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Untersuchungen zur Wechselwirkung zwischen Schallfeld und Strömung im Windkanal, der mit porösen Absorbern und Helmholtzresonatoren ausgekleidet ist

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Sound attenuation in ducts with absorbent coating of the walls is strongly dependent on the direction and velocity of the air flow. The change of attenuation is brought about by a change of the characteristic properties of the absorbing material and by the deformation of the phase surface of the sound field caused by the air flow. Calculated values of the attenuation taking both effects into account are in good agreement with experimental values.

The sound amplification mechanism in a duct coated with undamped Helmholtz resonators is explained in the interaction between the sound field and the turbulence of flow. Conversion of flow energy into sound energy is effected by synchronisation of the turbulence. Under favourable circumstances this synchronisation leads to the formation of a stable pseudo sound wave. Pseudo sound and sound interact at the resonator necks.
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Document Type: Research Article

Publication date: January 1, 1961

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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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