in low frequencies, whereas passive layers are known to be efficient at high frequencies. Predicted results for these two operating modes are compared to experimental data. Discrepancies are discussed in terms of coupling and boundary conditions mainly. Numerical updating of the sandwich finite element model is also considered.