Reverberation time in a high-rise city

Ko, Nwm; Tang, Chuanfeng

doi:10.1016/s0022-460x(78)80157-6

Cited by 15 publications

(11 citation statements)

References 5 publications

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“…In a congested city, the street canyon effect results in considerable city reverberation [30]. The acoustical protection of the abovementioned protrusions will be much reduced in the presence of random incident noises.…”

Section: Fins Lintels Screens and Similar Protrusionsmentioning

confidence: 99%

A Review on Natural Ventilation-enabling Façade Noise Control Devices for Congested High-Rise Cities

Tang

2017

Applied Sciences

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Abstract:This review summarizes the current status of the research and development of natural ventilation-enabling noise control devices for use on the façades of high-rise residential buildings in congested cities. These devices are important for a sustainable urbanized city, as they are supposed to offer good acoustical protection to citizens, allowing for an acceptable level of natural ventilation inside residential units; energy for mechanical ventilation can then be saved. From the information presented in the existing literature, it is concluded that protrusive devices, such as lintels and balconies, are not effective noise screening devices, even if they are installed with sound absorbers and/or reflectors, under the effect of city reverberation. On the contrary, plenum windows and similar structures, which are plenum structures with a staggered air inlet and outlet, are interesting alternatives that are worth rigorous considerations.

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Section: Fins Lintels Screens and Similar Protrusionsmentioning

confidence: 99%

A Review on Natural Ventilation-enabling Façade Noise Control Devices for Congested High-Rise Cities

Tang

2017

Applied Sciences

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“…The decay curve can be obtained by the reverse-time integration of LðtÞ: Consequently, reverberation time, which has been demonstrated to be a useful index for streets [23,24], can be determined. In RASCL both the early decay time (EDT) and RT30 are considered.…”

Section: Receivermentioning

confidence: 99%

Numerical Modelling of the Sound Fields in Urban Streets With Diffusely Reflecting Boundaries

Kang¹

2002

Journal of Sound and Vibration

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“…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%

“…Some authors used as a sound source a helicopter 9,10 or a hammer dropped from 3 to 6 m on a sheet steel pile on the ground. 14 The second problem is the relatively high level of ambient noise, which is nowadays permanently present in urban environments. These two problems are interrelated because the dynamic range of the signal in the reverberation analysis is a function of excitation intensity and the floor level of ambient noise.…”

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confidence: 99%

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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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Reverberation time in a high-rise city

Cited by 15 publications

References 5 publications

A Review on Natural Ventilation-enabling Façade Noise Control Devices for Congested High-Rise Cities

A Review on Natural Ventilation-enabling Façade Noise Control Devices for Congested High-Rise Cities

Numerical Modelling of the Sound Fields in Urban Streets With Diffusely Reflecting Boundaries

Measurement of reverberation gain in an urban environment

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