Practical Description of Diffraction at Wedges Applied to Propagation Model in a Built-Up Area
Abstract:In a propagation model of the environmental noise model for a built-up area, wave multiple interactions are presented as chains of elementary interactions. The chain can contain sequences of reflections and transmissions and diffraction, which can be of any arbitrary order (higher than one) and can appear at any place in a chain. The procedure developed for diffraction description is the one appropriate to be applied in the propagation model. The diffraction description assumes validation of high frequency approximation and the thick boundary for the region in the vicinity of boundaries of shadows where the sound pressure is assumed to be equal to its value exactly at the boundary. The reflection properties of a diffraction wedge are included into the description of diffraction process. The comparison between results of the exact solution and the experiment has shown better agreement than expected. Enough good agreement is observed up to a source and observation point distances from a wedge of a wavelength order.
Document Type: Research Article
Publication date: January 1, 2002
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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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