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Investigation Into the Importance of the Degrees of Freedom for the Characterisation of Structure-Borne Sound Sources: Case Study of a Washing Machine on a Wooden Floor

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The characterisation of structure-borne sound sources is essential for the prediction of sound pressure levels in buildings. In case of a linear relationship between force and velocity, a source connected through multiple points to a receiver structure can be precisely analysed using the mobility approach. This requires the measurement of six degrees of freedom at every contact point and involves time-consuming and difficult measurements of rotational components. This paper concentrates on determining the error that is made if the six degrees of freedom are approximated by using only normal components. A case study with a washing machine on three feet positioned on a wooden floor is carried out. The measurements show that linearity is given and that the influence of non-normal components is rather moderate in practical cases. In the frequency range between 20 and 125 Hz the error is negligible. Between 125 Hz and 1 kHz the error is −2 ± 2 dB. Results for several feet with different contact area and stiffness are discussed.
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Document Type: Research Article

Publication date: 2011-11-01

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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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