基于局部线性化方法的瘫船稳性敏感性分析及衡准完善

Sensibility analysis and further development for dead ship stability criteria based on local linearization method

    摘要
  • 摘要:
      目的  瘫船稳性是当船舶失去动力后，在横风横浪状态下发生共振横摇甚至倾覆的运动模式，是公认的较危险的稳性失效模式。国际海事组织（IMO）船舶设计与建造分委会（SDC）预计将于2019年完成第2代完整稳性衡准规则定稿，目前亟需大量的样船计算以完善规则。
      方法  基于局部线性化方法，对3艘集装箱船进行了瘫船稳性第2层衡准校核计算，并分析了瘫船稳性敏感性与船舶各设计参数的关系。
      结果  分析结果表明，随着船舶吃水深度的增大，船舶倾覆概率将先增大后减小，并对第2层衡准的标准值选取及衡准完善提出了建议。
      结论  可为瘫船稳性衡准研究提供技术支持。

     

    Abstract:
      Objectives  The dead ship stability, which is defined as a ship losing its power and rolling after turning into beam seas, is recognized as a dangerous stability failure mode. The International Maritime Organization(IMO) and its sub-committee on Ship Design and Construction (SDC) are expected to finalize the second-generation intact stability criteria in 2019, while a number of sample calculations are currently required for its perfection.
      Methods  In this paper, a Level 2 criterion for dead ship stability is conducted for three container ships based on the local linearization method.
      Results  Ship design parameters which can influence the probability of capsizing are investigated, and it is concluded that a ship's capsizing probability may first decrease and then increase as draft increases. Besides, standard value for Level 2 criterion is proposed and several suggestions are raised for the improvement of IMO dead ship stability criteria.
      Conclusions  This study has a certain value in engineering application and provides technical support for the further development of dead ship stability criteria.

     

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