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Advanced materials and structures for noise control
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Numerical acoustics.ORCID iD: 0000-0003-1855-5437
2006 (English)In: EURONOISE 2006 - The 6th European Conference on Noise Control: Advanced Solutions for Noise Control, 2006Conference paper (Refereed)
Abstract [en]

Lightweight porous automotive acoustic multilayer trim components have been traditionally specified in terms of sound absorption and sound transmission loss performance targets. These targets are valid for airborne noise excitation only, in the medium to high frequency ranges. Unfortunately, this neglects the fact that in real-world applications, these components are also subjected to low-medium frequency structural vibration inputs from the mechanical components, which is typically an acoustic sound radiation problem. For a flexible, open cell porous foam, the transport of energy is carried both through the sound pressure waves propagating through the fluid in the pores, and through the elastic stress waves carried through the solid frame of the material. For a given situation, the balance between energy dissipated through vibration of the solid frame, changes in the acoustic pressure and the coupling between the waves varies with the topological arrangement, choice of material properties, interfacial conditions, etc. This opens for the possibility of tailoring the performance by tuning the different dissipation mechanisms accordingly. This paper then presents some recent developments and results, Finite Element (FE) numerical simulation and material modelling, which allow the tuning and prediction of the of porous multilayer trim components.

Place, publisher, year, edition, pages
Keyword [en]
Acoustic variables control, Multilayers, Structural dynamics
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-82440ScopusID: 2-s2.0-84872495161OAI: diva2:498242
6th European Conference on Noise Control: Advanced Solutions for Noise Control, EURONOISE 2006; Tampere; 30 May 2006 through 1 June 2006

QC 20120528

Available from: 2012-02-11 Created: 2012-02-11 Last updated: 2012-09-07Bibliographically approved

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