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

1,*, 2 and 2,3
1
School of architecture and Arts, Beijing Jiaotong University, No.3 Shangyuancun, Haidian District, Beijing 100044, China
2
School of Architecture, Tianjin University, Weijin road 92, Tianjin 300072, China
3
UCL Institute for Environmental Design and Engineering, The Bartlett, University College London (UCL), London WC1H 0NN, UK
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(14), 2803; https://doi.org/10.3390/app9142803
Received: 24 May 2019 / Revised: 2 July 2019 / Accepted: 11 July 2019 / Published: 12 July 2019
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Abstract

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. View Full-Text
Keywords: scattering reflection; street canyon; hybrid model; full-scale measurement scattering reflection; street canyon; hybrid model; full-scale measurement
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Yu, B.; Ma, H.; Kang, J. A Hybrid Model for Investigating the Effect of Scattering from Building Façade on Sound Propagation in Street Canyons. Appl. Sci. 2019, 9, 2803.

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