A hybrid finite element-transfer matrix model for vibroacoustic systems with flat and homogeneous acoustic treatments

Type de document

Études primaires

Année de publication

2015

Langue

Anglais

Titre de la revue

Journal of the Acoustical Society of America

Première page

976

Dernière page

988

Résumé

Practical vibroacoustic systems involve passive acoustic treatments consisting of highly dissipative media such as poroelastic materials. The numerical modeling of such systems at low to mid frequencies typically relies on substructuring methodologies based on finite element models. Namely, the master subsystems (i.e., structural and acoustic domains) are described by a finite set of uncoupled modes, whereas condensation procedures are typically preferred for the acoustic treatments. However, although accurate, such methodology is computationally expensive when real life applications are considered. A potential reduction of the computational burden could be obtained by approximating the effect of the acoustic treatment on the master subsystems without introducing physical degrees of freedom. To do that, the treatment has to be assumed homogeneous, flat, and of infinite lateral extent. Under these hypotheses, simple analytical tools like the transfer matrix method can be employed. In this paper, a hybrid finite element–transfer matrix methodology is proposed. The impact of the limiting assumptions inherent within the analytical framework are assessed for the case of plate-cavity systems involving flat and homogeneous acoustic treatments. The results prove that the hybrid model can capture the qualitative behavior of the vibroacoustic system while reducing the computational effort.

Mots-clés

Isolation phonique, Sound isolation, Panneau absorbant, Sound absorbing panel, Matériau insonorisant, Sound absorbing material, Matière poreuse, Porous material, Indice d'affaiblissement sonore, Sound transmission loss

Numéro de projet IRSST

0099-5650

Ce document n'est pas disponible pour le moment.

Partager

COinS