基于族效应的波浪和砰击诱导应力的随机组合

为了考查砰击的族效应对波浪和砰击诱导组合应力极值的影响，定义了泊松砰击族过程。利用Hansen的结果，确定平均族间距以及砰击族发生率。当确定了相继两族砰击之间的组合极值后，可按传统的泊松砰击模型确定组合极值。数值分析表明，对于弱阻尼结构，考虑族效应会导致组合极值升高；对于强阻尼结构，考虑族效应会导致组合极值下降。

Stochastic Combination of Wave and Slamming-Induced Stresses Based on the Cluster Effect of Slamming

In order to examine the cluster effect of slamming on the extreme combined value of the wave and slamming-induced stresses, a Poisson cluster process was defined. By means of Hansen's research results, the mean time interval between successive slamming clusters and the rate of occurrence of slamming clusters were determined. The extreme combined stresses between two successive slamming clusters were determined, then the combined extreme stresses could be determined by the classical Poisson slamming model. The numerical analysis shows that, for the ship hull structure with smaller damping, the cluster effect can result in the increase of extreme combined stresses; as for the ship hull structure with larger damping, the cluster effect can result in the decrease of extreme combined stresses.