Recent equivalent source methods for quantifying airborne and structureborne sound transfer

J.W. Verheij

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Abstract

Characteristically noise reduction in technical products like road vehicles, ships, aircraft and machines is complicated by the multitude of primary sources and transfer paths. Examples of well-known approaches for transfer path investigations are selective shielding, mechanical uncoupling, "reduced" impedance methods and simple substitution methods (e.g. loudspeakers). This paper presents a brief survey of some recently developed substitution methods which are somewhat more advanced. A characteristic feature of these methods is that the excitation of an individual transfer path is modeled on the basis of in-situ measured source or path responses. Transfer functions to receiver points are measured by invoking the reciprocity principle. For airbome sound transfer two methods are described that model a radiating surface with the aid of a distribution of point monopole sources. A "deterministic" variant uses the volume acceleration distribution and a "Statistical" variant the radiated power distribution. For structure-bome sound transfer two methods are discussed which reproduce approximately the in-situ measured vibrational response on a transfer path. One method uses linear responses (i.e. accelerations) to characterise the vibration field. The other method uses structural intensities. Some experimental results are shown as examples.
Original languageEnglish
Pages (from-to)3-14
JournalNAG-Journaal
Issue number114
Publication statusPublished - 1992

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