Ship motions in oblique regular waves
Ship motions in oblique regular waves
The motions/responses of displacement monohulls in oblique regular waves are investigated using a time domain approach. The five significant degrees of freedom are coupled through the equations of motion and solved to yield earth fixed rotational and translational displacements of the body. The coefficients in the equations are obtained using strip theory. As a consequence of this coupling and the forces acting on the body, the hullform cannot be assumed to be symmetric about its centreplane and a multi-parameter conformal mapping technique is developed which permits the transformation of asymmetric sections to a circle. Using this method the mapping of unusual sections such as large bulbous bows and propeller tunnels may be achieved. The added mass and damping values at the frequency of oscillation may then be determined by the definition of a potential for the circle oscillating on the free surface. The transfer functions obtained using this technique broadly agree with other strip theories and indicate significant improvements may be possible through the coupling mechanism and mapping procedures.
University of Southampton
Westlake, P.C.
466af667-03ac-4a95-9e28-0d1447afd119
Wilson, P.A.
8307fa11-5d5e-47f6-9961-9d43767afa00
20 February 1998
Westlake, P.C.
466af667-03ac-4a95-9e28-0d1447afd119
Wilson, P.A.
8307fa11-5d5e-47f6-9961-9d43767afa00
Westlake, P.C. and Wilson, P.A.
(1998)
Ship motions in oblique regular waves
(Ship Science Reports, 104)
Southampton, UK.
University of Southampton
89pp.
Record type:
Monograph
(Project Report)
Abstract
The motions/responses of displacement monohulls in oblique regular waves are investigated using a time domain approach. The five significant degrees of freedom are coupled through the equations of motion and solved to yield earth fixed rotational and translational displacements of the body. The coefficients in the equations are obtained using strip theory. As a consequence of this coupling and the forces acting on the body, the hullform cannot be assumed to be symmetric about its centreplane and a multi-parameter conformal mapping technique is developed which permits the transformation of asymmetric sections to a circle. Using this method the mapping of unusual sections such as large bulbous bows and propeller tunnels may be achieved. The added mass and damping values at the frequency of oscillation may then be determined by the definition of a potential for the circle oscillating on the free surface. The transfer functions obtained using this technique broadly agree with other strip theories and indicate significant improvements may be possible through the coupling mechanism and mapping procedures.
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Published date: 20 February 1998
Organisations:
Fluid Structure Interactions Group
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Local EPrints ID: 51248
URI: http://eprints.soton.ac.uk/id/eprint/51248
ISSN: 0140-3813
PURE UUID: 8cd1069c-95b3-4cb1-8e95-f574ee76b3d0
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Date deposited: 15 May 2008
Last modified: 16 Mar 2024 02:36
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Author:
P.C. Westlake
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