Development of Improving System for Rolling and Maneuverability of a Displacement-Type Super High Speed Container Ship

近年来，超高速大型集装箱船正在计划中。在这些船舶中，横向稳定性被认为是弱的，从而将干扰这些船舶的性能。因此，提高高速排水型船舶的横稳性具有重要意义。同时横摇或横倾机动也是不可忽视的，因此必须结合船舶的机动特性来考虑。本文提出了三种减摇系统，并通过数值和物理仿真验证了它们的可行性。一种是垂直下伸的中心鳍，另一种是垂直上伸的空气鳍，第三种是回转控制系统。为了同时提高船舶的操纵性，对船舶纵荡、横摇、横摇和横摇四个自由度的运动方程进行了处理，在回转控制系统中，对小重量进行垂向控制，改变船舶的横向转动惯量。当然，该系统改变了船舶重心的垂直位置，因此必须避免参数振荡。结果表明，这三种系统是改善船舶波浪横摇特性的有效系统。

In recent years, super high speed large container ships are planned. In those ships, the transverse stability is considered to be weak, so that will disturb the performance of those ships. For this reason, the improvement of transverse stability is important for high speed displacement-type ship. In the same time list or heel by maneuver cannot be ignored, so this problem must be treated relating maneuvering characteristics simultaneously.In this research, we proposed three anti-rolling systems and confirmed their feasibility by carried out numerical and physical simulations. One is downward vertical center fin, second is vertical upward air fin and the third is gyradius controlling system. For improvement of maneuverability simultaneously, we treated equation of motion with four degrees of freedom, namely surge, sway, yaw and roll.In gyradius control system, small weight is controlled vertically, changing the transverse moment of inertia of the ship. Of course, this system changes the vertical position of the center of gravity of the ship , so the parametric oscillation must be avoided. As conclusion, those three systems were proved to be efficient system for improving rolling characteristics in waves.