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Wave propagation in sandwich panels with a poroelastic core
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.
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.ORCID-id: 0000-0002-3609-3005
2014 (Engelska)Ingår i: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 135, nr 5, s. 2683-2693Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Wave propagation in sandwich panels with a poroelastic core, which is modeled by Biot's theory, is investigated using the waveguide finite element method. A waveguide poroelastic element is developed based on a displacement-pressure weak form. The dispersion curves of the sandwich panel are first identified as propagating or evanescent waves by varying the damping in the panel, and wave characteristics are analyzed by examining their motions. The energy distributions are calculated to identify the dominant motions. Simplified analytical models are also devised to show the main physics of the corresponding waves. This wave propagation analysis provides insight into the vibro-acoustic behavior of sandwich panels lined with elastic porous materials.

Ort, förlag, år, upplaga, sidor
2014. Vol. 135, nr 5, s. 2683-2693
Nyckelord [en]
Finite-Element-Method, Sound-Transmission, Fluid, Motion, Equations, Guides, Plates, Formulations, Prediction, Media
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-147053DOI: 10.1121/1.4869090ISI: 000336160000027Scopus ID: 2-s2.0-84900430416OAI: oai:DiVA.org:kth-147053DiVA, id: diva2:728310
Anmärkning

QC 20140624

Tillgänglig från: 2014-06-24 Skapad: 2014-06-23 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Ingår i avhandling
1. Wave Modelling Techniques for Medium and High Frequency Vibroacoustic Analysis Including Porous Materials
Öppna denna publikation i ny flik eller fönster >>Wave Modelling Techniques for Medium and High Frequency Vibroacoustic Analysis Including Porous Materials
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Numerical methods based on wave modelling are explored for the vibroacoustic analysis of wave propagation, sound transmission and interior noise in vehicles and buildings at medium and high frequencies. The presence of sound absorbing porous materials in practical engineering structures is also considered. The wave modelling techniques provide computational efficiency and physical insight, and two such methods having these advantages are developed in this thesis namely: the semi-analytical finite element method and the wave expansion method.

The semi-analytical finite element method is applicable to structures which have constant properties in one direction, and it uses a finite element discretization of the cross-section and analytical functions in the third direction. Equations of motion are derived from this method to study wave propagation characteristics, which help understand the vibroacoustic behavior of structures. These characteristics may also be used by high frequency techniques, such as statistical energy analysis. The wave propagation in sandwich panels with a poroelastic core, which is modeled with Biot's theory, is investigated thoroughly.

The semi-analytical finite element method retains the flexibility of the finite element method on geometry and also dramatically increases the computational speed thanks to the orthogonality of the analytical functions when used to calculate forced response. The calculated response of partitions is integrated into diffuse field sound transmission loss calculations of, for example, built-up train floor partitions and multilayer panels lined with porous materials. The calculations are computationally efficient and show good agreement with measurements, thus it is interesting for industrial optimizations.

The wave expansion method uses a priori defined plane wave solutions to the Helmholtz equation for approximation of the sound field in geometrically complex enclosures. It reduces the requirements regarding the number of degrees of freedom compared to the finite element method, which, furthermore, is polluted by dispersion errors. Therefore, the wave expansion method is particularly appealing for high frequency (or large wavenumber) calculations. Its application in interior sound field predictions is assessed within the automobile context.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2014. s. xvi, 46
Serie
TRITA-AVE, ISSN 1651-7660 ; 2014:51
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
urn:nbn:se:kth:diva-151271 (URN)978-91-7595-269-7 (ISBN)
Disputation
2014-10-01, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:15 (Engelska)
Opponent
Handledare
Forskningsfinansiär
EU, FP7, Sjunde ramprogrammet, 214909
Anmärkning

QC 20140916

Tillgänglig från: 2014-09-17 Skapad: 2014-09-16 Senast uppdaterad: 2014-09-17Bibliografiskt granskad

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