Abstract
The International Maritime Organization has developed the second-generation intact stability criteria. Thus, damage stability criteria can be established in the future. In order to identity the capsizing probability of damaged ship under dead ship condition, this paper investigates two methods that can be used to research the capsizing probability in time domain, which mainly focus on the nonlinear righting lever GZ curve solution. One method subjects the influence of damaged tanks on the hull shape down to the wind and wave, and the other method is consistent with the real-time calculation of the GZ curve. On the basis of one degree of freedom rolling equation, the solution is Monte Carlo method, and a damaged fishery bureau vessel is taken as a sample ship. In addition, the results of the time-domain capsizing probability under different loading conditions are compared and analyzed. The relation of GM and heeling angle with the capsizing probability is investigated, and its possible reason is analyzed. On the basis of combining the time-domain flooding process with the capsizing probability calculation, this research aims to lay the foundation for the study of capsizing probability in time domain under dead ship condition, as well as provide technical support for capsizing mechanism of dead ship stability and damage stability criteria establishment in waves.
Highlights
1 Introduction The International Maritime Organization (IMO) is currently working on formulating and revising the stability standards, which are applicable to satisfy the standards in still water but still capsize in waves (IMO SDC 1/INF, 2014b)
The results show that various loading conditions can still lead to different flooding times even with the same damage condition
The 1-DOF rolling equation is formulated through the Monte Carlo method, which combines the flooding process in the time domain of damaged ships with the capsizing probability research
Summary
The International Maritime Organization (IMO) is currently working on formulating and revising the stability standards, which are applicable to satisfy the standards in still water but still capsize in waves (IMO SDC 1/INF, 2014b). Roll, and sway, and the amplitude of motion can become unfavorable under bad conditions. If a large-scale rolling motion occurs and the restoring moment is insufficient, ships will capsize. Ship capsizing in wind and wave is a strongly nonlinear problem, which involves nonlinear rolling motion, nonlinear restoring moment, nonlinear wave moment, and its interaction with the ship hull. Dead ship behavior is the resonance roll when ships lose power without a forward speed; this behavior is one of the five major capsizing modes that the IMO must cover through new-generation intact stability criteria (Ogawa, 2009). Once ships are damaged under dead ship condition, their motion in waves and the strong nonlinearity of the system complicate ship capsizing in wind and waves. Investigating the dead ship stability and capsizing mechanism of damaged ships under severe sea conditions is necessary
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