超大型船舶由于弹振响应现象突出，在航行过程中更容易发生疲劳破坏。常规的梁理论法和准静态谱分析法都存在一定缺陷，无法准确分析弹振响应对船体结构疲劳的影响。本文为研究弹振响应下的疲劳评估问题及弹振疲劳的影响因素，在确定的工况和航速条件下，基于应力振型叠加法对某超大型矿砂船进行疲劳损伤计算，分析浪向角和短期海况对弹振疲劳的影响。结果表明：弹振响应使船体热点在高频段产生新的应力峰值，疲劳损伤度大大增加；弹振响应对疲劳的影响程度随浪向角和海况变化明显。本文结论对超大型船舶设计具有一定参考意义。
The springing response of ultra-large ships is serious, it is more prone to fatigue damage during sailing. Conventional beam theory method and quasi-static spectral analysis method have defects, it is unable to accurately analyze the effect of springing response on hull fatigue. To study the effect of springing response on fatigue and the influencing factors of springing fatigue, the fatigue damage of ultra-large ships is calculated based on the stress-mode superposition method under the determined loading conditions and speed, and the influence of wave angle and short-term sea state on springing fatigue is analyzed. The results show that: Fatigue stress response generates new stress peaks at high frequency, and fatigue damage is greatly increased considering the springing effect. The degree of influence of springing response on fatigue varies obviously with wave angle and sea state. The conclusions obtained have some reference significance for the design of ultra-large ships.
2023,45(2): 18-22 收稿日期：2022-01-09
DOI：10.3404/j.issn.1672-7649.2023.02.004
分类号：U661.4
基金项目：江苏省高等学校自然科学研究项目（18KJD580003）；南通市市级科技计划项目（JCZ20183）
作者简介：周陈炎(1993-),男,硕士,讲师,研究方向为船舶结构可靠性分析
