Radiated Sound Power from Near-Surface Acoustic Sources

Karimi, M; Kinns, R; Kessissoglou, N

Radiated Sound Power from Near-Surface Acoustic Sources

Karimi, M

Kinns, R Kessissoglou, N

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Publisher:: SOC NAVAL ARCHITECTS & MARINE ENGINEERS
Publication Type:: Journal Article
Citation:: Journal of Ship Research, 2022, 66, (2), pp. 151-158
Issue Date:: 2022-06-01

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Field	Value	Language
dc.contributor.author	Karimi, M https://orcid.org/0000-0002-2949-5364
dc.contributor.author	Kinns, R
dc.contributor.author	Kessissoglou, N
dc.date.accessioned	2023-03-12T23:35:45Z
dc.date.available	2023-03-12T23:35:45Z
dc.date.issued	2022-06-01
dc.identifier.citation	Journal of Ship Research, 2022, 66, (2), pp. 151-158
dc.identifier.issn	0022-4502
dc.identifier.issn	1542-0604
dc.identifier.uri	http://hdl.handle.net/10453/167102
dc.description.abstract	This article investigates the radiated sound power from idealized propeller noise sources, characterized by elemental monopole and dipole acoustic sources near the sea surface. The free surface of the sea is modeled as a pressure-release surface. The ratio of sound power of the near surface sources to the sound power from the same sources in an unbounded fluid is presented as a function of source immersion relative to sound wavelength. We herein show that the sound power radiated by submerged monopole and horizontal dipole sources is greatly reduced by the effect of the free surface at typical blade passing frequencies. By contrast, the sound power from a submerged vertical dipole is doubled. A transition frequency for the submerged monopole and horizontal dipole is identified. Above this transition frequency, the radiated power is not significantly influenced by the sea surface. Directivity patterns for the acoustic sources are also presented.
dc.language	English
dc.publisher	SOC NAVAL ARCHITECTS & MARINE ENGINEERS
dc.relation.ispartof	Journal of Ship Research
dc.relation.isbasedon	10.5957/JOSR.04200025
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0911 Maritime Engineering
dc.subject.classification	Civil Engineering
dc.title	Radiated Sound Power from Near-Surface Acoustic Sources
dc.type	Journal Article
utslib.citation.volume	66
utslib.for	0911 Maritime Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	open_access	*
dc.date.updated	2023-03-12T23:35:44Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	66
utslib.citation.issue	2

Abstract:

This article investigates the radiated sound power from idealized propeller noise sources, characterized by elemental monopole and dipole acoustic sources near the sea surface. The free surface of the sea is modeled as a pressure-release surface. The ratio of sound power of the near surface sources to the sound power from the same sources in an unbounded fluid is presented as a function of source immersion relative to sound wavelength. We herein show that the sound power radiated by submerged monopole and horizontal dipole sources is greatly reduced by the effect of the free surface at typical blade passing frequencies. By contrast, the sound power from a submerged vertical dipole is doubled. A transition frequency for the submerged monopole and horizontal dipole is identified. Above this transition frequency, the radiated power is not significantly influenced by the sea surface. Directivity patterns for the acoustic sources are also presented.

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http://hdl.handle.net/10453/167102