Author(s)

N. El-Simillawy

Abstract

This paper describes the computational techniques used for representing the instantaneous under-water shape of the hull for a ship advancing at a constant speed with arbitrary heading angle in waves, taking into account the shape of the wave as well as the resultant ship motions in the six degrees. Such a method makes it possible to calculate the exact restoring forces and moments acting on the ship during the motion and, therefore, is applicable to the study of large amplitude motions. The effect of wave shape and fifth order gravity waves on the fluctuations of the lever arm and righting moment curves for the trawler GAUL, is presented and compared with those obtained in still water. 1 Introduction A complete analytica

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