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Vibro-acoustic energy propagation in anisotropic, anelastic porous materials
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Numerical acoustics. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-1855-5437
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.
2014 (English)In: Proceedings of the 9th International Conference on Structural Dynamics, EURODYN 2014, 2014, 83-90 p.Conference paper, Published paper (Refereed)
Abstract [en]

Historically, the modelling of the acoustics of poro-elastic materials (APEMs) has assumed the materials to be isotropic in both their elastic as well as their acoustic properties including the dissipative mechanisms related to viscous, inertialand thermal interactions. While this is a reasonable approximation when the absorption of sound is of interest, it fails to provide meaningful results for most foamed materials in general and for certain sets of boundary conditions involving elastic contact with solids or other APEMs in particular. A general modelling of fully anisotropic APEMs will be reviewed and taken as a starting point for a series of numerical experiments focussing on aspects of propagation of vibro-acoustic energy, in a homogeneous layer as well as in multiple layer arrangements. From previous works it is known that the influence of anisotropy may be quite significant, in particular for structure-borne vibro-acoustic energy. In addition, it is known that the alignment of principal directions may have substantial influence on the transmission of vibro-acoustic energy. These findings will be recalled in order to prepare for a discussion on the aspects of the directional dependence of the anelastic moduli which will be the core of the presentation at the conference. Real material tensors may be constructed from a superposition of these anisotropic contributions, in the most general case, not necessarily sharing the same principal directions. Starting from these fully anisotropic constitutive tensors with general symmetry properties, studies of optimal alignment between conservative and dissipative tensors, as well as between different materials in various configurations of interest, will be illustrated in the lecture.

Place, publisher, year, edition, pages
2014. 83-90 p.
Series
EURODYN-International Conference on Structural Dynamics, ISSN 2311-9020
Keyword [en]
Anisotropic, Anelastic, Poro-elastic materials, Acoustics, Vibrations
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-164933ISI: 000354786600009ISBN: 978-972-752-165-4 (print)OAI: oai:DiVA.org:kth-164933DiVA: diva2:806516
Conference
The 9th International Conference on Structural Dynamics, EURODYN 2014, Porto, Portugal, 30 June - 2 July 2014
Note

QC 20150423

Available from: 2015-04-20 Created: 2015-04-20 Last updated: 2015-08-18Bibliographically approved

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Göransson, Peter

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MWL Numerical acousticsVinnExcellence Center for ECO2 Vehicle designMarcus Wallenberg Laboratory MWL
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