Noise barriers with reactive surfaces

“…A numerical study of the insertion loss (IL) of some rectangular, T-shaped and cylindrical edged noise barriers with rigid, absorbing and soft surfaces has been carried out by Fujiwara et al [4]. In their study, they found that the most efficient design was a T-shape with a soft upper surface.…”

mentioning

confidence: 99%

Performance of profiled single noise barriers covered with quadratic residue diffusers

Monazzam

Lam

2005

Applied Acoustics

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“…Figure 9 indicates that ÁL edge ð S ; R ; f Þ for 500 Hz decreases with decreasing R , but conversely, it increases at 315 Hz. Figure 10 indicates that ÁL edge ð S ; R ; f Þ depends strongly on frequency because of the resonance inside channels [10]. A significantly large sound reduction is obtained from 400 to 630 Hz, where the channels are designed to minimize sound pressure around their open ends.…”

Section: Results Of Efficiency Determinationmentioning

confidence: 99%

“…The figure shows cross-sectional profiles; noise sources are assumed to be located on the left-hand side and receivers are on the opposite side. Four profiles are to be investigated: devices with an absorbing top or channels parallel to the barrier edge [10]. Hereafter, these four …”

Section: Edge Devicesmentioning

confidence: 99%

Simple prediction method for sound propagation behind edge-modified barriers

Okubo

Yamamoto

2007

Acoust. Sci. & Tech.

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In this paper, we describe a method for predicting sound propagation behind barriers with an acoustical device mounted on their top edge to reduce the diffracted sound. The sound-reduction efficiency of the edge-modified noise barrier was investigated previously with a sound source and a receiver located along a circular arc around the barrier top. It was reported that the efficiency is determined as a function of the angles of the source and the receiver, and that it is independent of their radii. On the basis of this finding, a procedure of predicting the diffracted sound field behind an edgemodified noise barrier is proposed in this paper. The prediction of sound propagation is simply modeled by the sum of multiple paths, which idealize interference due to ground reflection, and the angle-dependent efficiency of the edge device is applied to each path. The efficiencies of absorptive and pressure-release devices are determined by scale-model experiments, and the results are substituted into the prediction model. In comparison with the two-dimensional boundary element analyses, it is shown that the proposed procedure predicts the diffracted sound field precisely, including both the interference by ground reflection and the effect of the edge device.

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“…The experimental results of the performance of barriers having different shapes and surface conditions under well controlled environment showed that a soft 3 m high T-shaped barrier provided the same performance as a 10 m high plain barrier (Ishizuka, 2004). Fujiwara et al (1998) described the results of BEM modelling of a T-shaped barrier with a soft upper surface. A uniform level of wells in the upper surface of a T-shaped barriers produce insertion loss values equal to those of a soft surface over a significant range of frequencies.…”

Section: Introductionmentioning

confidence: 97%

Fuzzy TOPSIS Approach in Selection of Optimal Noise Barrier for Traffic Noise Abatement

Garg¹,

Vishesh²,

Maji³

2015

Archives of Acoustics

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The paper presents a retrospective study for selection of noise barrier for road traffic noise abatement. The work proposes the application of Fuzzy TOPSIS (Technique for order preference by similarity to an ideal solution) approach is selection of optimal road traffic noise barrier. The present work utilizes the fuzzy TOPSIS model proposed by Mahdavi et al. (2008) in determination of ranking order of various types of noise barriers with respect to the various criteria considered. It is suggested that application of this approach can be very helpful in selection and application of optimal noise barrier for road traffic noise abatement.

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Noise barriers with reactive surfaces

Cited by 80 publications

References 8 publications

Performance of profiled single noise barriers covered with quadratic residue diffusers

Performance of profiled single noise barriers covered with quadratic residue diffusers

Simple prediction method for sound propagation behind edge-modified barriers

Fuzzy TOPSIS Approach in Selection of Optimal Noise Barrier for Traffic Noise Abatement

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