Model studies of barrier performance in the presence of ground surfaces. Part I—Thin, perfectly reflecting barriers

Hutchins, David A.; Jones, H. W.; Russell, L. T.

doi:10.1121/1.390982

Cited by 14 publications

(11 citation statements)

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“…The studies range from semi-empirical models [1][2][3] * , to rigorous [4][5][6][7], to approximate analytical solutions [8][9][10], and numerical methods [11,12] to name a few from the vast literature on the subject. Furthermore, substantial effort has been devoted to improving the shielding effect of a barrier [13][14][15][16][17][18][19][20][21][22][23][24][25]. The work on improving the barrierʼs noise-reduction performance by introducing jaggedness is somewhat limited [26][27][28][29].…”

Section: Introductionmentioning

confidence: 98%

Design of a jagged-edge noise barrier: Numerical and experimental study

Menounou¹,

You²

2004

Noise Control Eng. J.

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The present work is a continuation of the investigation of a novel design for a noise barrier with a jagged top edge instead of the conventional straight top edge. Previous work showed that making the top edge of the barrier jagged can in some, but not all, cases reduce the strength of the diffracted sound field behind the barrier, although the barrier's performance depended on receiver location. The present work describes a profile for a jagged-edge barrier that substantially reduced (by almost 70%) the peak of the diffracted sound-pressure signal behind the barrier compared with the peak sound pressure at the same location behind a straight-edge barrier of the same average height. The noise reduction provided by an optimized design for the jagged-edge barrier did not depend on receiver location. The optimum geometry for the jagged-edge profile was determined from extensive numerical investigations of different design parameters using an analytical model termed the Directive Line Source Model. Subsequently, the performance of the jagged-edge profile was tested in the laboratory using a spark source in air. Good agreement between experimental data and numerical predictions supported the validity of the analytical model. © 2004 Institute of Noise Control Engineering

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Section: Introductionmentioning

confidence: 98%

Design of a jagged-edge noise barrier: Numerical and experimental study

Menounou¹,

You²

2004

Noise Control Eng. J.

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“…The tremendous cost of traffic noise barriers has motivated research to improve their shielding performance without substantially increasing their cost. A vast body of literature exists on ways to improve the barrier performance by modifying its top edge [2][3][4][5][6][7][8][9][10]. (The references given are indicative and the list is by no means exhaustive.)…”

Section: Introductionmentioning

confidence: 99%

Jagged Edge Noise Barriers

Menounou

Busch‐Vishniac

2000

Building Acoustics

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A novel design of traffic noise barriers is presented: barriers that have a jagged instead of the conventional straight top edge. Experimental, numerical, and analytical investigations show that noise barrier performance can be improved by making the top edge jagged. In many, but not all, cases the jagged edge improves insertion loss, by up to 6 dB. The most promising theoretical approach is to model the edge as a directive line source. Besides yielding predictions that agree favourably with measurements, the line source model reveals that the diffracted field behind a jagged edge barrier depends strongly on the receiver location, the portion of the edge on the most direct path between source and receiver, and the inclination of the straight barrier edge segments. Further, because the model is easy to apply, it is a promising and powerful tool for design of optimum edge profiles.

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“…Various scale factors can be employed depending on the nature of the environmental problem to be examined. Some examples are 1:5 66 , 1:10, 1:16 62,67 , 1:20 68,69 , 1:40 45 , 1:50 70,71 , 1:80 65,72 , 1:100 42 . This clearly shows that the practical choices made are based on individual circumstances 73 .…”

Section: Scale Factormentioning

confidence: 99%

“…In order to model the acoustic properties of real surfaces, a wide range of materials have been used. Aluminium 65,69 has been used to simulate reflective surfaces, such as asphalt, due to its high impedance. Plywood 76,66 has been employed as barrier model material.…”

Section: Modelling Materialsmentioning

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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Model studies of barrier performance in the presence of ground surfaces. Part I—Thin, perfectly reflecting barriers

Cited by 14 publications

References 0 publications

Design of a jagged-edge noise barrier: Numerical and experimental study

Design of a jagged-edge noise barrier: Numerical and experimental study

Jagged Edge Noise Barriers

A Review of Research on Environmental Noise Barriers

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