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3D hierarchical hp-FEM applied to elasto-acoustic modelling of layered porous media
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
2005 (Engelska)Ingår i: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 285, nr 1-2, s. 341-363Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This paper presents a 3-D hierarchical (p-version) finite element description of the solid displacement-fluid displacement form of Biot's equation for elasto-acoustic modelling of multiple-layered isotropic porous media. The convergence related to mesh refinement extensions for different orders of polynomial approximation is briefly discussed for a homogeneous foam. The highest computational efficiency for reasonable levels of the error in the low-frequency region was obtained for fourth-order polynomial finite element interpolations. The main focus is on coupling conditions and on the convergence of solutions to Biot's equations in cases with multiple layers having different material properties. Simulations of a two-layered porous material with low flow resistivity suggest slow convergence rate of the fluid displacement field close to the interface between the layers.

Ort, förlag, år, upplaga, sidor
2005. Vol. 285, nr 1-2, s. 341-363
Nyckelord [en]
FORMULATION, PROPAGATION, EQUATIONS, 3-D
Nationell ämneskategori
Farkostteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-13421DOI: 10.1016/j.jsv.2004.08.032ISI: 000229701800017Scopus ID: 2-s2.0-18544381093OAI: oai:DiVA.org:kth-13421DiVA, id: diva2:325285
Anmärkning
QC 20100618Tillgänglig från: 2010-06-18 Skapad: 2010-06-18 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
1. Hierarchical finite element modelling of Biot's equations for vibro-acoustic modelling of layered poroelastic media
Öppna denna publikation i ny flik eller fönster >>Hierarchical finite element modelling of Biot's equations for vibro-acoustic modelling of layered poroelastic media
2004 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis concerns three-dimensional finite element modelling of Biot's equations for elasto-acoustic modelling of wave propagation in layered media including porous elastic materials. The concept of hierarchical (p-version) finite elements are combined with various weak forms of Biot's equations. Computationally efficient methods providing accurate solutions of sound propagation in layered porous media are discussed. The research falls within the areas linear acoustics and numerical acoustics. Important applications of the developed methods may be found within vehicle interior acoustics, e.g. engineering design of damping treatment based on multiple layers of porous materials.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2004. s. xiv
Serie
Trita-AVE, ISSN 1651-7660 ; 2004:46
Nyckelord
Engineering physics, finite element, hierarchical, Biot, porous material, vibro-acoustic, Teknisk fysik
Nationell ämneskategori
Annan teknik
Identifikatorer
urn:nbn:se:kth:diva-95 (URN)91-7283-927-9 (ISBN)
Disputation
2004-12-12, kollegiesalen, Valhallavägen 79, Stockholm, 14:15
Opponent
Handledare
Anmärkning
QC 20100618Tillgänglig från: 2004-12-10 Skapad: 2004-12-10 Senast uppdaterad: 2012-03-13Bibliografiskt granskad

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Hörlin, Nils-Erik
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