EuroNoise2015 location:Maastricht, the Netherlands date:1-3 June 2015
Poroelastic materials are often applied as eective noise measures. They are, however, most eective
at higher frequencies. A lot of research has been performed to increase absorption also at lower
frequencies. A promising solution is to add inhomogeneities to the foams, being inclusions or perforations.
Recently, a Wave Based Method was developed to predict the dynamic response of poroelastic
materials, described by the theory of Biot. This Trefftz approach was shown to be very effective for
geometrically simple problems. A sufficient condition for the method to converge is that the considered
problem domain is convex. Non-convex domains have to be partitioned into convex subdomains.
Consequently, domains with circular inclusions cannot be accurately accounted for with the Wave
Based Method; this problem was overcome with the so-called Multi-Level framework, which was
introduced for acoustic and structural dynamic problems. This paper extends the Multi-Level approach
to efficiently account for inclusions in a poroelastic material. The method is validated through
comparison to the Finite Element Method.