江、海波浪联合作用下的江海直达船疲劳性能研究

Investigation into fatigue performance of river-sea ships subjected to the combined effect of wave loads

    摘要
  • 摘要:
      目的  疲劳损伤是船舶工程中常见的结构损伤形式之一。江海直达船的结构要求比海船低、比江船高，还要求承受在江、海水域航行时不同波浪载荷的作用，其环境载荷复杂，结构疲劳问题有待深入研究。
      方法  在某江海直达集装箱船的基础上，结合谱分析法，以若干个舱口角隅点作为研究对象，进行江海直达船的结构疲劳性能研究；参考中国沿海长期波浪载荷数据，计算不同校核点处的疲劳损伤规律，研究疲劳损伤关于各短期海况的分布差异。
      结果  分析结果表明，海域疲劳损伤主要由有义波高为2.5~5 m和跨零周期为6~8 s的波浪所贡献。
      结论  考虑了江、海波浪联合作用后，目标船舶的结构疲劳寿命显著增加，而对江海直达船进行结构疲劳研究时，仅考虑海上波浪环境是不精确的。研究结果可为今后江海直达船的结构疲劳设计提供依据。

     

    Abstract:
      Objectives  Fatigue damage is considered to be common in marine engineering. River-sea ship is subjected to complex wave loads, which consist of river and sea. Its structural requirements lower than the sea, higher than the river boat. Fatigue strength of this type's structure needs further investigation.
      Methods  A container ship is taken as the research object in this paper. The fatigue strength of river-sea ship is based on spectral analysis, combined with the China's coastal long-term wave loads data. And the fatigue damage rules of different checking points under different conditions were obtained and the differences of fatigue damage on the distribution of short-term sea conditions were studied.
      Results  Analysis of the results shows that the fatigue damage in the sea area is mainly caused by the wave contribution of 2.5-5 m of significant wave height and 6-8 s of zero-crossing period.
      Conclusions  Considering the combined effect of the river-sea wave loads, the fatigue life of the structure of the target ship is significantly increased. So only consider the sea wave environment is too conservative. The results provide the basis for the structural fatigue design of river-sea ship in the future.

     

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