Sound propagation over impedance discontinuities with the parabolic approximation

Robertson, J. S.; Schlatter, Philipp; Siegmann, William L.

doi:10.1121/1.414653

Cited by 12 publications

(3 citation statements)

References 10 publications

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“…The models developed to predict such sound propagation fall into two major categories: numerical and semi-analytical. A numerical method based on a boundary-integral equation formulation [86] for calculating the sound propagation over single or multiple impedance discontinuities has been found to give very good agreement with data also. Semi-empirical methods need less computational resources.…”

Section: Impedance Discontinuitiessupporting

confidence: 49%

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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Section: Impedance Discontinuitiessupporting

confidence: 49%

Using natural means to reduce surface transport noise during propagation outdoors

et al. 2015

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“…The models developed to predict such sound propagation fall into two major categories: numerical and semianalytical. Robertson et al [16] study sound propagation over a mixed impedance ground surface using semianalytical parabolic equation approximations and found good agreement with data. A computationally intensive numerical method based on a boundary integral equation formulation [17] for calculating the sound propagation over a single or multiple impedance discontinuities is found to give very good agreement with data also.…”

Section: Single Discontinuitymentioning

confidence: 61%

Exploiting ground effects for surface transport noise abatement

2016

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Growing demand on transportation, road and railway networks has increased the risk of annoyance from these sources and the need to optimise noise mitigation. The potential traffic noise reduction arising from use of acoustically-soft surfaces and artificial roughness (0.3 m high or less) is explored through laboratory experiments, outdoor measurements at short and medium ranges and predictions. Although the applicability of ground treatments depends on the space usable for the noise abatement and the receiver position, replacing acousticallyhard ground by acoustically-soft ground without or with crops and introducing artificial roughness configurations could achieve noise reduction along surface transport corridors without breaking line of sight between source and receiver, thereby proving useful alternatives to noise barriers. A particularly successful roughness design has the form of a square lattice which is found to offer a similar insertion loss to regularly-spaced parallel wall arrays of the same height but twice the width. The lattice design has less dependence on azimuthal source-receiver angle than parallel wall configurations.

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“…Experimental works carried out in the Laboratoire Central des Ponts et Chaussées ͑LCPC͒ showed that the equivalent sound source height is very low ͑of the order of a few centimeters, typically 3 cm͒ and that this source can be correctly modeled by a monopole. 1 In recent past years, propagation of sound above a plane and heterogeneous ground in a homogeneous [2][3][4][5][6][7][8][9] or stratified 10 atmosphere has been extensively studied. In addition, other studies more specifically dealing with the introduction of an obstacle along the sound wave path in a homogeneous [11][12][13][14][15][16][17][18] or stratified [19][20][21][22][23][24][25][26][27][28] or turbulent 29,30 atmosphere have been carried out.…”

Section: Introductionmentioning

confidence: 99%

Traffic noise prediction with the parabolic equation method: Validation of a split-step Padé approach in complex environments

Gauvreau

Bérengier

Blanc‐Benon

et al. 2002

The Journal of the Acoustical Society of America

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This study deals with sound propagation in typical traffic noise conditions. The numerical results are obtained through the split-step Padé method and the discrete random Fourier modes technique. These are first evaluated qualitatively, by color contour maps showing noise propagation, diffraction by an impedance discontinuity or a screen edge, and scattering by atmospheric turbulence. Next, our numerical results are quantitatively validated by comparison with analytical models and other parabolic equation models. For all the atmospheric conditions and geometrical configurations available in literature, the agreement between the different methods is very good, except for some cases involving the atmospheric turbulence. However, in those particular cases, the split-step Padé results are shown to be more consistent with physical theory. Finally, our method seems to be very powerful and reliable for traffic noise prediction.

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Sound propagation over impedance discontinuities with the parabolic approximation

Cited by 12 publications

References 10 publications

Using natural means to reduce surface transport noise during propagation outdoors

Using natural means to reduce surface transport noise during propagation outdoors

Exploiting ground effects for surface transport noise abatement

Traffic noise prediction with the parabolic equation method: Validation of a split-step Padé approach in complex environments

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