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Sound propagation in periodic urban areas

Abstract : This paper presents an experimental and numerical study of low frequency sound propagation in regular urban areas, under the assumption of periodic distribution of buildings. In studying extended distributions of buildings, such assumption is convenient to model the sound propagation, as much as it describes reasonably well some real situations. Specific properties of periodic media, in particular the presence of bandgaps, are investigated. A particular attention is paid to the influence of the opening and radiation above the periodic lattice. For this purpose, results are compared with an identical lattice, closed at the upper part. The problem is tackled using a coupled modal-Finite Elements method. The main idea is to turn the original unbounded domain into an equivalent waveguiding structure, with the appropriate boundary conditions. The experimental study is performed in a scale model of urban area. Numerical and experimental results are in good agreement and show, notably, that bandgap effects remain in such open periodic lattices.
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https://hal.archives-ouvertes.fr/hal-00810887
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Submitted on : Monday, April 23, 2012 - 10:00:00 AM
Last modification on : Monday, March 15, 2021 - 4:17:54 PM
Long-term archiving on: : Sunday, December 18, 2016 - 3:13:38 PM

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Miguel Moleron, Simon Félix, Vincent Pagneux, Olivier Richoux, Judicaël Picaut. Sound propagation in periodic urban areas. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810887⟩

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