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A wave expansion method for sound absorbing materials
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-0176-5358
Université du Maine, Laboratoire d'Acoustique de l'Université du Maine, France.
2015 (English)In: 22nd International Congress on Sound and Vibration, ICSV22, 2015, Vol. 4, 2797-2804 p.Conference paper (Refereed)
Abstract [en]

In this paper, a wave expansion method is developed to predict the absorption of sound in poro- elastic materials. Poroelastic materials are often used in noise control applications where they are connected to a fluid medium in order dissipate acoustic waves through viscous, thermal and structural effects. The efficient numerical modelling of sound propagation in such materials is therefore of practical interest for many engineering applications. A wave expansion method is de- veloped here to model the propagation through coupled fluid and poroelastic materials. The wave expansion method uses fundamental solutions of the wave operator and so accurate solutions to linearised propagation equations may be obtained with only two-to-three points per wavelength, which is significantly less than the six-to-ten points per wavelength needed for comparable tra- ditional finite difference and finite element methods. The method is also robust to meshing and could be implemented in a meshless manner. These characteristics make it well suited to examin- ing sound absorption applications. The method is applied to a benchmark problem and the results are compared to the analytical solution. The method is found to be very promising. 

Place, publisher, year, edition, pages
2015. Vol. 4, 2797-2804 p.
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-163042ScopusID: 2-s2.0-84971268518OAI: diva2:798443
The 22nd International Congress on Sound and Vibration, ICSV22; Florence, Italy, 12-16 July 2015

QC 20160425

Available from: 2015-03-26 Created: 2015-03-26 Last updated: 2016-08-22Bibliographically approved

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