Roll Damping of High Speed Slender Vessels

Abstract

The roll damping plays a very important role for large amplitude roll motion in resonance, and the lack of the damping sometimes causes capsizing of a ship. Since the viscous damping components are usually dominant in the roll damping, the theoretical calculation is difficult for predicting it. One of the authors proposed a prediction method of the roll damping of a conventional cargo ship, and the method is widely used. In the present paper, some problems which occur when the prediction method of the roll damping of a conventional cargo ship is applied to a high speed slender vessel are experimentally revealed, and some modifications of the method to improve the accuracy are proposed.