Estimating the Effect of Semi-Transparent Low-Height Road Traffic Noise Barriers with Ultra Weak Variational Formulation

Ding, Lei; Renterghem, Timothy Van; Botteldooren, Dick

doi:10.3813/aaa.918420

Cited by 11 publications

(8 citation statements)

References 18 publications

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“…This shielding effect confirms previous assessments [10], but tilting the low barrier seems even more interesting, additionally reducing 3.4dB(A) for pedestrians and achieving a total reduction of 7.7dB(A) relative to the absence of such a barrier (S1.1). Inclinations of 10˚, 20˚, 30˚…”

Section: Sequence S1: Low Barrier Shapesupporting

confidence: 88%

The effect of street canyon design on traffic noise exposure along roads

Sánchez

Renterghem

Thomas

et al. 2016

Building and Environment

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Abating road traffic noise pollution is one of the main urban environmental challenges nowadays.However, architects and urbanists take decisions on urban regulations that define the shape of streets and buildings without taking this aspect into account. Furthermore, there is little information about the influence of urban geometry on traffic noise exposure in streets. In this study, the effect of street canyon design on sound pressure level distribution is numerically studied in high detail with the full-wave finite-difference time-domain method (FDTD). The CNOSSOS equivalent source power spectra were used to approach road traffic noise sources along two traffic lanes. Receivers both along the façades and the sidewalks have been considered in 42 cases. Numerical results demonstrate that building shape, street geometry and the presence of street furniture can have a strong impact on people's noise exposure. Building shape can be responsible for variations of up to 7.0dB(A) at pedestrians. Building-façade design can reduce the average exposure at windows with 12.9dB(A). It was further predicted that street geometry can enhance the positive effect of low barriers to 11.3dB(A) along sidewalks. It was therefore concluded that carefully designing building façades and street geometry could improve the sound climate for people living and walking along busy urban streets and should be considered in future urban street design.

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Section: Sequence S1: Low Barrier Shapesupporting

confidence: 88%

The effect of street canyon design on traffic noise exposure along roads

Sánchez

Renterghem

Thomas

et al. 2016

Building and Environment

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“…The urban intervention might include noise abatement measures whose corresponding noise reduction needs to be calculated in detail, resulting in a frequency-dependent insertion loss used for filtering the aforementioned B-Format recordings. In this work, the detailed finite difference time domain (FDTD) method was used to numerically predict the effect of different noise barriers (Ding, Van Renterghem, & Botteldooren, 2011). This accurate method is capable of computing all physical phenomena involved like multiple diffractions and scattering.…”

Section: General Methodologymentioning

confidence: 99%

Using Virtual Reality for assessing the role of noise in the audio-visual design of an urban public space

Sánchez

Renterghem

sun

et al. 2017

Landscape and Urban Planning

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ABSTRACT:Sound planning is not often included in the urban design process despite the well-known audio-visual interactions of human perception. A methodology to compare the overall appreciation of future renovation alternatives of urban public spaces using Virtual Reality Technology is proposed. This method is applied to assess the role of noise in the overall appreciation of a walk on a bridge crossing a highway. The auralization is a dynamic 3D surround based on B-format recordings (ambisonics), filtered by means of full-wave numerical calculations obtaining the sound field behind noise barriers along the bridge's edge. Four different styles of visual street design including different noise barrier heights in combination with the 4 corresponding predicted sound fields were evaluated for their pleasantness by 71 normal-hearing participants on 4 separate days. Each day participants experienced all the visual environments with only one soundscape (to elude direct sound comparison) and anything related to sound was not mentioned in the first part of the experiment. Even in this non-focussed context, a statistically significant effect of the sound environment on the overall appreciation was found. In general, the pleasantness increases with traffic noise level reduction, but the visual design has a stronger impact. By mentioning the soundscape while introducing the evaluation, slightly lower (but statistically significantly different) pleasantness ratings were obtained. Instead of increasing noise barrier height, improving the visual design of a lower barrier seems more effective to increase pleasantness.Visual designs including vegetation strongly outperform others. The virtual experience was rated as immersive and realistic.3

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“…One possibility to still use barriers is making them sufficiently low. A number of studies have been carried out investigating the use of low-height noise barriers by means of scale modelling and by numerical approaches [42][43][44][45][46]. Such devices can be effective to abate road traffic noise since the typical source generation positions are located close to the street surface.…”

Section: Urban Road Traffic Noise Barriersmentioning

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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Estimating the Effect of Semi-Transparent Low-Height Road Traffic Noise Barriers with Ultra Weak Variational Formulation

Cited by 11 publications

References 18 publications

The effect of street canyon design on traffic noise exposure along roads

The effect of street canyon design on traffic noise exposure along roads

Using Virtual Reality for assessing the role of noise in the audio-visual design of an urban public space

Using natural means to reduce surface transport noise during propagation outdoors

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