A practical characterisation for vibro-acoustic sources in buildings



Gibbs, BM ORCID: 0000-0002-5146-8215, Qi, N and Moorhouse, AT
(2007) A practical characterisation for vibro-acoustic sources in buildings. ACTA ACUSTICA UNITED WITH ACUSTICA, 93 (1). pp. 84-93.

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Abstract

This paper considers a practical structure-borne sound source characterisation for mechanical installations in buildings. Such machines nearly always are installed in contact with heavyweight homogeneous structural floors and walls, or floating floor systems, or stiffened cavity constructions. Manufacturers require a laboratory-based measurement procedure, which will yield single values of source strength in a form transferable to a prediction of the sound power generated in the installed condition, and thence the sound pressure in rooms removed from the source. A novel reception plate method is proposed which yields the source activity in the form of the sum of the squared free velocities, over the contact points. In addition, the source mobility is obtained separately as the average of the magnitude of the effective mobility, over the contact points. Both quantities can be used to estimate the installed power for the range of receiver mobilities likely to be encountered in buildings. It is demonstrated that the installed power can be estimated by reference to a high source mobility condition, a low source mobility condition, or to a matched mobility condition. © S. Hirzel Verlag EAA.

Item Type: Article
Additional Information: The paper reports on work produced in collaboration with research groups in Stuttgart, Eindoven and Grenoble. A novel laboratory method is proposed, for measuring the vibrational power of a machine, which produces data which can be used to predict the resultant sound generated by the machine when installed in buildings. The collaborators are members of a European standards working group (CEN/TC 126/WG 7), concerned with noise control in the built environment, and are actively considering the proposal as a future standard test method. ## TULIP Type: Articles/Papers (Journal) ##
Uncontrolled Keywords: Structure-borne sound, sources, building acoustics
Depositing User: Symplectic Admin
Date Deposited: 07 Nov 2017 14:23
Last Modified: 19 Jan 2023 06:50
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3011701