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Absorption of Hydrodynamical Sound Waves by Forced Alternating Flow of Fluids

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The present paper introduces thin-layered absorbers of water-borne sound for frequencies above 250 Hz, in which the losses necessary for absorption are obtained by forced alternating flow of viscous fluids with which there is a transformation of particle velocity. Using streaming fluids of a viscosity of some 103 cP, fluid damped single and coupled resonant systems yield good absorption in a frequency range of up to three octaves. When fluids of smaller viscosity are used, difficulties arise in the adjustment of the necessarily smaller thickness of layer and thus in matching the absorber. Non-Newtonian properties prevent broad-band matching with fluids of viscosities considerably larger than 103 cP.

In the frequency range of 250 Hz to 4 kHz the impedance measurements are carried out in a pressure chamber, while a pulse-tube is used between 4 kHz and 21 kHz.
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Document Type: Research Article

Publication date: January 1, 1967

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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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