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Mitigation of slamming of large wave-piercing catamarans


Shahraki, JR and Davis, MR and Shabani, B and AlaviMehr, J and Thomas, GA and Lavroff, J and Amin, WAI, Mitigation of slamming of large wave-piercing catamarans, Proceedings of the 30th Symposium on Naval Hydrodynamics, 2-7 November 2014, Hobart, Tasmania, pp. 1-13. ISBN 9781862958500 (2016) [Refereed Conference Paper]

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The Wave Piercing Catamaran (WPC) design of INCAT Tasmania reduces motion responses in moderate seas and provides a high level of protection against deck diving in large seas. However, in large seas slamming will occur as the arch between outboard and central bow hulls fills, imposing large transient loads which can exceed the vessel weight. Consideration is given here to reducing slam loadings by variation of key geometric parameters of the WPC bow design and by operation of ride control system (RCS). Due to the complexity of wave slam loads, model testing provides an essential basis for design development and validation of numerical solutions. A segmented hydro-elastic model of the 112m INCAT WPC has been developed with adjustable height of the wet deck and length of the centre bow. Dynamic wave slam forces and whipping responses are modeled on the basis of the whipping mode frequency and damping. It is found that increases of wet deck height reduce impulsive slam loadings but lead to increased motions. Shorter centre bows reduce slam loadings and also reduce the vessel pitch motions. When the ride control system (RCS) is operated as a pitch damper the relative motion between the centre bow and water surface can be reduced by as much as 58% at the frequency of maximum relative motion. This reduction will confer significant benefits in terms of slam amelioration. The maximum relative bow motion occurs at a dimensionless encounter frequency corresponding closely to that at which most severe slamming is observed in the model test program.

Item Details

Item Type:Refereed Conference Paper
Keywords:slamming, large wave-piercing catamarans
Research Division:Engineering
Research Group:Mechanical engineering
Research Field:Mechanical engineering not elsewhere classified
Objective Division:Transport
Objective Group:Water transport
Objective Field:Domestic passenger water transport (e.g. ferries)
UTAS Author:Shahraki, JR (Mr Jalal Rafieshahraki)
UTAS Author:Davis, MR (Professor Michael Davis)
UTAS Author:Shabani, B (Dr Babak Shabani)
UTAS Author:AlaviMehr, J (Dr Javad Mehr)
UTAS Author:Thomas, GA (Professor Giles Thomas)
UTAS Author:Lavroff, J (Dr Jason Ali-Lavroff)
UTAS Author:Amin, WAI (Dr Walid Amin)
ID Code:96411
Year Published:2016
Deposited By:Engineering
Deposited On:2014-11-04
Last Modified:2018-04-05

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