Noise reduction by a barrier having a random edge profile

Ho, Steve; Busch‐Vishniac, Ilene J.; Blackstock, David T.

doi:10.1121/1.418508

Cited by 22 publications

(27 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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]. Previous work on jagged-edge noise barriers includes experimental, numerical, and theoretical studies.…”

Section: Introductionmentioning

confidence: 98%

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

Menounou¹,

You²

2004

Noise Control Eng. J.

View full text Add to dashboard Cite

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

show abstract

Section: Introductionmentioning

confidence: 98%

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

Menounou¹,

You²

2004

Noise Control Eng. J.

View full text Add to dashboard Cite

show abstract

“…Pao [1], Banaugh and Goldsmith [2], Pao and Mow [3], Wong [4] and Sanchez-Sesma [5]. However, realistic applications of scattering method in geophysical prospecting [6], noise reduction [7] and medicine [8] involve highly irregular scatterers (e.g. landmines, noise barriers and kidney stones).…”

Section: Introductionmentioning

confidence: 99%

Scattering of plane harmonic P, SV and Rayleigh waves by a completely embedded corrugated elastic inclusion

Dravinski

2010

Wave Motion

View full text Add to dashboard Cite

“…A preliminary study was performed to increase the signal-to-noise ratio. Transient impulse signals have been used in the past as the input for diffraction experiments owing to the convenience with which spurious echoes may be removed [41]. That is, spurious features in the impulse response function can easily be eliminated by simple algebraic operations.…”

Section: Continuous Random Input and Transient Impulse Inputmentioning

confidence: 99%

Study of the Performance of Acoustic Barriers for Indiana Toll Roads

Suh¹,

Mongeau²,

Bolton³

2002

View full text Add to dashboard Cite

Prepared in cooperation with the Indiana Department of Transportation and Federal Highway Administration. AbstractThe purpose of this study was to optimize the geometry and the acoustic properties of sound barriers for traffic noise applications. The approach consisted of developing and validating boundary element predictive models, which were subsequently exercised in order to refine the barrier characteristic and determine optimized configurations.The simple geometry of a circular disk was chosen to validate the boundary element model in the first part of this work. Experiments were performed in an anechoic chamber to validate the numerical model. Complex barrier geometries were then investigated to study the effects of geometry on sound barrier performance. Boundary element models were used to quantify the accuracy of existing, approximate diffraction-based models. Diffraction-based models have been widely applied in noise control engineering applications owing to their relative ease of use. Recent research suggests that multi-path diffraction components should be summed on a phase-coherent basis instead of on an energy basis. The accuracy of a phase-coherent diffraction model has been verified against the boundary element solution and the limitations of the diffraction model are discussed for both the case of infinite length barriers and barriers of finite length. A new barrier performance metric, based on the sound power propagating within the shadow zone was also investigated. It was found that variation of barrier geometry while maintaining the surface area constant did not yield any meaningful difference in the sound power propagating within the shadow zone.The performance of straight-edge barriers with various top geometries and sound absorptive treatments was then investigated. Experiments were performed using a finite size barrier in an anechoic chamber to verify the boundary element model. Good agreement was obtained between the results from the numerical model and the experimental data. The most important finding was that absorptive treatment applied to the top of a barrier was more effective at reducing sound levels in the shadow zone than a simple increase of barrier height. The use of the boundary element method to calculate the new barrier sound power performance metric is also discussed in connection with the complex geometry. It is shown that the propagating sound power calculated on a recovery plane in the barrier shadow zone provides a more effective performance measure than insertion loss when comparing the performance of different barrier designs. 17.

show abstract

Noise reduction by a barrier having a random edge profile

Cited by 22 publications

References 20 publications

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

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

Scattering of plane harmonic P, SV and Rayleigh waves by a completely embedded corrugated elastic inclusion

Study of the Performance of Acoustic Barriers for Indiana Toll Roads

Contact Info

Product

Resources

About