In this paper, numerous examples will be illustrated as the principles of applying the sound intensity measurements to practical problems at the noise abatement on ships. The paper presents the results of transmission loss measurements together with flanking transmission for ship bulkheads and partitions with doors and windows. The results of tests of transmission loss characteristics will also be presented and investigations carried out with sound intensity techniques will be compared against those made by classical methods. Finally, the graphic presentation of spatial distribution of sound intensity vectors risen close to vibrating ship cabin partitions will be shown. Basing on the near field acoustic intensity measurements, the spatial intensity vectors are measured in a plane close to the ship partitions. As a result, a two-dimensional flow map of time-averaged active intensity vectors propagated along curved streamlines and a vector perpendicular to measured plane is graphically illustrated. The measurement technique described, as well as the method of graphical presentation of results, can enrich the knowledge of the mechanism of acoustic energy flux through ship partitions.
The new research technics of marine noise control
Die neue Forschungstechnik der Schiffsgeräuschsteuerung
NAV & HSMV International Conference, 1997 ; NAV ; 9-40
1997
10 Seiten, 5 Bilder, 9 Quellen
Conference paper
English
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