Theory of Steady-State Urban Noise for an Ideal Homogeneous City

Shaw, E. A. G.; Olson, N.

doi:10.1121/1.1913032

Cited by 24 publications

(8 citation statements)

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“…This study established 345 temporary noise monitoring stations in the Tainan metropolitan area to investigate noise levels during the morning (08:00 $ 10:00), afternoon (14:00 $ 16:00) and evening (20:00 $ 22:00) in summer and winter. To select the locations of measuring points, the Tainan metropolitan area was divided into standard grids with size of 500 m Â 500 m [12]. One temporary measuring booth was setup within each grid.…”

Section: Control Zonesmentioning

confidence: 99%

Noise mapping in urban environments: A Taiwan study

2009

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Section: Control Zonesmentioning

confidence: 99%

Noise mapping in urban environments: A Taiwan study

2009

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“…Some investigators have attempted to develop urban noise models in which propagation mechanisms are virtually ignored. Shaw and Olson [58] treated noise sources within an urban area as a group of point sources distributed uniformly inside a circular region. The number of cells where the noise source has a uniform probability to be located everywhere inside the unit cell is given by the total area of the circle divided by the number of sources.…”

Section: Area Noise Modelsmentioning

confidence: 99%

Computer Modelling of Urban Noise Propagation

Ismail

Oldham

2003

Building Acoustics

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The nature of noise propagation through the urban fabric is not well understood and this reflects the difficulty in obtaining good quality data. The most promising approach to developing urban noise prediction models is computer simulation. Reflections from building facades are a mixture of specular and diffuse. However, as the order of reflection increases the relative fraction of energy reflected purely specularly will decrease and the reflection characteristics will resemble those of the pure diffuse case. It is proposed that an appropriate approach to the development of propagation models could be based upon specular reflections for the lower orders of reflections and diffuse reflections for higher orders of reflection. An alternative statement of the above is that the specular approach would be most appropriate for modelling near field propagation whilst the diffuse approach might be more appropriate for modelling mid and far field propagation. Two approaches to the development of diffuse prediction models have been identified. The radiosity method would allow the investigation of the effect of the disposition of individual buildings on noise propagation but would be computationally demanding if applied to large scale studies. Conversely, an approach based upon the classical diffusion equation is potentially capable of being applied to large scale studies but will not yield any local detail. It is suggested that both approaches might be suitable for incorporating into a comprehensive model for far field urban noise propagation.

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“…Wiener et al analyzed propagation at distances of 300-1200 m, 6 Shaw and Olson analyzed noise propagation up to 5000 m, 7 and Makarewicz and Krasnowska limited the scope to 300 m. 27 All other papers concerned with the same topic limited the scope between 50 and 100 m.…”

mentioning

confidence: 98%

“…The results are based on measurements in real streets and parts of settlements, 6,9,14,21 on analytical and geometrical modeling 7,8,11,12,15,16,[18][19][20][21][24][25][26][27] and on the measurement in physical models. 13,17,22 In some papers, the predicted values of reverberation time in urban areas were also presented.…”

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confidence: 99%

Measurement of reverberation gain in an urban environment

Mijic

Pavlovic

2012

The Journal of the Acoustical Society of America

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Multipath propagation within an urban area introduces a specific type of reverberation in response to sound excitation. That appearance affects the level of ambient noise produced by strong sound sources. In this paper, the signals recorded during the 1999 bombing of Belgrade were used to analyze the characteristics of reverberation in that urban environment. Six recorded signals were selected among more than 50 explosions recorded at that time. Due to the impulse nature of sound sources, the recorded signals represent the impulse responses of that area. The measured reverberation time T30 is about 7 ± 1 s in octaves between 31.5 Hz and 1 kHz. There is a variation of decay slope in time that is verified by differences between values of T10 and T30. The reverberation gain calculated from recorded signals is 2-7 dB, depending on the global position of the sound excitation point as well as its micro-location according to its position among the surrounding buildings. A variation of gain over octave bands is in the interval of approximately 3 dB. Information about reverberation gain in urban environment can be useful in a quick estimation of noise level produced by strong sound sources in a large area of urban environment.

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Theory of Steady-State Urban Noise for an Ideal Homogeneous City

Cited by 24 publications

References 0 publications

Noise mapping in urban environments: A Taiwan study

Noise mapping in urban environments: A Taiwan study

Computer Modelling of Urban Noise Propagation

Measurement of reverberation gain in an urban environment

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