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Problems of Impact Testing of Floors

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The result of impact testing of floors depends – in contrast to the air-borne-sound-testing – on the internal impedance of the exciter. Only if the impedance of the floor is much larger we may even infer from air-borne-sound measurements the impact-reaction. But with elastic layer the impact test results depend on the internal impedance and therefore on the choice of the type of excitation. In comparison with footfalls the tapping machine results give too high levels below bare floors. This could be eliminated by making use of hammers with rubber coating as already alternatively recommended in ISO R 140. – Another difficulty results from the nonlinear behaviour of elastic layers. This could be overcome by decreasing the momentum-level by 5 dB. – It has also been proposed to take the special impulse-character of footfalls into account by measuring the levels of masking noise, and to substitute this difficult testing by measuring peak levels. The last method also suggests measuring the peaks of the structure-borne-sound in the ceiling immediately.
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Document Type: Research Article

Publication date: November 1, 1976

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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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