Jagged Edge Noise Barriers

Menounou, Penelope; Busch‐Vishniac, Ilene J.

doi:10.1260/1351010001501598

Cited by 6 publications

(6 citation statements)

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“…10͑d͒ shows that the directivity of the diffracted field around the second configuration of the jagged edge barrier follows the directivity of the straight edge barrier in zones B and C, but deviates considerably from it in zones A and D. This can be explained by the fact that the point of first contact lies on the horizontal segment for receivers in zones B and C, but at the junction of two inclined segments for receivers in zones A and D. As a result, receivers in the latter zones are more affected by the presence of the inclined segments in the edge profile. It should be noted, that the observation reenforces conclusions of a previous study on jagged edge barriers, 18 where it has been discovered that the part of the jagged edge close to the point of first contact plays a crucial role. This had been experimentally verified in the shadow zone behind the barrier.…”

Section: B Effects On the Directivity Of The Diffracted Field: Deviasupporting

confidence: 87%

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Experimental study of the diffracted sound field around jagged edge noise barriers

Menounou

You

2004

The Journal of the Acoustical Society of America

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Noise barriers are commonly used to protect communities from transportation noise. In the present study, three types of barriers, modeled as half planes, have been tested in the laboratory: a conventional rigid barrier with a straight top edge, a straight top edge barrier covered with sound absorbing material, and a rigid barrier with a jagged top edge. Measurements were taken not just behind the barriers, but around them on a plane perpendicular to their top edge. Measured signals were compared against theoretical predictions contributing to further validation of a theoretical model. The sound absorbing material was found to affect the diffracted field more in the front of the barrier than behind it. The diffracted field in front of a jagged edge barrier, similar to the field behind it, was found to depend on the geometry of the edge in the area where the shortest diffraction path intersects the edge profile. Last, the performance of the three barriers was compared with one another in all areas around the barrier. It was found that the jagged edge barrier provides shielding similar to the sound absorbing barrier but at a fraction of the cost.

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Section: B Effects On the Directivity Of The Diffracted Field: Deviasupporting

confidence: 87%

“…Our motivation came from work on jagged edge noise barriers 18,19 and on its possible use as parallel noise barriers built along opposite sides of the road. Jagged edge barriers are a new design of barriers that have been shown to improve the shielding effect compared to a straight edge barrier having the same average height.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the diffracted sound field around jagged edge noise barriers

Menounou

You

2004

The Journal of the Acoustical Society of America

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“…Therefore, a perforated thin box using the concept of Helmholtz resonance is installed on a plenum window in the present study in order to enhance the performance of the plenum window at 1000 Hz. In addition, some other previous studies also claimed that noise barrier with jagged edge had greater noise attenuation ability than straight edge [14][15][16][17]. Therefore, in the present study, since sound diffraction might be occurred over the gap or edge of the plenum window's glass pane, jagged flaps with different angles were installed on the edge of the glass pane in order to reduce the energy of the diffracted sound.…”

Section: Introductionmentioning

confidence: 89%

Solving Noise Pollution Issue Using Plenum Window with Perforated Thin Box

et al. 2020

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In the present study, a conventional plenum window was incorporated with perforated thin box in order to enhance its performance at frequency range which centralized at 1000 Hz as most of the common noise sources at city nowadays are centralizing around this frequency. The entire studies were conducted in a reverberation room. The effectiveness of jagged flap on mitigating diffracted sound was also studied. Three types of noises were examined in the current study—white noise, traffic noise and construction noises. The experimental results showed that the plenum window with perforated thin box could reduce 8.4 dBA, 8.7 dBA and 6.9 dBA of white, traffic and construction noises, respectively. The jagged flaps did not have significant effect on the plenum window’s noise mitigation performance. When frequencies were ranging from 800 Hz to 1250 Hz, when compared with the case of without perforated thin box, it was found that the perforated thin box had good acoustic performance where it was able to reduce additional 1.6 dBA, 1.6 dBA and 1.2 dBA of white, construction and traffic noises, respectively.

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“…Random edged barriers (Figure 9) have been investigated in an attempt to interrupt the deterministic phase variations which occur in the case of straight edged barriers 108,109,110 .…”

Section: Random-edged Barriersmentioning

confidence: 99%

A Review of Research on Environmental Noise Barriers

Ekici

Bougdah

2003

Building Acoustics

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During the past four decades, extensive research has been carried out on different noise barrier shapes using analytical and physical modelling as well as full scale testing. This paper reviews traffic noise barrier research and its findings to date. It provides a catalogue of noise barrier profiles; identifying the relative acoustic benefits of each and the physical principles on which they operate. The likely effects of ground and atmospheric conditions on their absolute acoustic performance are described. The types of barriers which are commonly used in practice and those deserving further attention are highlighted. Based on the findings of previous work, recommendations are made on possible areas of further research.

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Jagged Edge Noise Barriers

Cited by 6 publications

References 20 publications

Experimental study of the diffracted sound field around jagged edge noise barriers

Experimental study of the diffracted sound field around jagged edge noise barriers

Solving Noise Pollution Issue Using Plenum Window with Perforated Thin Box

A Review of Research on Environmental Noise Barriers

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