| In order to ensure the safe and effective development of offshore engineering operations,it is necessary to accurately predict the movement of marine engineering vessels.In view of the large number of ship’s hydrodynamic derivatives in motion prediction,reasonable trade-offs in mathematical modeling of ship motion can complete ship motion prediction more accurately and quickly.Therefore,this paper takes China’s first multi-functional deep-water engineering offshore oil 286 ship with a working depth of 3,000 meters as the research object to study the six-degree-of-freedom hydrodynamic characteristics of the ship This paper conducts the following research workBased on the vectorized modeling idea,a kinematics dynamics mathematical model suitable for the offshore oil 286 ship operating conditions was established.The hydrodynamic effect of the six-degree-of-freedom coupling speed was considered in the modeling process,so that the mathematical model can meet the motion prediction.accuracy.Based on the motion and geometric characteristics of the Offshore Oil 286 ship,a restraint model test was designed.The hydrodynamic characteristics of the Offshore Oil 286 ship were studied to obtain most of the hydrodynamic coefficients.At the same time,the hydrodynamic force combining the restraint model test and CFD technology was used.The research method,the numerical simulation of the spiral arm test is designed,and the third-order coupled hydrodynamic coefficient is solved.Based on the mathematical model of six-degree-of-freedom motion proposed in this paper,the gyration motion prediction of the offshore oil 286 ship is carried out.Based on the changes of gyration parameters and motion state variables of the three-degree-of-freedom and six-degree-of-freedom motion prediction,the six-degree-of-freedom mathematical model Advantage.At the same time,a sensitivity analysis based on the indirect method was performed on the viscous hydrodynamic coefficient based on the state variables of slewing motion,and the status of coupled hydrodynamic parameters in ship motion prediction was discussed. |
