Finite element formulations for structural-acoustic internal problems with poroelastic treatment

Abstract eng:
We propose in this paper to investigate and compare finite element formulations for structural-acoustic problems with soundproofing materials. The coupled system consists of an acoustic cavity with some of its walls covered by an elastic structure and coupled with a porous material. This material can be modeled by a tridimensional poroelastic finite element based on the Biot-Allard theory. Another approach consists of using acoustic normal impedance for modeling the wall absorption. Through an approximation of this impedance by a KelvinVoigt rheological model and using a new scalar unknown in the finite element formulation, the coupled problem can be written directly in time and frequency domains. Some examples are presented in order to illustrate and compare the proposed approaches.

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