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Werkstoffe mit extrem hoher innerer Dämpfung

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Materials of high inner damping are useful for diminishing the propagation of disturbing noise via solid structures. They may be used as building materials, as damping layers on metallic structures, as spring elements for vibration isolation or structure-borne sound insulation, etc.

Extremely high internal losses can be obtained with high polymers (rubber and plastics), if use is made of the elastic dispersion which is due to molecular relaxation processes occuring in the visco-elastic range of the materials. The dispersion ranges in which the absorption has a maximum value can be systematically shifted to the desired frequencies and temperatures if the mixtures of which the materials consist are suitably chosen.

Damping materials which are in technical use as adhesive layers on metal sheet structures have been adjusted in this way. The vibration damping of the metal sheets which is obtained with sufficiently thick layers is comparable to the inner damping of soft cork, and it can be shown that it will scarcely be possible to attain an essentially higher damping efficiency.
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Document Type: Research Article

Publication date: January 1, 1956

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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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