小水线面双体船减摇鳍的疲劳强度分析

针对某大型小水线面双体船两种连接方式的减摇鳍，即轴连接式和插入式减摇鳍，分别建立有限元模型，计算应力响应传递函数，确定减摇鳍疲劳累积损伤度，并对比两种类型减摇鳍的损伤结果特性。结果表明:减摇鳍与小水线面双体船下潜体相交各个部位热点应力较大，容易产生疲劳问题，且轴连接式减摇鳍的疲劳损伤比插入式的略为严重大，在设计和建造时应对这些部位重点关注。

Research on the fatigue Strength Assessment of the Stabilizing Fins of SWATH

The small water area twin hull (SWATH) has two types of stabilizing fins--that is a Shaft connection type of stabilizing fin and a Plug-in connection type of stabilizing fin. The finite element models of the stabilizing fins were built. The stress response of transfer function was calculated.The spectral analysis method were adopted to make the fatigue strength assessment of the stabilizing fins of SWATH. The results of damage were analyzed and compared. The results show that the damage is larger than other areas in the intersection areas between the stabilizing fins and the diving body of SWATH. The damage of the Shaft connection type of stabilizing fin is larger than the Plug-in connection type of stabilizing fin. These problems should be focused when the SWATH was designed and built.