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A high Froude number time-domain strip theory for ship motion predictions in irregular waves
Citation
French, Benjamin and Thomas, G and Davis, M and Holloway, D, A high Froude number time-domain strip theory for ship motion predictions in irregular waves, Proceedings of the 18th Australasian Fluid Mechanics Conference, 3-7 December, Launceston, Tasmania, Australia, pp. 1-4. ISBN 9780646583730 (2012) [Refereed Conference Paper]
Copyright Statement
Copyright 2012 Leishman Associates
Official URL: http://www.proceedings.com/17862.html
Abstract
The prediction of ship motion characteristics early in the design stage in realistic sea conditions are of vital importance for the ship designer. Strip theories are commonly used for this purpose as they are fast and inexpensive. In this paper, an existing two-dimensional time-domain strip theory optimised for multi-hull vessels travelling at high Froude numbers is extended to predict motions in an irregular seaway. The encountered wave environment is represented by the superposition of regular sinusoidal waves. A method for decomposing idealised sea spectra into component regular waves of varying frequencies and constant amplitudes is presented. Ship motion predictions in irregular waves are then verified by conducting a spectral analysis on the motions and wave environment and comparing with motion predictions in regular waves. A method of ensemble averaging of spectra over a series of runs is adopted to reduce spectral variance. The extended seakeeping method is then validated by comparing predicted motions of a large high-speed catamaran in irregular seas with scale model results from towing tank experiments.
Item Details
Item Type: | Refereed Conference Paper |
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Research Division: | Engineering |
Research Group: | Maritime Engineering |
Research Field: | Ship and Platform Hydrodynamics |
Objective Division: | Transport |
Objective Group: | Water Transport |
Objective Field: | Passenger Water Transport |
UTAS Author: | French, Benjamin (Dr Benjamin French) |
UTAS Author: | Thomas, G (Professor Giles Thomas) |
UTAS Author: | Davis, M (Professor Michael Davis) |
UTAS Author: | Holloway, D (Dr Damien Holloway) |
ID Code: | 82614 |
Year Published: | 2012 |
Deposited By: | NC Maritime Engineering and Hydrodynamics |
Deposited On: | 2013-02-07 |
Last Modified: | 2014-08-12 |
Downloads: | 1 View Download Statistics |
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