Abstract
Zero-speed fin stabilizer is applied to reduce the roll motion of ships at zero speed. This paper aims to explore the control strategy of zero-speed fin stabilizer through a composite method of theoretical analysis, simulations and tank tests. The hydrodynamic force model is established using analytical approach and a simplified model is obtained by fitting the CFD simulation data. The control strategy of zero-speed fin stabilizer is obtained based on disturbance and compensation by analyzing the phase matching relationship between the wave disturbance, the roll motion of the ship, the movement of the fin and the fin-induced hydrodynamic force. Simulations and water tank tests are performed to verify the effectiveness and feasibility of the obtained control strategies. The results of simulations and tank tests show that the obtained control strategies of zero-speed fin stabilizer based on disturbance and compensation are effective and practical. The proposed method provides theoretical and experimental support for engineering application, and can also be a reference for the controller design of zero-speed fin stabilizers.
Highlights
A ship in a seaway moves in six degrees of freedom (6-DOF) under the interference of sea winds, waves and currents
Large roll motion may lead to cargo damage, on-board operation interruption and even ship capsizing [1, 2]
2.3 Hydrodynamic force model fitting. It can be seen from Eq (23) that the hydrodynamic force generated on the zero-speed fin stabilizer mainly depends on the angular velocity and acceleration of the fin, which is much different from the conventional lift-based fin stabilizer
Summary
A ship in a seaway moves in six degrees of freedom (6-DOF) under the interference of sea winds, waves and currents. The new system significantly reduced the roll motion of the ship at zero speed and its antirolling effect under speed condition is satisfactory [18, 19] Another zero-speed anti-rolling system based on the Weis-Fogh mechanism was proposed by the Institute of Ship Stabilization and Control Research of Harbin Engineering University in 2005 [20, 21]. The control strategy is obtained based on disturbance and compensation by analyzing the phase matching of the wave disturbance, the roll motion of the ship, the movement of the fin and the fin-induced hydrodynamic force.
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