Yj. Kang et Js. Bolton, A FINITE-ELEMENT MODEL FOR SOUND-TRANSMISSION THROUGH FOAM-LINED DOUBLE-PANEL STRUCTURES, The Journal of the Acoustical Society of America, 99(5), 1996, pp. 2755-2765
In this paper, methods for coupling both elastic porous material (i.e.
, foam) and structural finite elements with either modal or finite ele
ment representations of acoustical system are presented. In addition,
interface conditions are described for coupling elastic porous materia
l finite elements with acoustical and structural finite elements in va
rious configurations. The foam finite element is based on the elastic
porous material theory of Biot. By considering sound transmission thro
ugh layered systems placed in a waveguide, the accuracy of the coupled
acoustical-structural-foam finite element model has been verified by
comparing its transmission loss predictions with analytical solutions
for the matching cases of infinite lateral extent. The constraint cond
itions at the edges of both the foam lining and the facing panels were
found to have a significant effect on the normal incidence sound tran
smission loss of the double panel system at low frequencies. (C) 1996
Acoustical Society of America.