Abstract:

Today, the prediction of the poroelastoacoustic response of multilayered porous media acoustically or mechanically excited for noise control applications, is of major concern in fields such as aeronautics, the automotive industry, building acoustics, or environmental acoustics. In this talk, a technique to evaluate the two-dimensional poroelastoacoustic response of a multilayered planar porous material due to both acoustical and mechanical line sources is presented. The technique based on a Fourier wave transform takes into account propagation phenomena into both the porous material skeleton and pores. Using the equations derived from the homogeneization theory for fluid-saturated porous media, propagation constants for the P1, P2 compressional wave and the S shear wave are determined. Applying boundary conditions at the media interfaces yields a linear system of equations in terms of reflection and transmission coefficients. This allows for the calculation of displacement amplitudes of the allowed wave motions in each medium. Numerical results showing the poroelastoacoustic responses (sound pressure level above the material, mean-square velocity of the skeleton at the air--porous interface, surface impedances) of several porous materials are presented in the case of both excitations.