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

Kang, Jian

doi:10.1006/jsvi.2002.5150

Cited by 85 publications

(76 citation statements)

References 25 publications

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“…In particular, the degree of absorption and diffusivity may have an important effect. In a numerical study simulating sound propagation along a narrow street, Kang [109] showed that the extra attenuation provided by placing absorbers on façades increases with greater source-receiver distance along the street.…”

Section: Building Envelope Greeningmentioning

confidence: 99%

Using natural means to reduce surface transport noise during propagation outdoors

et al. 2015

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a b s t r a c tThis paper reviews ways of reducing surface transport noise by natural means. The noise abatement solutions of interest can be easily (visually) incorporated in the landscape or help with greening the (sub)urban environment. They include vegetated surfaces (applied to faces or tops of noise walls and on buildings' façades and roofs), caged piles of stones (gabions), vegetation belts (tree belts, shrub zones and hedges), earth berms and various ways of exploiting ground-surface-related effects. The ideas presented in this overview have been tested in the laboratory and/or numerically evaluated in order to assess or enhance the noise abatement they could provide. Some in-situ experiments are discussed as well. When well designed, such natural devices have the potential to abate surface transport noise, possibly by complementing and sometimes improving common (non-natural) noise reducing devices or measures. Their applicability strongly depends on the available space reserved for the noise abatement and the receiver position.

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Section: Building Envelope Greeningmentioning

confidence: 99%

Using natural means to reduce surface transport noise during propagation outdoors

et al. 2015

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“…Later, the Boundary Element Method was used by Hothersall et al [7]. Based on the assumption of diffuse reflections, the diffusion equation [8] and a radiosity based model were presented [9]. For narrow street canyons, Iu and Li showed that a coherent image sources model is necessary rather than an energy based model [10].…”

Section: Introductionmentioning

confidence: 99%

A Scale Model Study of Parallel Urban Canyons

Hornikx

Forssén²

2008

Acta Acustica united with Acustica

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Shielded urban areas are of importance regarding urban citizens' annoyance and adverse health effects related to road traffic noise. This work extends the existing knowledge of sound propagation to such areas by a scale model study, rather than by model calculations. The scale model study was executed for two parallel urban canyons at a 1 to 40 scale, with a point source located in one canyon. Cases with acoustically hard façades and absorption and diffusion façade treatments were investigated. To correct for excess air attenuation of the measurements, a waveletbased method has been applied. The measurement results in the shielded canyon show that, in contrast to the directly exposed street canyon, the levels and the decay times are quite constant over the length of the canyon. The energy-time curve in the shielded canyon is characterized by a rise time, which can be related to the sound pressure level. The rise times and decays can be explained by separate reflection, diffraction and diffusion processes. A closed courtyard situation enlarges the level difference between acoustically hard façades and applied façade absorption or diffusion treatments at both the directly exposed and shielded side. A comparison between measurements with two different diffusion mechanisms, horizontal and vertical diffusion, reveals that vertical diffusion yields lower levels at the shielded side compared to horizontal diffusion for the investigated situations.

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“…It has been revealed that conventional acoustic parameters for noise measurement [2,3], e.g. weighted sound pressure levels (SPLs), alone are not adequate for the measurement of soundscape [4]; more parameters are needed, which are more likely to be correlated with peopleÕs subjective evaluation of soundscape [5][6][7], such as comfort [4], pleasantness [8], annoyance [9], etc.…”

Section: Introductionmentioning

confidence: 99%