A Hybrid Model for Investigating the Effect of Scattering from Building Façade on Sound Propagation in Street Canyons

Street canyons are basic components of modern cities. Sound propagation in streets has been proven to be significantly affected by reflections from building façades. In this paper, an iterative model combining acoustic radiosity and the image source method (IMCRI) is proposed to investigate the effe...

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Bibliographic Details
Published inApplied sciences Vol. 9; no. 14; p. 2803
Main Authors Yu, Boya, Ma, Hui, Kang, Jian
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.07.2019
Subjects
Accuracy
Acoustics
Computer simulation
Energy
Facades
full-scale measurement
hybrid model
Model accuracy
Noise control
Propagation
Radiosity
Reverberation time
Scale models
Scattering
scattering reflection
Sound pressure
Sound propagation
Specular reflection
street canyon
Street canyons
Urban areas
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Summary:Street canyons are basic components of modern cities. Sound propagation in streets has been proven to be significantly affected by reflections from building façades. In this paper, an iterative model combining acoustic radiosity and the image source method (IMCRI) is proposed to investigate the effect of diffuse reflections on sound propagation in urban street canyons. By applying image patches, this model calculates both specular reflected components and diffuse reflected components in every reflection. The accuracy of this model is then validated with full-scale measured data from five actual streets with different scattering conditions. Good agreements of sound pressure level and reverberation time are found between the IMCRI and the measurements. The performance of the IMCRI is found to be superior to those of the existing energy models, especially for the reverberation time simulation.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9142803