Simulation And Study On The Anchoring Bias Swing And Dragging Of A Single Point Ship Mooring In Wind

It is well known that the ship yawing at anchor is the main reason that it causes anchoring vessels to drag,and the consequences may result in collision and aground and so on. Anchoring boats generate yawing weakly only in uniform flow that flow velocity is rather weaker,and so is in the waves and surges. Consequently the strong wind is the main reason that causes anchoring vessels to yaw. So it is extremely important to study the regulations of anchoring vessels yawing movement. Since the 1960s, many domestic and foreign scholars have conducted experimental analysis and theoretical research in different perspectives and depths, which has been laid a good foundation for us. Nevertheless, the accidents sometimes occur due to anchoring vessels yawing in recent years. So further study on the bias swinging and dragging regulations in the strong wind provides references for the safety of anchoring and has practical significance.This paper adopts MMG modeling ideas. Several of the frequently used low-speed domain, large drift angle hydrodynamic model simulation results were compared. It 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. Using MATLAB language, this paper developed simulation platform for motion control and adopted a four-order Runge-Kutta method to calculate the manipulation of equations of motion of the ship's side mooring swing movement of the simulation, the simulation results and experimental results have shown that the model is reasonable. Analysis and comparison of the simulation results obtained in different wind speed, a chain of different length, set different conditions, different ship types and different attitude on the single anchor trim partial swing motion of the ship. On basis of anchor bias swing, this paper also established a dragging mathematical model to study the ship's movement after taking attitude anchor.The study of this topic explored the establishment of ship dragging mathematical model during anchoring bias swinging in the wind and provides a reference of exercise for the future establishment of ship dragging mathematical model. The results of study provides a reference for drivers to take measures to ensure the safety of ships at anchor in strong winds and take the appropriate measures after the anchor is dragging.