Study On The Slewing Motion Of A Single Point Mooring Ship In Current

It is well known that at the single point mooring or anchoring the slewing motion of a ship is caused by action of the wind or the current. For a single point mooring ship in current, a new mathematical model is proposed to describe the current forces acting on a ship under the slewing motion. Through calculating the anchor force and analyzing the change of the tension of mooring lines, this paper analysis the anti-slewing effect by using propeller and rudder and provide a safe anchoring method for officers.In view of those, this paper adopts MMG modeling ideas and provides a math model which connected with Yoshimura model, an integrated shallow water and low speed mathematical model for simulating ship slewing motion is presented in this paper, and lateral force is added to this mathematical model as well. The paper applied the 4-ode Runge-Kutta method to calculate the equation of maneuvering mathematical model.The ship maneuvering simulation researches are carried out by use of the MATLAB's Simulink Toolbox in this paper. Simulation results verified that the method proposed in this paper is feasible, because with which we can evaluate various effects of changing the mooring conditions such as current speed , ship's displacement, the length of mooring line, etc. on the slewing motion with ease and with accuracy. The research provides with the reference for the navigational officers on safe anchoring.