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dc.contributor.advisorGreco, Marilenanb_NO
dc.contributor.authorGeyssel, Johannes Joachim Kalevinb_NO
dc.date.accessioned2014-12-19T12:09:46Z
dc.date.available2014-12-19T12:09:46Z
dc.date.created2013-09-16nb_NO
dc.date.issued2013nb_NO
dc.identifier648727nb_NO
dc.identifierntnudaim:9174nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/238562
dc.description.abstractThe main purpose of this Master thesis is to provide insights about thesensitivity of parametric roll occurrence. Parametric roll resonance may leadto large roll angles experienced by the ship typically in longitudinal waves. Itis related to the periodic change of stability when the ship's wave encounterfrequency is approximately twice the rolling natural frequency and the dampingof the ship to dissipate the parametric roll energy is not sucient to avoidthe onset of a resonant condition. This study contains a brief description ofthis physical phenomenon and presents the state of the art in terms of theoretical,numerical and physical modeling.Using free decay tests, a parameter analysis is carried out, including linearand quadratic damping corrections. The inuence of the parametric rolloccurrence relative to appendages such as skeg or bilge keels is carried outusing the 6DoF potential ow solver. The numerical results are presented asa function in time, showing the amplitudes in heave, roll and pitch.A 1.5DoF model is chosen to investigate the parametric roll resonance ona shing vessel. The inuence on the occurrence and features of the phenomenonare analyzed using this model. Hence the reliability and applicabilityof the simplied approach is discussed. Comparing the 1.5DoF modelresults with experimental results of scaled model testing of the same shingvessel, a validation of the model is performed, showing that the model isconsistent with the experiments.nb_NO
dc.languageengnb_NO
dc.publisherInstitutt for marin teknikknb_NO
dc.titleNumerical and Experimental Investigation of Parametric Rollnb_NO
dc.typeMaster thesisnb_NO
dc.source.pagenumber84nb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for ingeniørvitenskap og teknologi, Institutt for marin teknikknb_NO


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