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An Experimental Study of the Vertical Directivity Pattern of Wheel/Rail Rolling Noise

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An experimental approach for studying the vertical directivity pattern of noise radiated from a passing train is presented. Four sets of noise measurements are conducted at three different sites, including ballast tracks at grade and railway on a concrete viaduct. The time histories computed from a horizontal radiation model are compared with the measured noise profiles. The measured sound exposure levels are used to deduce the vertical directivity pattern for different railway systems of continuously welded rail systems. It is found that the vertical directivity of different railway systems shows a rather similar pattern. The vertical directivity of train noise is shown to increase up to about 30° before reducing to a minimum at 90°. A multipole expansion model is proposed to account for the vertical radiation directivity of the train noise. The empirical model is found to be applicable to different train/rail systems at train speeds ranging up to 120 km/h.
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Document Type: Research Article

Publication date: September 1, 2007

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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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