Sound Propagation Over a Barrier with Realistic Wind Gradients. Comparison of Wind Tunnel Experiments with GFPE Computations
In order to study the effect of meteorology on sound diffraction by barriers, the results of scale-model experiments performed in a wind tunnel are compared with Green's Fast Parabolic Equation (GFPE) calculations for downwind refraction. Precise measurements of the airflow and turbulence around the barrier yield data that provide a good test for the GFPE. In the GFPE calculation, the medium is approximated as a series of range independent sections. The agreement between measured and calculated results is quite good. The results also show that barrier effect is not totally cancelled by downwind conditions. In addition, the comparison of experimental results with GFPE calculations with simpler range independent sound speed profiles shows that simple schemes using a constant sound speed gradient is efficient as well. Moreover, a method to implement a von Kármán turbulence spectrum in GFPE is applied and the results are compared to measurements.
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Document Type: Research Article
Publication date: May 1, 1999
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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