Sound Radiation From Railway Tunnel Openings
Abstract:Sound radiation from railway tunnel openings was investigated by field and by scale model measurements. In addition to the measurements a theoretical approach was examined. Based on an analytical solution for sound fields in ducts a calculation scheme was developed to estimate sound pressure and velocity in the tunnel opening. The subsequent evaluation of the Kirchhoff-Helmholtz Integral leads to a directivity pattern of the emitted sound. Based on this knowledge an algorithm was derived to calculate at an arbitrary receiver point the sound immission emanating from a train while it is in a tunnel. The results of the algorithm agree well with findings from the scale model experiments. The scale model experiments show that the installation of sound absorbing material along the circumference of the tunnel over a length of at least 30 m reduces the contribution from the tunnel to negligible values.
Document Type: Research Article
Publication date: 2006-07-01
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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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