5. On the Coupled Motion of Steering and Rolling of a High-speed Container Ship

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概要

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• Yaw-sway-roll coupling motion of a ship is investigated on the basis of captive model tank tests. A single-screw, high-speed container ship has been chosen as a typical type for the study. The smaller metacentric height naturally results in the heavier coupling of roll into yaw and sway, which affects manoeuvrability significantly : turning performance is improved by the coupling effect, and course-stability and quick response to steering are reduced. In short, the roll coupling lessens the hydrodynamic damping to yaw and sway acting upon the hull. When an automatic course-keeping device is introduced, as is quite popular in modern navigation, another element of coupling is added: the rudder is activated in accordance with the yaw motion. This yaw-sway-roll-rudder coupling can become the cause of the heavy rolling' often experienced on high-speed ships automatically steered in a seaway. We make use of a perturbation stability analysis of the problem to reveal the mechanics of the unstable character of the coupled motion of a ship. Introducing rate-control to the autopilot gives a remarkable stabilizing effect.

• 社団法人日本船舶海洋工学会の論文

著者

• Son Kyoung-ho

  University Of Osaka Graduate School Dept. Of Naval Architecture

• Nomoto Kensaku

  University Of Osaka Dept. Of Naval Architecture

関連論文

• 5. On the Coupled Motion of Steering and Rolling of a High-speed Container Ship

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