Comparison of a Ray Model and a Fourier-Boundary Element Method for Traffic Noise Situations with Multiple Diffractions and Reflections
Abstract:A computational study is presented of sound propagation in traffic noise situations, with a non-refracting atmosphere. A ray model and a Fourier - Boundary Element Method (Fourier-BEM) are used. Fourier-BEM yields the three-dimensional sound pressure field of a monopole source in a system with translational invariance in one direction. Fourier-BEM is based on Fourier synthesis of two-dimensional BEM solutions, for both real and imaginary frequencies. Computational details of the method are described. The ray model is based on an analytic, high-frequency solution for wedge diffraction of spherical sound waves. A heuristic solution for multiple wedge diffraction is used. By comparison of ray model solutions and Fourier-BEM solutions, the accuracy of the ray model is investigated for various situations with one or two reflecting noise screens. In these situations, multiple diffractions and reflections occur. In some situations there is very good agreement between the ray model and Fourier-BEM, in other situations there are considerable deviations.
Document Type: Research Article
Publication date: 1997-01-01
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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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