Decay of sound levels with distance from a steady source observed in a built-up area

Yeow, K.W.

doi:10.1016/0022-460x(77)90399-6

Cited by 9 publications

(3 citation statements)

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“…Several studies have also involved site and scale model measurements to examine sound propagation characteristics in urban spaces [16][17][18][19][20][21]. Ismail and Oldham [22] investigated the role of sound reflection from building façades with irregular surfaces using physical scale models.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on the acoustic characteristics of outdoor spaces surrounded by multi-residential buildings

Yang¹,

Kang

Kim

2017

Applied Acoustics

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A comfortable sound environment in the outdoor spaces of apartment complexes contributes to the improvement of the overall environmental quality. It is expected that the characteristics of room acoustical parameters and sound pressure level (SPL) attenuation of outdoor spaces surrounded by multi-residential buildings depends on many design factors such as the openness, volume, and building layouts, etc. The aim of this study is to clarify the influential factors determining room acoustical parameters and SPL attenuation in outdoor spaces that are surrounded by buildings with complicated topographical conditions. A series of measurements was carried out for 15 outdoor spaces in 6 apartment complexes with different building layouts. The 15 outdoor spaces were categorized into 4 types of building layouts: linear-shaped, parallelshaped, U-shaped, and square-shaped. The result showed that reverberation time (RT) at 500 Hz and 1000 Hz is relatively long, over 4 sec, with uneven RT distribution showing a non-diffuse field. With increasing source to receiver distance, the RT and early decay time (EDT) increased logarithmically. On the other hand, the Definition (D 50) and rapid speech transmission index (RASTI) decreased with increasing source to receiver distances. The result for the SPL attenuation measured at a 20 m source to receiver distance in 10 outdoor spaces showed a 17.7 dB difference between the 10 spaces due to the influence of building geometry. An empirical method considering the openness, size-related parameters, and room constant is also suggested to predict the approximate RT and SPL attenuation in the outdoor spaces.

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Section: Introductionmentioning

confidence: 99%

An experimental study on the acoustic characteristics of outdoor spaces surrounded by multi-residential buildings

Yang¹,

Kang

Kim

2017

Applied Acoustics

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“…In the past few decades, several site measurements of sound propagation in urban spaces have been conducted to evaluate the effect of buildings on the RT and noise levels, especially for road traffic noise [5][6][7][8][9][10][11] . To overcome the limitation of full scale measurements, scale models have also been used to validate sound propagation in urban spaces [12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Acoustic characteristics of outdoor spaces in an apartment complex

Yang¹,

Kim²,

Kang³

2013

noise cont engng j

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Many apartment complexes in Korea feature underground car parks releasing more of the landscape for residents' leisure, rest, or conversation. The acoustic characteristics of these outdoor spaces can therefore make a significant contribution to the overall quality of the environment. This experimental study investigated the acoustic characteristics of outdoor spaces surrounded by multi-storey apartment buildings. In-situ measurements in three positions were carried out to evaluate the acoustic parameters, including reverberation time (RT), early decay time (EDT), rapid speech transmission index (RASTI) and sound pressure level (SPL) distribution. The results show that RT was generally rather long, over 4 sec at 500 Hz. On the other hand, RT at 125 Hz and 250 Hz was relatively short, about 0 to 3 sec. Above 500 Hz, RT increased with increasing source-receiver distance. EDT was longer than RT over a certain source-receiver distance at about 40 m. In terms of sound distribution, measured SPL was up to 8 dB higher compared to the semi-free field situation, indicating the effects of multiple reflections. © 2012 Institute of Noise Control Engineering.

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“…Another key problem is model validation, especially in actual street canyons. Due to the complexity of real urban areas, only a few measurements have been implemented [27][28][29][30]. Furthermore, it is difficult to use the measured data directly for model validation because of the lack of accurate parameters of surfaces, especially scattering coefficients.…”

Section: Introductionmentioning

confidence: 99%

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

Kang

2019

Applied Sciences

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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.

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Decay of sound levels with distance from a steady source observed in a built-up area

Cited by 9 publications

References 1 publication

An experimental study on the acoustic characteristics of outdoor spaces surrounded by multi-residential buildings

An experimental study on the acoustic characteristics of outdoor spaces surrounded by multi-residential buildings

Acoustic characteristics of outdoor spaces in an apartment complex

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

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