Design And Control Research Of Anti-rolling Device Based On Magnus Effect

Magnus rotating roll stabilizer is a novel ship roll stabilizer which has good anti-rolling effect in low speed and even in zero speed. Compare to other conventional stabilization device, Magnus rotating roll stabilizer has many advantages such as low volume, light weight,simple structure, easy installation, and lower drive power, which make it have good application foreground in ship roll stabilization. Up to now, only few foreign companies applied it into practice, while there are few domestic studies. Therefore, an in-depth study of the hydrodynamic characteristics,structure design and control method of Magnus rotating roll stabilizer. The main content of this paper include:Firstly, Compare Magnus rotating roll stabilizer with other conventional stabilization device in anti-rolling method and anti-rolling effect. The development of Magnus rotating roll stabilizer at abroad are summarized. Magnus effect is analyzed in detail. The lifting mechanism of Magnus effect is deduced and analyzed.Secondly, the computational fluid dynamics software (CFD) was used here to get the hydrodynamic characteristics of Magnus rotating roll stabilizer. The influences of Reynold Number, rotating speed, ship speed, spin ratio on lift/drag, lift /drag coefficients and lift-drag ratio is analyzed in detail. The effect of rotating speed of Magnus rotating roll stabilizer on lift is analyzed emphatically in certain ship speed. The mathematical model of ship’s rolling motion is established by analyzing the forces acting on ship. And the disturbance model of wave can be got through the superposition of the disturbance force and moment from unit amplitude of regular wave. The servo system of Magnus rotating roll stabilizer is designed.Finally, the parameters of Magnus rotating roll stabilizer can be got based on the given hull parameters of target ship. The principle of Magnus rotating roll stabilizer system and the structure and composition of each part are analyzed. The parameters of servo system were got by computation and analysis. The control characteristic of servo system is analyzed and the correction work is done to get desired control effect. The stabilization system mathematical model of Magnus rotating roll stabilizer system is established in Matlab\Simulink. The PID controller of this stabilization system is designed. The simulation results of Magnus rotating roll stabilizer in different sea state, ship speed and encounter angle is given. The simulation results show that Magnus rotating roll stabilizer has great anti-rolling effect in low speed.