A fast vibro-acoustic response analysis method for double wall structures including a viscothermal air layer

T.G.H. Basten, F.P. Grooteman

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Abstract

The damping behaviour of a thin air layer between two flexible panels can be used to reduce sound radiation of structural excited panels. The numerical model of the double wall panels takes into account full acousto-elastic interaction and viscothermal wave propagation in the air layer. This means that the resulting system matrices are complex and frequency dependent which makes it difficult to perform response calculations. In this paper a very efficient calculation method is presented which is based on the superposition of uncoupled structural and acoustic eigenmodes. The frequency dependent behaviour is implemented by updating the reduced acoustic submatrices for each frequency step. The method is successfully implemented in the B2000 processor B2FRF.
Original languageEnglish
Number of pages8
Publication statusPublished - 2000
Event3rd B2000/MEMCOM Workshop 2000 - University of Twente, Enschede, Netherlands
Duration: 27 Nov 200028 Nov 2000

Workshop

Workshop3rd B2000/MEMCOM Workshop 2000
CountryNetherlands
CityEnschede
Period27/11/0028/11/00
OtherNovember 27-28, 2000

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    Basten, T. G. H., & Grooteman, F. P. (2000). A fast vibro-acoustic response analysis method for double wall structures including a viscothermal air layer. Paper presented at 3rd B2000/MEMCOM Workshop 2000, Enschede, Netherlands.