Ship's hull girder undergoes wave induced vertical and horizontal bending moment while navigating in seas. Both the bending moments are considered for ship strength. The horizontal bending moment in some conditions may influence ship maneuvering. This may occur due to rudder developing angle of attack because of hull girder deformation even though rudder angle is kept at 0°. In this study, the behavior of a bulk carrier ship in the wave for probabilistic longitudinal strength calculation is investigated. For large ships operating in random seas, it is necessary to investigate the longitudinal strength in waves. The bending moment of a bulk carrier for different wave conditions in fully loaded condition are investigated. For the probabilistic calculation of bending moment, North Atlantic wave data is used. The maximum bending moment usually occurs when the effective wavelength is of the order of ship's length. The computations are carried out in the head sea condition at zero forward speed of the vessel. The computation considers the sinkage and trim in wave. The bending moment in wave is compared with still water bending moment for fully loaded departure condition. The outcome of this investigation will suggest sufficient margin in the longitudinal strength during dynamic loading condition in heavy weather.
展开▼
