Archives of Acoustics, 42, 2, pp. 207–212, 2017
10.1515/aoa-2017-0023

The Use of Acoustic Vectors Decomposition of Sound Fields to Vibroacoustic Protection on Ships

Stefan WEYNA
West Pomeranian University of Technology
Poland

In this paper, numerous examples will be illustrated as principles of applying the sound intensity measurements to practical problems at the noise abatement on ships and offshore constructions. The paper presents the results of transmission loss measurements together with flanking transmission for ship bulkheads and partitions with doors and windows. Investigations carried out with sound intensity measurement techniques will be compared against those made by classical methods. Finally for a few examples, the graphic presentation of spatial distribution of sound intensity vectors risen close to vibrating ship cabin partitions and inside the cabin will be shown in 2D and 3D graphical form. As a result, a two-dimensional acoustic wave flow map of time-averaged active intensity vectors propagated along curved streamlines and a vector perpendicular to measured plane are graphically illustrated. The technique of acoustic vectors decomposition of sound fields described, can enrich the knowledge of the mechanism of acoustic energy flux through ship partitions.
Keywords: acoustic vectors field; sound intensity; ship acoustics
Full Text: PDF

References

Crocker M., Forssen B., Raju P., Wang Y. (1981), Application of acoustics intensity measurement for the evaluation of transmission loss of structures, Proc. 1st Int. Congres of Acoustic Int. Measurement, Senlis, 1–9.

Fahy F. (1989), Sound Intensity, Elsevier Applied Science, London, New York.

Weyna S. (1988), Measurement of acoustic power radiation by cabin partitions in-situ using intensity method, Proc. Noise Control’88, Kraków, 413–416.

Weyna S. (1993a), Graphical presentation of acoustic energy transmitted through partition with door, Proc. Energetic Methods in Vibroacoustics, Krynica, 129–134.

Weyna S. (1993b), Noise level inside ship accommodation depend on acoustic power radiated by a cabin windows, Proc. Inter-Noise'93, Leuven, 287–292.

Weyna S. (1993c), Radiation efficiency characteristics estimated by sound intensity method. Archives of Acoustics, 18, 2, 181–190.

Weyna S. (1995), The application of sound intensity technique in research on noise abatement in ships, Applied Acoustics, 44, 341–351.

Weyna S. (1996), An image of the energetic field in reduced parallelepiped room models, Acta Acustica, 82, 72–81.

Weyna S., Hojbjerg K. (1990), Acoustic power radiated by the hull partition on ship accommodation measured with spatial intensity vector, Proc. Inter-Noise’90, Gothenburg, 1073–1076.




DOI: 10.1515/aoa-2017-0023

Copyright © Polish Academy of Sciences & Institute of Fundamental Technological Research (IPPT PAN)