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Dynamic characterization of viscoelastic porous foams used in vehicles based on an inverse finite element method
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.ORCID-id: 0000-0002-9031-3662
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.
2014 (Engelska)Ingår i: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 135, nr 4, s. 1834-1843Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Viscoelastic properties of porous materials, typical of those used in vehicles for noise insulation and absorption, are estimated from measurements and inverse finite element procedures. The measurements are taken in a near vacuum and cover a broad frequency range: 20 Hz to 1 kHz. The almost cubic test samples were made of 25mm foam covered by a "heavy layer" of rubber. They were mounted in a vacuum chamber on an aluminum table, which was excited in the vertical and horizontal directions with a shaker. Three kinds of response are measured allowing complete estimates of the viscoelastic moduli for isotropic materials and also providing some information on the degree of material anisotropicity. First, frequency independent properties are estimated, where dissipation is described by constant loss factors. Then, fractional derivative models that capture the variation with frequency of the stiffness and damping are adapted. The measurement setup is essentially two-dimensional and calculations are three-dimensional and for a state of plane strain. The good agreement between measured and calculated response provides some confidence in the presented procedures. If, however, the material model cannot fit the measurements well, the inverse procedure yields a certain degree of arbitrariness to the parameter estimation.

Ort, förlag, år, upplaga, sidor
2014. Vol. 135, nr 4, s. 1834-1843
Nyckelord [en]
Mechanical Parameters, Biots Equations, Melamine Foam, Model
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-148268DOI: 10.1121/1.4868361ISI: 000338307200024Scopus ID: 2-s2.0-84920403923OAI: oai:DiVA.org:kth-148268DiVA, id: diva2:736092
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QC 20140805

Tillgänglig från: 2014-08-05 Skapad: 2014-08-04 Senast uppdaterad: 2017-12-05Bibliografiskt granskad

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