Study on Stability Standards of ship

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Stability standards of domestic and international regulation are reviewed for ships in beam sea condition. Critical situations leasing up to capsizing of a ship in following quartering seas an investigated for stability standard. An analytical and experimental study of the side force and yaw moment on a ship model towed in severe quartering waves has been conducted. In order to investigate the side force on the ship with heave and pitch motions in a very low encounter frequency, extensive model tests have been carried out. The side force is divided into Froude-Krylov force, diffraction force and lift, and discussed in detail. The effects of heave and pitch motions to side force on the ship are investigated by taking into account the change of submerged sectional area Comparisons of the experimentally determined force on the model and a theoretical prediction are presented. Critical situations le ading up to capsize are pointed out for a ship in severe following and quartering seas by using the aid of numerical simulation program. The effect of several parameters on the critical situation is discussed to investigate the possible causes of capsizing. In addition, Froude-Krylov forces acting on a ship with large amplitude displacement are evaluated in the practical formulas to make simulation program simple.