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On the influence of frequency-dependent elastic properties in vibro-acoustic modelling of porous materials under structural excitation
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics. KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Numerical acoustics.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0003-1855-5437
Department of Mechanical Engineering, Katholieke Universiteit Leuven, Heverlee, Belgium.
Department of Mechanical Engineering, Katholieke Universiteit Leuven, Heverlee, Belgium.
2014 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 333, no 24, 6560-6571 p.Article in journal (Refereed) Published
Abstract [en]

The aspects related to the frequency dependence of the elastic properties of porous materials have been largely neglected in the past for several reasons. For acoustic excitation of porous materials, the material behaviour can be quite well represented by models where the properties of the solid frame have little influence. Only recently has the importance of the dynamic moduli of the frame come into focus. This is related to a growing interest in the material behaviour due to structural excitation. Two aspects stand out in connection with the elastic-dynamic behaviour. The first is related to methods for the characterisation of the dynamic moduli of porous materials. The second is a perceived lack of numerical methods able to model the complex material behaviour under structural excitation, in particular at higher frequencies. In the current paper, experimental data from a panel under structural excitation, coated with a porous material, is used in correlation with numerical predictions, involving a frequency-dependent material model for the stiffness properties of the porous material. The results suggest that the frequency dependence is of importance for a correct prediction of the response of trim installations. The change in material behaviour due to the frequency-dependent properties is illustrated in terms of the propagation of the slow wave and the shear wave in the porous material.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 333, no 24, 6560-6571 p.
National Category
Textile, Rubber and Polymeric Materials Aerospace Engineering Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-137743DOI: 10.1016/j.jsv.2014.07.032ISI: 000342547500017Scopus ID: 2-s2.0-84907486439OAI: oai:DiVA.org:kth-137743DiVA: diva2:679681
Note

Updated from submitted to published.

QC 20141105

Available from: 2013-12-16 Created: 2013-12-16 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Vibro-acoustic modelling of anisotropic poroelastic materials: characterisation of the anisotropic properties
Open this publication in new window or tab >>Vibro-acoustic modelling of anisotropic poroelastic materials: characterisation of the anisotropic properties
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The present-day challenges in the transport industry, steered by the increasing environmental awareness, necessitate manufacturers to take measures to reduce emissions related to the movements of goods and humans. In particular, the measures aiming at a reduced mass or higher load capacity to increase fuel efficiency,  generally deteriorate the noise and vibration insulation properties of their products. In order to comply with the regulations and customer demands, modern vehicles increasingly move towards a multifunctional integrated design approach, if possible for all subcomponents involved. Such a multifunctional design approach is an iterative process, evaluating the proposed solutions in every stage, and is therefore best performed in a virtual testing environment. \\Poroelastic materials are interesting to include in a multifunctional design, offering reasonably good vibro-acoustic insulation properties at a low weight penalty. These materials can also be combined in multilayer arrangements to further enhance the overall performance. \\In order to achieve an accurate modelling of the vibro-acoustic behaviour of poroelastic materials, the input data describing the material properties should be of a high quality. Two characteristics inherent to these materials encumber a precise characterisation with traditional techniques. Poro-elastic aggregates are anelastic due to the constituent material used, and anisotropic as a consequence of the production process. Characterisation techniques allowing for an accurate determination of the material properties need to take these intrinsic characteristics into account.\\The objective in this thesis is to enable the characterisation of a constitutive material model for poroelastic materials which is as general as possible, and includes the inherent material anelasticity and anisotropy. For this purpose, a set of advanced characterisation techniques has been developed to characterise the anisotropic flow resistivity tensor and the anisotropic dynamic Hooke's tensor. \\These advanced characterisation techniques are based on an inverse estimation procedure, used consistently throughout the work, and includes both experiments and numerical predictions. The property to characterise is isolated in a specially designed set-up such that it can be modelled by physics solely involving this property. The obtained experimental and numerical data then serve as the input to an optimisation, which returns the material properties for which the difference between both is as small as possible. These methods have been successfully applied to melamine foam, which is found to be both anisotropic and anelastic, confirming the need for such advanced characterisation techniques.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xiv, 58 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2013:67
National Category
Fluid Mechanics and Acoustics Textile, Rubber and Polymeric Materials
Identifiers
urn:nbn:se:kth:diva-137809 (URN)978-91-7501-983-3 (ISBN)
Public defence
2014-01-20, sal F3, KTH, Lindstedtsvägen 26, Stockholm, 13:15 (English)
Opponent
Supervisors
Funder
EU, European Research Council, MRTN-CT-2006-035559
Note

QC 20131219

Available from: 2013-12-19 Created: 2013-12-16 Last updated: 2013-12-19Bibliographically approved

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Göransson, Peter

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