Sound radiated in a cavity by a vibrating plate: Comparison between the results of a finite element method (FEMAK) and a boundary element method (NoVAlea2D)

The coupling between a cavity and a vibrating plate is written as a strong coupling where both the continuity of stresses and particle velocities at t he interface are taken into account. A FEM analysis reveals an important co upling between the first mode of the plate and the cavity. The pressure dis tribution in the cavity shows a strong quarter of a wave length pattern ind icating the influence of the first Dirichlet mode in the cavity. The vibrating plate is then excited by a turbulent flow modelled by its spe ctral density using the Corcos model. A comparison is made between the resu lts obtained from a FEM and a BEM formulation. Good agreements are observed concerning the plate displacements. The comparison of the cavity sound pre ssure levels is less good.