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

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.

Keywords

• dead ship stability
• Level 2 vulnerability criteria
• local linearization method
• capsizing probability