Underwater acoustic scattering from a radially layered cylindrical obstacle in a 3D ocean waveguide

Prospathopoulos, AM; Athanassoulis, GA; Belibassakis, KA

dc.contributor.author	Prospathopoulos, AM	en
dc.contributor.author	Athanassoulis, GA	en
dc.contributor.author	Belibassakis, KA	en
dc.date.accessioned	2014-03-01T01:32:14Z
dc.date.available	2014-03-01T01:32:14Z
dc.date.issued	2009	en
dc.identifier.issn	0022-460X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20096
dc.subject	Acoustic Scattering	en
dc.subject	Linear System	en
dc.subject	Normal Modes	en
dc.subject	Point Source	en
dc.subject	Recursion Relation	en
dc.subject	Series Expansion	en
dc.subject	Shallow Water	en
dc.subject	Underwater Acoustics	en
dc.subject	Low Frequency	en
dc.subject	Transmission Loss	en
dc.subject.classification	Acoustics	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	Acoustic field measurement	en
dc.subject.other	Acoustic fields	en
dc.subject.other	Acoustics	en
dc.subject.other	Linear systems	en
dc.subject.other	Oceanography	en
dc.subject.other	Scattering	en
dc.subject.other	Underwater acoustics	en
dc.subject.other	Waveguides	en
dc.subject.other	3d problems	en
dc.subject.other	Acoustic scatterings	en
dc.subject.other	Axisymmetric	en
dc.subject.other	Benchmark solutions	en
dc.subject.other	Coupled modes	en
dc.subject.other	Cylindrical interfaces	en
dc.subject.other	Cylindrical rings	en
dc.subject.other	Density profiles	en
dc.subject.other	Expansion coefficients	en
dc.subject.other	Harmonic points	en
dc.subject.other	Low frequencies	en
dc.subject.other	Matching conditions	en
dc.subject.other	Ocean environments	en
dc.subject.other	Ocean waveguides	en
dc.subject.other	Recursive relations	en
dc.subject.other	Series expansions	en
dc.subject.other	Sound speeds	en
dc.subject.other	Speed profiles	en
dc.subject.other	Successive rings	en
dc.subject.other	Transmission losses	en
dc.subject.other	Unknown coefficients	en
dc.subject.other	Acoustic wave scattering	en
dc.title	Underwater acoustic scattering from a radially layered cylindrical obstacle in a 3D ocean waveguide	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jsv.2008.06.054	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jsv.2008.06.054	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	A solution based oil coupled mode expansions is presented for the 3D problem of acoustic scattering from a radially layered penetrable cylindrical obstacle in a shallow-water planc-horizontal waveguide. Each cylindrical ring is characterized by a general, vertical Sound speed and density profile (ssdp), the ocean environment around the obstacle can be also considered horizontally stratified with a depth-arbitrary ssdp, and the bottom is assumed to be rigid, The total acoustic field generated by an harmonic point source is represented as a normal-mode series expansion. The expansion coefficients are calculated exploiting the matching conditions at the cylindrical interfaces, which results in in infinite linear system. The system is appropriately truncated and numerically solved by using a recursive relation, which involves the unknown coefficients of two successive rings. Results concerning the transmission loss outside and inside obstacles consisting of three cylindrical rings are given for a typical depth-dependent ocean sound-speed profile. The presented solution can serve as a benchmark solution to the general problem of 3D acoustic scattering from axisymmetric inhomogeneities in ocean waveguides, at low frequencies. (C) 2008 Elsevier Ltd. All rights reserved.	en
heal.publisher	ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD	en
heal.journalName	Journal of Sound and Vibration	en
dc.identifier.doi	10.1016/j.jsv.2008.06.054	en
dc.identifier.isi	ISI:000262169300032	en
dc.identifier.volume	319	en
dc.identifier.issue	3-5	en
dc.identifier.spage	1285	en
dc.identifier.epage	1300	en