DC ElementWertSprache
dc.contributor.authorTulin, Marshall P.-
dc.date.accessioned2011-02-02T15:35:43Zde_DE
dc.date.available2011-02-02T15:35:43Zde_DE
dc.date.issued1984de_DE
dc.identifier.other646228064de_DE
dc.identifier.urihttp://tubdok.tub.tuhh.de/handle/11420/933-
dc.description.abstractSurface waves from the ray point of view : delivered at the Fifteenth ONR Symposium on Naval Hydrodynamics, Hamburg, 3 September 1984 ; seventh Georg Weinblum memorial lecture Surface waves for the ray point of view VII. Georg-Weinblum-Gedächtnisvorlesung. Using the same procedure for the calcu1ation of the far field spectrum as in the case of the pressure patch, we have shown again that in asymptotic theory the boundary of the ship generates waves; for an observer above the hull only the upper side of the hull can generate waves. One set of these waves must have their wave vectors normal to the ship's hull, just as in the case of the pressure patch. However, because of the condition that the displacement flow follows the ship hull these waves have zero group velocity. They therefore propagate on a ray in ship coordinates tangent to the ship's hull and cannot leave the hull. These results are the same as those of Keller (1979). Another set of waves leave the aft portion of the hull on rays initially parallel to the ship's path, provided that the inclination of the hull is not steeper than -20°. We provide formula for calculating the strength of these waves which are in general both transverse and divergent. In principal this set of waves includes a fan at the bow (or stern) provided that a stagnation point exists at the point of the bow; the strength of these waves depends entirely on the gradient of the pressure (elevation) in the displacement at that point. We conclude that our present knowledge is inadequate either to know whether the conventional ray theory is valid near the ends of the hull or if it is, to use it effectively.en
dc.language.isoende_DE
dc.relation.ispartofseriesSchriftenreihe Schiffbau;446de_DE
dc.rightsinfo:eu-repo/semantics/openAccess-
dc.rights.urihttp://doku.b.tu-harburg.de/doku/lic_ohne_pod.phpde
dc.titleSurface waves from the ray point of view : delivered at the Fifteenth ONR Symposium on Naval Hydrodynamics, Hamburg, 3 September 1984 ; seventh Georg Weinblum memorial lecturede_DE
dc.typeTechnical Reportde_DE
dc.date.updated2011-02-14T10:01:59Zde_DE
dc.identifier.doi10.15480/882.931-
dc.type.dinireport-
dc.subject.bcl52.00:Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeinesde
dc.subject.bclcode52.00-
dc.subject.ddccode620-
dcterms.DCMITypeTextde_DE
tuhh.publikation.typreportde_DE
tuhh.opus.id1024de_DE
tuhh.gvk.ppn646228064de_DE
tuhh.oai.showtruede_DE
dc.identifier.hdl11420/933-
tuhh.abstract.englishSurface waves from the ray point of view : delivered at the Fifteenth ONR Symposium on Naval Hydrodynamics, Hamburg, 3 September 1984 ; seventh Georg Weinblum memorial lecture Surface waves for the ray point of view VII. Georg-Weinblum-Gedächtnisvorlesung. Using the same procedure for the calcu1ation of the far field spectrum as in the case of the pressure patch, we have shown again that in asymptotic theory the boundary of the ship generates waves; for an observer above the hull only the upper side of the hull can generate waves. One set of these waves must have their wave vectors normal to the ship's hull, just as in the case of the pressure patch. However, because of the condition that the displacement flow follows the ship hull these waves have zero group velocity. They therefore propagate on a ray in ship coordinates tangent to the ship's hull and cannot leave the hull. These results are the same as those of Keller (1979). Another set of waves leave the aft portion of the hull on rays initially parallel to the ship's path, provided that the inclination of the hull is not steeper than -20°. We provide formula for calculating the strength of these waves which are in general both transverse and divergent. In principal this set of waves includes a fan at the bow (or stern) provided that a stagnation point exists at the point of the bow; the strength of these waves depends entirely on the gradient of the pressure (elevation) in the displacement at that point. We conclude that our present knowledge is inadequate either to know whether the conventional ray theory is valid near the ends of the hull or if it is, to use it effectively.de_DE
tuhh.publication.instituteEntwerfen von Schiffen und Schiffssicherheit M-6de_DE
tuhh.identifier.doi10.15480/882.931-
tuhh.type.opusReport (Bericht)de
tuhh.institute.germanEntwerfen von Schiffen und Schiffssicherheit M-6de
tuhh.institute.englishShip Design and Ship Safety M-6en
tuhh.institute.id36de_DE
tuhh.type.id20de_DE
tuhh.gvk.hasppntrue-
tuhh.hasurnfalse-
tuhh.series.nameSchriftenreihe Schiffbau-
dc.type.driverreport-
dc.identifier.oclc930768220-
dc.type.casraiReporten
tuhh.relation.ispartofseriesSchriftenreihe Schiffbau-
tuhh.relation.ispartofseriesnumber446de
item.tuhhseriesidSchriftenreihe Schiffbau-
item.fulltextWith Fulltext-
item.creatorGNDTulin, Marshall P.-
item.creatorOrcidTulin, Marshall P.-
item.grantfulltextopen-
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