螺旋桨激励下舰船外板机械疲劳寿命预测准确度分析

Analysis of prediction accuracy of mechanical fatigue life of ship outer plate under propeller excitation

机械疲劳是引起船体结构破坏的主要原因。无论是军用还是民用船舶,都存在着疲劳的问题。全球发生过很多海难,机械疲劳导致的问题已经成为各国船级社关注的重点。当前,船舶正向高速、大型化方向发展,其单机性能得到迅速提升。但是,由于受多种因素的制约,推进器的直径不能过大,否则会造成推进器负荷和激振力增大。鉴于许多高速船舶在使用1~6个月后,其外板的板面会产生裂缝,本文就此问题进行分析,并对其进行了疲劳寿命预测。

Mechanical fatigue is the main cause of the damage of the hull structure. Both military and civilian ships,there is the problem of fatigue. There have been many maritime accidents around the world, and the problem caused by mechanical fatigue has become the concern of the classification societies around the world. At present, ships are developing towards high speed and large scale, and the performance of its single machine has been rapidly improved. However, due to the restriction of many factors, the diameter of the propeller cannot be increased too large, resulting in the load of the propeller and the excitation force of the propeller. In view of the cracks in the outer plate of many high-speed ships after one to six months, this problem is analyzed in this paper.