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

Lam, YW 2004, 'A boundary element method for the calculation of noise barrier insertion loss in the presence of atmospheric turbulence' , Applied Acoustics, 65 (6) , pp. 583-603.

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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.

Item Type: Article
Themes: Subjects / Themes > Q Science > QC Physics > QC221-246 Acoustics - Sound
Subjects / Themes > Q Science > QC Physics
Subjects outside of the University Themes
Schools: Colleges and Schools > College of Science & Technology > School of the Built Environment
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Acoustics Research Centre
Journal or Publication Title: Applied Acoustics
Publisher: Elsevier
Refereed: Yes
ISSN: 0003-682X
Depositing User: H Kenna
Date Deposited: 10 Sep 2007 10:38
Last Modified: 20 Aug 2013 16:47
URI: http://usir.salford.ac.uk/id/eprint/416

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