Seakeeping Quality of Small Volume Hull Form above Water Plane (1st Report)

Abstract

Effect of hull form above water plane is studied on vertical ship motions. Ship motion test in regular head wave is carried out with use of series model ships, which have different breadth and different bow profile above water plane. The breadth above water plane varies from 100% to 40% of maximum water breadth. Result of the ship motion test shows that the vertical ship motions become small depending on reduction of the breadth of model ship above water plane. Furthermore vertical forced oscillation test and wave exciting force measurement are carried out with use of the 55% breadth model ship. Results of these experiments show that radiation forces and wave exciting forces acting on the model ship are fully nonlinear against the amplitude of forced oscillation and the incident wave amplitude.