Dynamic Simulation of Traffic Noise by Applying Ray Tracing Method based on Indoor Space Partitioning
This study presents a revised 3 dimensional ray tracing method by combining with indoor space partitioning. This method divides an entire indoor space into limited convex polyhedron subspaces, and thus reduces the number of surfaces intersected with rays, and omits the validity test of the collision point on the reflecting surfaces. Combining with a microscopic traffic simulation tool and a vehicle noise emission model, and taking the influence of diffraction into account, the method can be utilized inulating dynamically the process of traffic noise diffusing inside the building through windows. Meanwhile, this study selects two different types of architectural layouts in order to demonstrate this method's efficiency, the influence of diffraction and of the state of windows, the differences in indoor noise on different floors and the comparison of indoor and outdoor traffic noise distribution. A comparison study on before-and-after indoor space partitioning shows that the method is efficient, with about 60% optimization rate. Further, with windows open, the level difference between average indoor and outdoor traffic noise is 7.5 dB, while it can reach to 12.8 dB with windows closed.
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Document Type: Research Article
Publication date: May 1, 2014
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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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