Abstract
The direct-finite-element method (DFEM) is an algorithm for calculation and measurement of airborne sound power radiated by structure-borne sources. Using a structure-borne source parameter directly means redundant intermediate sound field information such as sound pressure and sound intensity are not necessary. Previous investigation showed that for plane structure-borne sound sources, the DFEM can be derived from the Rayleigh description of sound radiation exactly. This paper deals with the extension of the DFEM for three-dimensional structure-borne sound sources. For these sound sources the DFEM algorithm as already used for plane structure-borne sound sources must be supplemented by a net of imaginary counter sources in order to meet the boundary condition of the arbitrarily shaped vibrating body. This supplement is described and discussed using some examples. Finally, measurement results are presented which are in good conformity with the theoretical results of the modified DFEM.
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