Accurate barrier modeling in the presence of atmospheric effects

Wave based solutions of noise barrier geometries accurately model the complex direct, reflected and diffracted sound field interactions. However, these solutions are very computer intensive and thus are not practical as a design tool. Improved diffraction based methods, that include phase, now yield...

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Bibliographic Details
Published in:Applied acoustics 1999-03, Vol.56 (3), p.157-182
Main Authors: Muradali, A, Fyfe, K.R
Format: Article
Language:English
Subjects:
Acoustics
Aeroacoustics, atmospheric sound
Atmospheric modeling
Barriers
Diffraction
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Physics
Road noise
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Summary:Wave based solutions of noise barrier geometries accurately model the complex direct, reflected and diffracted sound field interactions. However, these solutions are very computer intensive and thus are not practical as a design tool. Improved diffraction based methods, that include phase, now yield wave-like accuracy with trivial calculation times. These results, however accurate, typically over-predict the actual performance of noise barriers, because atmospheric effects such as wind, temperature gradients and turbulence have not been considered. To overcome this limitation, a new acoustic modeling tool is proposed that combines an improved diffraction-based sound barrier performance model with a heuristic atmospheric model. Comparisons with the Parabolic Equation (PE), a wave based technique, show good agreements and preliminary applications of this model yield the expected sound barrier performance degradation due to the acoustic medium non-homogeneity.
ISSN:0003-682X
1872-910X
DOI:10.1016/S0003-682X(98)00023-1