Study On Optimization And Maneuverability Of Rudder On High-speed-ship

Ship can sail under the determination of the sailor,depending on the move of the rudder at the back of the ship.When moving the rudder leaf,changing its position,the pressure of the water can make the ship turn,and the course changed. The change of the rudder section parameters will affect its hydrodynamic characteristic,so as to achieve the aim of controlling the ship's maneuverability. Rudder became one of the most common used manipulate facilities by its advantages of simply structure,reliable operation,low cost and so on.First,it equip several rudders of different section on one known high speed ship,simulate these combinations and qualitatively study on the rotation, beeline stability and course alteration.By simulation the conclusion can be drawn: rudder of NACA section have good controlling on the high speed ship, maneuverability indexes are all better than other rudders',so rudder of NACA section is suitable to the high speed ship.Second,on the condition that the rudder section is chosen,the better one from the point of rudder parameters is choosen.It choose three types of parent rudder,fix two types of thickness ratio,and then simulate on different values of aspect ratio.By comparing the curves of lift coefficient and fluid dynamic coefficient it educe the optimal values of aspect ratio and thickness ratio.Last,according to the existing mature ship controlling equation and empirical formula to compute the ship's hydrodynamic coefficient,the software which can be used to design the ship's rudder at the preliminary stage is made. The simulation demonstrated that the rudder's parameters were well chosen at the course of design.It can reduce the workload when using this software,and the result is comparatively accurate.