Stability Indices of Ships in Following Waves

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In order to clarify the stability indeces leading up to capsizing of a ship in severe following waves, the following research items have been done during the term of this project : 1) An Analysis of a Ship Capsizing in Quatering Seas, 2) Examination of Roll Damping Coefficients and Effective Wave Slope Coefficient for Small Passenger Crafts, 3) Stability Assessment of a Ship by Applying Risk Analysis based on the Capsizing Probability, 4) Preliminary Study Towards a Capsizing Simulator, 5) On the Improvement of Transverse Stability for High-Speed Craft, 6) A New Coordinate System and the Equation Describing Manoeuvring Motion of a Ship in Waves, 7) Time Domain Analysis of Ship Responses in Waves, 8) A Consideration on the Governing Equation of the Ship's Manoeuvering Motion in Waves, 9) A Representation of Asymmetric Waves of Finite Height, 10) A Physical-Mathematical Model of Hydrodynamic Forces and Moment Acting on a Hull During Large Drifting and Turning Motion Under the Conditions of Slow Speed. From this study the following results have been obtained : 1) The practical equations of motions to describe the motions of a ship in severe following waves have been shown from both theoretical and experimental considerations. Various physical mechanism that could be responsible for capsize have been pointed out by numerical experiments. 3) The capsizing simulator which will be helpful to give an operational guidance to avoid capsizing has been completed. 4) The prescribed roll damping and effective wave slope coefficients for small passenger crafts in the current Ship Stability Rule have been investigated.