Investigation of Ship Structural Design Method by Means of Structural Reliability Approach and Design Irregular Wave Method

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This study aimed to examine the statistical characteristics of ship response in irregular sea way on the assumption that the design irregular wave method is used in the hull structural design and to propose a more accurate structural design method. Stresses generated in the hull-girder of a ship in irregular waves appear as the superposition of the flexible vibration component that varies in the natural frequency of the hull on the hydrodynamic component varying in encounter period with the waves. In the research, the probability distribution pattern of maximum response of a ship in irregular wave is investigated and the effect of flexible vibration component on the fatigue damage isclarified.