Computational analysis of acoustic transmission through periodically perforated interfaces
Date issued
2009
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of West Bohemia
Abstract
The objective of the paper is to demonstrate the homogenization approach applied to modelling the acoustic transmission
on perforated interfaces embedded in the acoustic fluid. We assume a layer, with periodically perforated
obstacles, separating two half-spaces filled with the fluid. The homogenizationmethod provides limit transmission
conditions which can be prescribed at the homogenized surface representing the “limit” interface. The conditions
describe relationship between jump of the acoustic pressures and the transversal acoustic velocity, on introducing
the “in-layer pressure” which describes wave propagation in the tangent directions with respect to the interface.
This approach may serve as a relevant tool for optimal design of devices aimed at attenuation of the acoustic
waves, such as the engine exhaustmufflers or other structures fitted with sieves and grillages. We present numerical
examples of wave propagation in a muffler-like structure illustrating viability of the approach when complex 3D
geometries of the interface perforation are considered.
Description
Subject(s)
fyzikální akustika, zkoušení materiálu, matematické modelování, numerická simulace
Citation
Applied and Computational Mechanics. 2009, vol. 3, no. 1, p. 111-120.