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Numerical and Experimental Investigation of Parametric Roll
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Marine Technology.
2013 (English)MasteroppgaveStudent thesis
Abstract [en]

The main purpose of this Master thesis is to provide insights about the sensitivity of parametric roll occurrence. Parametric roll resonance may lead to large roll angles experienced by the ship typically in longitudinal waves. It is related to the periodic change of stability when the ship's wave encounter frequency is approximately twice the rolling natural frequency and the damping of the ship to dissipate the parametric roll energy is not sucient to avoid the onset of a resonant condition. This study contains a brief description of this 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 linear and quadratic damping corrections. The inuence of the parametric roll occurrence relative to appendages such as skeg or bilge keels is carried out using the 6DoF potential ow solver. The numerical results are presented as a function in time, showing the amplitudes in heave, roll and pitch. A 1.5DoF model is chosen to investigate the parametric roll resonance on a shing vessel. The inuence on the occurrence and features of the phenomenon are analyzed using this model. Hence the reliability and applicability of the simplied approach is discussed. Comparing the 1.5DoF model results with experimental results of scaled model testing of the same shing vessel, a validation of the model is performed, showing that the model is consistent with the experiments.

Place, publisher, year, edition, pages
Institutt for marin teknikk , 2013. , 84 p.
URN: urn:nbn:no:ntnu:diva-22272Local ID: ntnudaim:9174OAI: diva2:648727
Available from: 2013-09-16 Created: 2013-09-16 Last updated: 2013-09-16Bibliographically approved

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