集装箱船等效设计波法中疲劳载荷概率系数的确定

为了在应用等效设计波方法时将船体梁载荷规范包络值、运动包络值、加速度包络值转换为疲劳评估载荷,需得到疲劳载荷概率系数这一重要参数。采用基于三维势流理论的水动力计算软件,分析多型集装箱船不同航速及超越概率的载荷长期预报值,得到用于疲劳评估的疲劳载荷概率系数的直接计算值。对直接计算值进行回归分析,拟合出各载荷的概率系数简化公式。结果表明,简化公式比较理想。

Confirmation of Probability Coefficient of Fatigue Loads of Equivalent Design Wave Method for Container Ship

Members of the International Association of classification societies have successively carried out the research on goal based rule of container ships based on the equivalent design wave method. In the equivalent design wave method, probability coefficient, which is an important parameter, is needed to convert the envelope value of hull girder load specification, motion envelope value and acceleration envelope value into fatigue assessment load. In this paper, the hydrodynamic calculation software based on three-dimensional potential flow theory is used to analyze the long-term load prediction values of different speed and exceedance probability of multi container ships, and the direct calculation value of fatigue load probability coefficient is obtained. Through regression analysis of the direct calculated value, the simplified formula of probability coefficient of each load is fitted. The results show that the simplified formula is ideal.