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The Reduction of Structure-Borne Noise

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This paper is confined to a discussion of structure-borne noise originating from periodic exciting forces; for example, a motor vibrating in a vertical direction will excite its supporting structural girders. Such a finite impedance foundation possesses almost undamped natural modes which will respond in resonance, even to low energy excitation. The use of a two-stage compound mounting system to attenuate such structural exciting forces is described.

The response ratio of a finite impedance foundation is defined as the ratio of the displacement produced by a resiliency mounted, to that by a rigidly mounted vibrating load. Structure-borne noise w i l l be a function of this ratio. Although high damping is always a beneficial property of an isolating material, the rapid dynamic modulus rise with frequency associated with high damping synthetic rubbers is most undesirable. It is responsible for the majority of the isolation loss found for such materials at high frequencies.
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Document Type: Research Article

Publication date: 01 January 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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