IngentaConnect A Practical Characterisation for Vibro-Acoustic Sources in Buildi...

Authors: Gibbs, B.M.; Qi, N.; Moorhouse, A.T.

Source: Acta Acustica united with Acustica, Volume 93, Number 1, January/February 2007 , pp. 84-93(10)

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.

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A Practical Characterisation for Vibro-Acoustic Sources in Buildings