Prediction of enhancement factor for small explosive sources in a stratified moving atmosphere

Walkden, F.; West, M.

doi:10.1121/1.396988

Cited by 12 publications

(2 citation statements)

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“…Recent work [12][13][14][15][16][17] has been concerned primarily with the effects of wind and turbulence in the atmosphere. It is of great interest to develop a practical ray model that can be used for outdoor noise control.…”

Section: Introductionmentioning

confidence: 99%

Caustic diffraction fields in a downward refracting atmosphere

Salomons¹

1998

The Journal of the Acoustical Society of America

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A fast and accurate ray model is developed for sound propagation in a downward refracting atmosphere. The model employs a new approach to the classification and computation of ray paths and caustic curves. The approach is valid for a large set of smooth sound-speed profiles, including realistic, nonlinear profiles such as the logarithmic profile. An ordered series of rays and caustics is found in this case, including caustics with a cusp. The sound-pressure field is computed by combining geometrical acoustics and the theory of caustics. The field on the illuminated side of a caustic is computed by modifying the geometrical-acoustics solution. The field on the shadow side of a caustic, i.e., the caustic diffraction field, is computed by extrapolation of various quantities into the shadow region. Different approaches to this extrapolation are considered. It is found that horizontal extrapolation gives the best results. The accuracy of the ray model is demonstrated by comparison with numerical solutions of the one-way wave equation. If caustic diffraction fields are ignored, discontinuities of more than 10 dB occur in the sound-pressure field.

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Section: Introductionmentioning

confidence: 99%

Caustic diffraction fields in a downward refracting atmosphere

Salomons¹

1998

The Journal of the Acoustical Society of America

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“…In the past, Thompson's method 6,7 and its derivative 13 were commonly used as the basis for the ray-tracing algorithm in a moving stratified medium. These previous methods are based, in turn, on the theory derived by Blokhintzev.…”

Section: An Improved Scheme For Ray Tracingmentioning

confidence: 99%

An improved ray-tracing algorithm for predicting sound propagation outdoors

Taherzadeh

Attenborough

1998

The Journal of the Acoustical Society of America

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A new ray-tracing method for predicting the sound field near a flat impedance ground in a refracting atmosphere is developed that includes the effect of vector wind and turbulence explicitly. Improvements on previous ray-tracing schemes include the use of a generalized Snell's law, an integration by means of a Gaussian quadrature, and a bracketing method for finding the ray paths. For the turbulence calculations, the interray coherence is determined from turning point heights rather than from integrals along the ray paths. A more efficient algorithm is developed for computing the sound field above an impedance plane in a realistic atmosphere. Despite the inherent limitations of the ray-trace approach, particularly in respect of logarithmic wind profiles, the algorithm is valid over a wide range of practical situations.

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High Frequency Sound Fields

Brekhovskikh

Godin

1992

Springer Series on Wave Phenomena

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Prediction of enhancement factor for small explosive sources in a stratified moving atmosphere

Cited by 12 publications

References 0 publications

Caustic diffraction fields in a downward refracting atmosphere

Caustic diffraction fields in a downward refracting atmosphere

An improved ray-tracing algorithm for predicting sound propagation outdoors

High Frequency Sound Fields

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