Abstract
Strip theory for a single running ship is applied to predict the coupled motions of smallaterplane area twin-hull (SWATH) ships, with and without speed, in waves. The hydrodynamic coefficients, in cluding the interactions between two hulls, are analyzed in a twodimensional manner and an integral equation method is utilized. To obtain the exciting force the three-dimensional diffraction potential is temporarily maintained during the derivation and finally replaced by the two-dimensional one. Neglecting the surge motion, five modes motions are obtained. The validity of the present theoretical prediction of SWATH motions is well confirmed by the existing model experimental results even in a following sea at high speed. Artificial damping due to the fin and viscosity is tested and found to give improvement in the resonant region of motion.
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