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Die Schallausbreitung in körnigen Substanzen

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In granular substances in the form of rods there appear longitudinal, flexural and torsional waves. The elastic modules and the loss factor are each dependent on the static pressure so that their values vary with the layer thickness. In dry sand and glass spheres in layers 3 to 11 cm thick the longitudinal velocity was found to lie between 100 to 170 m/s. The loss factor lay between 6 and 12 · 10−2. In sharp-edged materials such as brick chips and coal dust the longitudinal velocity was independent of the thickness and amounted to approx. 80 m/s. The velocity could be reduced by the addition of a soft material. In the second part of the work the damping of waves in a solid body due to a layer of sand is reported. There occurs in such combinations a damping maximum at the frequency at which the layer of sand is in resonance. This behaviour is explained theoretically and confirmed by measurements of the sound velocity and damping in an aluminium rod coated with sand.
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Document Type: Research Article

Publication date: January 1, 1954

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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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