Meaning of admittance boundary condition explained on an analytical example of structure fluid coupling

Steffen Marburg, Robert Anderssohn, Hans Juergen Hardtke

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Simulation techniques in the linear acoustics of rooms with arbitrary geometry often lack sufficient knowledge about the dynamics of the surrounding walls. But the latter effect the sound distribution significantly. This is why boundary value problems (BVP) of fully coupled structure fluid systems should be solved. Unless one transforms the discretized form of this BVP into a system of only the sound pressure by means of the Schur complement. This produces a fully occupied coupling admittance matrix within this formulation. Out of sound pressure data it is certainly difficult to reproduce all entries of this matrix. Due to this fact the authors introduce an approximation for the coupling admittance by defining local admittance values on the boundary. This boundary condition type causes a simplification of the coupling admittance matrix. It is demonstrated on a simple structure fluid coupled system whose analytical equations are arranged in a matrix form matching a standard BEM-FEM formulation, followed by a short discussion about its applicability. Copyright

Original languageEnglish
Title of host publication20th International Congress on Acoustics 2010, ICA 2010 - Incorporating Proceedings of the 2010 Annual Conference of the Australian Acoustical Society
Pages1357-1359
Number of pages3
StatePublished - 2010
Externally publishedYes
Event20th International Congress on Acoustics 2010, ICA 2010 - Incorporating the 2010 Annual Conference of the Australian Acoustical Society - Sydney, NSW, Australia
Duration: 23 Aug 201027 Aug 2010

Publication series

Name20th International Congress on Acoustics 2010, ICA 2010 - Incorporating Proceedings of the 2010 Annual Conference of the Australian Acoustical Society
Volume2

Conference

Conference20th International Congress on Acoustics 2010, ICA 2010 - Incorporating the 2010 Annual Conference of the Australian Acoustical Society
Country/TerritoryAustralia
CitySydney, NSW
Period23/08/1027/08/10

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