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

本研究的目的是在船体结构设计中采用设计不规则波法的假设下，检验船舶在不规则海道中响应的统计特征，提出一种更精确的结构设计方法。不规则波浪作用下船体梁内产生的应力表现为随船体固有频率变化的柔性振动分量与随波浪遇到周期变化的水动力分量的叠加。研究了舰船在不规则波浪作用下最大响应的概率分布规律，阐明了柔性振动分量对舰船疲劳损伤的影响。

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.