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A boundary element method for the calculation of noise barrier insertion loss in the presence of atmospheric turbulence

Lam, YW

A boundary element method for the calculation of noise barrier insertion loss in the presence of atmospheric turbulence Thumbnail


Authors

YW Lam



Abstract

Atmospheric turbulence is an important factor that limits the amount of attenuation a barrier can provide in the outdoor environment. It is therefore important to develop a reliable method to predict its effect on barrier performance. The boundary element method (BEM) has been shown to be a very effective technique for predicting barrier insertion loss in the absence of turbulence. This paper develops a simple and efficient modification of the BEM formulation to predict the insertion loss of a barrier in the presence of atmospheric turbulence. The modification is based on two alternative methods: (1) random realisations of log-amplitude and phase fluctuations of boundary sources and (2) de-correlation of source coherence using the mutual coherence function (MCF). An investigation into the behaviours of these two methods is carried out and simplified forms of the methods developed. Some systematic differences between the predictions from the methods are found. When incorporated into the BEM formulation, the method of random realisations and the method of MCF de-correlation provide predictions that agree well with predictions by the parabolic equation method and by the scattering cross-section method on a variety of thin barrier configurations.

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Citation

Lam, Y. (2004). A boundary element method for the calculation of noise barrier insertion loss in the presence of atmospheric turbulence. Applied Acoustics, 65(6), 583-603. https://doi.org/10.1016/j.apacoust.2003.10.009

Journal Article Type Article
Acceptance Date Oct 13, 2003
Online Publication Date Feb 5, 2004
Publication Date Jun 1, 2004
Deposit Date Oct 10, 2011
Publicly Available Date Apr 5, 2016
Journal Applied Acoustics
Print ISSN 0003-682X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 65
Issue 6
Pages 583-603
DOI https://doi.org/10.1016/j.apacoust.2003.10.009
Publisher URL http://dx.doi.org/10.1016/j.apacoust.2003.10.009
Related Public URLs http://www.sciencedirect.com/science/journal/0003682X

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