The Maneuvering Of Large Ship In Alongside Replenishment

Replenishment is the protection of combat effectiveness and viability of the fetus at sea, and many countries attached very great importance to it. It makes a important position in building a powerful navy. While the security of sailing and yaw controlling are the keys, so it becomes a research hotspot.Based on the separated modeling method, a maneuvering model of ship motions has been established. It contains force and moment of hull, rudder, and propeller. Hydrodynamic value which calculated by model Experiments are set to MMG equation. Runge-kutta method is used to calculate this equation. The receiving ship's numerical simulation of steady turning, Z-rudder-operating, variety of heeling angle and speed reduction were analyzed to accomplish ship maneuvering simulation. The simulation results show that the model can use as basic model in follow-up analysis.The hydrodynamic interactions between receiving ship and supply ship at different speed and different supply distance was considered. Besides that theory of elasticity was used to calculate the force of the receiving end of ropeways when replenished at sea. Through building up mathematical model, both safety research and minimum safe distance of receiving ship were analyzed in underway replenishment at sea, aiming to provide technical guidance for the best choice of separation distances, sailing speed and replenishment position. alongside replenishmentBased on the above analysis,used the classic PID control approach to calculate the K p, K d, K i coefficient and make fine adjustments, The interrelationship between rudder angle and yaw were obtained under tow Supply Status and four supply distances at 18kn. The result is that the classic PID control approach is available to control the yaw of the receiving ship when replenished at static sea.