Westlake, P.C. and Wilson, P.A.
Ship motions in oblique regular waves. Southampton, UK, University of Southampton, 89pp.
(Ship Science Reports, 104).
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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