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Investigation of coupled sway, roll and yaw motions of a floating body: numerical modelling for non-linear restoring
Citation
Das, SK and Das, SN and Sahoo, PK, Investigation of coupled sway, roll and yaw motions of a floating body: numerical modelling for non-linear restoring, Ships and Offshore Structures, 3, (1) pp. 49-56. ISSN 1744-5302 (2008) [Refereed Article]
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Copyright Statement
The definitive published version is available online at: http://www.tandf.co.uk/journals
Official URL: http://www.tandf.co.uk/journals
DOI: doi:10.1080/17445300701733488
Abstract
The article deals with the numerical modelling of sway, roll and yaw motions of a floating
body in time domain and investigates motion instability primarily due to non-linear roll restoring
characteristics in the absence of auto piloting mechanism. To compute hydrodynamic forces, we
consider non-linear roll restoring characteristics and speed dependent strip theory that are obtained
from the Frank's close-fit method. The governing equations are solved numerically by using RungeKutta-
Gill method with adaptive step size adjustment algorithm. In order to illustrate non-linear roll
restoring effect in sway.troll and yaw, numerical experiments have been carried out for a Panamax
container ship under the action of sinusoidal wave of periodicity 11.2 s with varying wave height and
speed. To emulate the soft spring behaviour in roll, the expression for non-linear restoring moment
is represented by an odd order polynomial of roll angle. Further, in the absence of zero restoring
mechanism in sway and yaw, the effect of initial condition, wave height and ship's speed is examined
in terms of ship's stability. This approach provides an important guideline to model non-linear roll
restoring moment for a coupled system in three degrees of freedom.
Item Details
Item Type: | Refereed Article |
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Keywords: | Sway; roll; yaw; numerical modelling; roll restoring; Froude-Krylov force |
Research Division: | Engineering |
Research Group: | Maritime engineering |
Research Field: | Ship and platform structures (incl. maritime hydrodynamics) |
Objective Division: | Transport |
Objective Group: | Water transport |
Objective Field: | International sea freight transport (excl. live animals, food products and liquefied gas) |
UTAS Author: | Sahoo, PK (Dr Prasanta Sahoo) |
ID Code: | 53973 |
Year Published: | 2008 |
Deposited By: | NC Maritime Engineering and Hydrodynamics |
Deposited On: | 2009-02-03 |
Last Modified: | 2011-11-28 |
Downloads: | 1 View Download Statistics |
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