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Investigation Into the Importance of the Degrees of Freedom for the Characterisation of Structure-Borne Sound Sources

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Structure-borne sound sources are ideally characterised by taking into account six degrees of freedom: three translational components and three rotational components. The complexity of such a characterisation is immense and the effort to measure all components is not realistic or even impossible. If a practical characterisation of structure-borne sound sources in building acoustics is aimed for, reliable information about the importance of the different components is essential.

In search for possible simplifications of the degrees of freedom, a series of measurements was carried out on a scale model of an excentric motor connected to a plate on a small receiving room of one cubic metre. The sound pressure in the receiving room was used to verify whether a prediction based on the measured normal source components leads to a correct result. The deviations between the direct pressure measurement and the calculation give some guidance to whether the simplification can be justified or not for the particular structure-borne sound source under test. Once the relevant degrees of freedom have been determined, a simplified prediction based on separately measured source and receiver characteristics can be carried out. The measurement procedure is meant as a method to verify potential simplifications for the characterisation of structure-borne sound sources. It also quantifies in advance the accuracy of a prediction based on those simplifications.
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Document Type: Research Article

Publication date: September 1, 2010

More about this publication?
  • 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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