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Non-linear Behaviour in the Seakeeping of High Speed Craft


Davidson, G and Lavroff, J and Davis, MR and Thomas, GA and Binns, JR and Freizer, S and Roberts, T, Non-linear Behaviour in the Seakeeping of High Speed Craft, Proceedings of the 12th International Conference on Fast Sea Transportation, 2-5 December 2013, Amsterdam, pp. 1-7. (2013) [Refereed Conference Paper]

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Non-linear behaviour in high speed craft motions can be attributed to high Froude number, increasing wave height and the variable above water-line geometry; wet deck slamming will add to the non-linear phenomena. When comparing wave piercing catamarans (WPC) to mono-hulls, conventional or semi-swath catamarans and trimarans it may be expected that the non-linear behaviour will vary with vessel type. Little data has been published to date on this behaviour possibly due to the difficulty or expense in determining the non-linear effects with limitations on software meaning the only viable alternative is model testing with the subsequent expense. Model tests of a typical WPC show strong non-linear behaviour in head seas at high Froude numbers with increasing wave height. The effect can be seen in non-linear pseudo transfer functions or response amplitude operators (RAOs) where the resonant peak of the heave transfer function reduces as the wave amplitude is increased. The pitch transfer functions show similar non-linear behaviour but not to the same extent as the heave. Little non-linear behaviour is seen at lower Froude numbers.

Item Details

Item Type:Refereed Conference Paper
Research Division:Engineering
Research Group:Maritime engineering
Research Field:Naval architecture
Objective Division:Transport
Objective Group:Water transport
Objective Field:Domestic passenger water transport (e.g. ferries)
UTAS Author:Lavroff, J (Dr Jason Ali-Lavroff)
UTAS Author:Davis, MR (Professor Michael Davis)
UTAS Author:Thomas, GA (Professor Giles Thomas)
UTAS Author:Binns, JR (Professor Jonathan Binns)
ID Code:88748
Year Published:2013
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2014-02-13
Last Modified:2014-10-22
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