The Research And The Simulation On The Lift Of The Fin Stabilizer Under The Zero Speed

Now, the ship anti-roll systems mainly include fin stabilizer and anti-roll tank. The technology of the fin stabilizer and anti-roll tank becomes more perfect than before as time goes, because fin stabilizer and anti-roll tank respectively has its disadvantage and the require to reduce ship's roll is more and more strict, people keeps improving the anti-roll technologies to meet the demands.Among the new anti-roll technologies, zero-speed fin stabilizer system catches most people's eyes. Anti-roll tank system is the only choice for ship to reduce roll under zero speed, but the effect is not very good, it can only reach to 50% under all conditions. Fin stabilizer can reduce the most roll of the ship under high speed, but it hardly reduces the roll of the ship under low speed or zero speed. The ship which needs to reduce the roll under all kinds of ship speed has to mount two pair of anti-roll systems: fin stabilizer and anti-roll system to meet the need. The advantage is obvious, but it means that there are two systems to design and maintain. Two systems not only occupy more inner space of the ship but also increase the cost. If fin stabilizer can reduce the roll of the ship under low speed or zero speed, it means that there is only one pair of system to maintain and doesn't need more inner space of the ship. So it is important to research and analyze the lift which generates by the movement of the fin and build a lift model of the fin.This essay explains the working principle of the zero-speed fin stabilizer and analyzes the reason why the zero-speed fin stabilizer can supply the lift according to the foreign references. And difference working between the traditional fin stabilizer and the zero-speed fin stabilizer is given. According to Weis-Fogh mechanism's hydrodynamics, the lift model of the zero-speed fin stabilizer is built. Matlab is used to simulate the lift of the zero-speed fin stabilizer after some special parameters are supplied. The result indicates that the lift model is correct.