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Parametric rolling in head seas - an Australian perspective

Citation

Thomas, GA and Gehling, R and Duffy, JT and Lilienthal, T and Watts, R, Parametric rolling in head seas - an Australian perspective, The 6th Osaka colloquium on seakeeping and stability of ships : OC 2008 seakeeping & stability, proceedings, 26 - 29 March 2008, Osaka, pp. 312-317. (2008) [Refereed Conference Paper]


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Official URL: http://www.marine.osakafu-u.ac.jp/

Abstract

The onset of parametric rolling in head seas has been known to cause serious safety issues for ships, particularly containerships. The aim of this work was to investigate the prediction of the occurrence of parametric roll and the factors which influence it. The threshold boundaries, for the inception of parametric roll for a typical containership were established using the Mathieu equation. A series of model experiments was then conducted to validate the theoretical predictions for the inception of parametric roll and investigate the influence of wave height, wave length and GM on the inception of parametric roll. For all the GM values tested reasonable agreement was found between the numerical predictions and the experimental results. A reduction in wave height was found to reduce the range of encounter frequencies for which parametric roll will occur. Parametric roll was found to occur for a range of wavelengths provided that the encounter wave period was in the critical range.

Item Details

Item Type:Refereed Conference Paper
Keywords:Parametric roll, containerships, head seas, model experiments
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Ship and Platform Hydrodynamics
Objective Division:Transport
Objective Group:Water Transport
Objective Field:International Sea Freight Transport (excl. Live Animal Transport)
Author:Thomas, GA (Professor Giles Thomas)
Author:Duffy, JT (Dr Jonathan Duffy)
Author:Lilienthal, T (Mr Tim Lilienthal)
Author:Watts, R (Mr Ryan Watts)
ID Code:53953
Year Published:2008
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2009-02-02
Last Modified:2012-12-12
Downloads:10 View Download Statistics

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