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An analytic study on the hull characteristics of ship accidents at low capsizing speeds
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 Title & Authors
An analytic study on the hull characteristics of ship accidents at low capsizing speeds
Choi, Soon-Man;
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The capsizing speed of an unstable vessel with a lost restoring moment can be understood as a unique response to an accident situation, and is naturally affected by such parameters as moment of inertia, metacentric height, and transverse damping coefficient of the hull in the case of free roll motion. Additionally, it is supposed that the analysis of capsize accidents can be further simplified when a vessel`s leaning velocity is shown to be quite low. Therefore, capsize accidents with low leaning speeds are desirably categorized in view of rescuing strategies, as opposed to fast capsize accidents, since the attitude of the declining hull can be properly estimated, which allows rescuers to have more time for helping accident cases. This study focuses on deriving some analytical equations based on the roll decay ratio parameter, which describes how a hull under a low-speed capsize is related to the situational hull characteristics. The suggested equations are applied to a particular ship to disclose the analytical responses from the model ship. It was confirmed that the results show the general characteristics of slow capsizing ships.
Transverse ship motion;Capsizing ship accidents;Slow capsize;Roll decay ratio;Transverse damping coefficient;
 Cited by
M. Asghari, H. Zeraatgar, and F. Bakhtiari-Nejad, "An analytical and experimental study on dynamic stability of a vessel," Archives of Civil and Mechanical Engineering, vol. 7, no. 3, pp. 33-44, 2007. crossref(new window)

S. Surendran and J. V. R. Reddy, "Numerical simulation of ship stability for dynamic environment," Ocean Engineering, vol. 30, no. 10, pp. 1315-1317, 2003.

A. W. Vredeveldt and J. M. Journee, "Roll motions of ships due to sudden water ingress, calculations and experiments," International Conference on Ro-Ro Safety and Vulnerability the Way Ahead, RINA, vol. 1, pp. 13-30, 1991.

S. Kruger and F. Kluwe, "A simplified method for the estimation of the natural roll frequency of ships in heavy weather," HANSA International Maritime Journal, Bd 145, 2008. [Online]. Available:

Scott M. Vanden Berg, Non-Linear Rolling of Ships in Large Sea Waves, Ph.D. Dissertation, Naval Postgraduate School, Monterey, California, 2007.

A. Papanikolaou, E. Boulougouris, and D. Spanos, "On the roll radius of gyration of ro-ro passenger ships," Proceedings of the 7th International Ocean and Polar Engineering Conference, vol. 3, pp. 499-506, 1997.

IMO Resolution A.749, "Code on Intact for all Type of Ships Covered by IMO instruments," 1993.