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This paper presents a description and some experimental results concerning the problem of parametric destabilization and roll motion resonant oscillation of ship moving in longitudinal encountering waves. This induced roll motion of a ship is of interest since it appears when moving in longitudinal waves, despite the fact that there is not any other oblique wave component to directly excite the transverse oscillation and the crew is not waiting anything like that in such a short time. The experiments were carried out on a reduced scale model of a small fishing vessel tested at the Naval Hydrodynamic Laboratory, Austral University of Chile * . The results show how those longitudinal encountering waves can develop big roll motion angles in a short time.

SCALE MODEL TESTS OF A FISHING VESSEL IN ROLL MOTION PARAMETRIC RESONANCE