| The ship will be subjected to be oscillated with six degrees of freedom when it ismoving on the sea surface by the wind, waves and current. The ship sea-keepingperformance and safety are affected by the ship severe motion. The ship motion control isthe important research project for ship designers. In the recent year, ship active oscillatingmotion reduction is the new topics. The ship motion reduction fin is a commonly used motion reductiondevice with high efficiency. In the present work a anti-oscillating fin are designed for a high speed ship.Two control strategies for the anti-oscillating fin are provided and the efficiency of the motionreduction is also shown in the present research. At the first, this paper gives the review of thedevelopment of ship anti-oscillating fin technology and motion control strategies. The ship potentialtheory, strip theory and the six degrees of freedom motion equation are introduced in the article. A deepV high speed ferry ship hull form is selected as a numerical example. Based on the source distributionmethod of strip theory by Frank the added mass and damping coefficients are computed in the presentpaper. The computed results have been compared with the related results for the high speed ferry shiphull form. By using the hydrodynamic force and wave force from deep V high speed ferry, thelongitudinal anti-oscillating fins are introduced for the ship. Two motion control strategies arepresented in the paper. The longitudinal motion computations are carried out for the ship with orwithout the anti-oscillating devices. The detail numerical results are presented, ship motions areanalyzed and the results are compared by using two control strategies separately.The paper uses MATLAB to obtain the heave and pitch motion response of ship with activecontrol stabilizing fins and studies the motion reduction effect of the control method which is given inthe paper. Taking a depth V fast ferry as a numerical example, the detail results are obtained. |
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