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Acoustic propagation over periodic and quasi-periodic rough surfaces

Berry, David; Taherzadeh, Shahram; Stronach, Alexander and Attenborough, Keith (2016). Acoustic propagation over periodic and quasi-periodic rough surfaces. In: Proceedings of the Institute of Acoustics, 38(1) pp. 126–132.

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Abstract

Transport noise is an ever present concern in urban areas affecting the quality of life for millions of people. The traditional noise barrier is not always a convenient method of noise control and can divide communities. Deliberate introduction of small scale (0.3 m high or less) periodic roughness on otherwise acoustically-hard ground has been investigated as a way of reducing noise near to a surface transport corridor. The roughness alters the effective surface impedance of the ground and thereby creates a 'soft' ground effect. Moreover the effectiveness if the rough surface is not reduced significantly if there are pathways through it. However the rough ground also creates surface waves that must be absorbed for the noise reduction to be effective. An alternative way of reducing surface waves may be to alter the periodicity. The effects of altering the periodicity of circular rods placed on a hard surface in the laboratory have been investigated. Predictions of multiple scattering theory and a boundary element code have been compared with the experimental data.

Item Type: Conference or Workshop Item
ISBN: 1-906913-24-2, 978-1-906913-24-3
ISSN: 1478-6095
Project Funding Details:
Funded Project NameProject IDFunding Body
internalNot SetThe Open University (OU)
Keywords: sound propagation, rough surfaces
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 47315
Depositing User: Shahram Taherzadeh
Date Deposited: 16 Sep 2016 10:02
Last Modified: 12 Nov 2016 14:48
URI: http://oro.open.ac.uk/id/eprint/47315
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