The influence of vertical towed array on seakeeping performance of aSWATH vessel was investigated in frequency domain by the boundaryelement method based on the three dimensional translating-pulsatingsource Green Function (3DTP). Three factors that differ fromconventional monohull ships, but may have great influence on SWATHwere included in the motion equations, namely the hydrodynamicinteraction between the twin hulls, the viscous damping and the effectof the stabilizing fins. Comparisons of motion transfer functions withthe experimental results were made to validate the present method.Then the influence of the vertical towed array was added to the motionequations by modifying the added mass, damping coefficients and waveexcitation forces. The results indicate that the motion responses of theSWATH vessel decrease with the presence of the vertical towed array,especially at the resonant zone. The reason for this phenomenon lies inthe increases of both the heave-heave damping coefficient and pitchpitchdamping coefficient.
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