| The shallow water ship-ship interaction is crucial for the safe navigation of ships and has become one of the factors limiting the further growth of port throughput.The existing mathematical model of ship motion in the nautical simulator is relatively simplified considering the influence of shallow water ship-ship interaction,and the scope of application is limited,which seriously affects the accuracy and versatility of the nautical simulator.This thesis takes the shallow water ship-ship interaction as the research object,aiming to break through the technical bottleneck of the industry and improve the calculation accuracy of the mathematical model of ship maneuvering motion.Firstly,based on the STAR-CCM+ calculation software,the interconnection coupling characteristics between the influencing factors such as ship spacing,ship speed,ship size,water depth,and current are deeply analyzed,and the ship-ship interaction force and moment of the two ships under different cross-distances,different speeds,different water depths and different ship scales are numerically calculated,and then the influence mechanism of each influencing factor on the three sailing conditions of the ship(encountering,chasing and passing the moored vessel)is discussed,and the offline database of ship-ship interaction force and turning bow moment is established.Then,the mechanism modeling method is adopted,the dynamic coupling mechanism between "ship-oar-rudder" is comprehensively considered,and the three-degree-of-freedom motion equation of ships considering the ship-ship interaction in shallow water is constructed,and the modeling idea of "offline calculation-online interpolation" is used to break through the problem of large solving amount and slow solution speed of hydrodynamic calculation of the ship-ship interaction,and realize the rapid real-time solution of the ship motion simulation model.Finally,based on MFC programming language,a ship motion simulation test platform is built,and the motion modeling and simulation of shallow water ship-ship interaction is carried out for KCS container and DTMB5415 ship.Through the simulation results,the trend and law of ship-ship interaction changing with water depth,longitudinal distance between two ships,transverse distance,relative speed and the size of different ships are analyzed,which is basically consistent with the trend in literature and the law in actual navigation practice,and the simulation results are good,which verifies the rationality of the mathematical model of shipship interaction in shallow water.Through the research of this thesis,it provides quantitative and qualitative guidance and suggestions for ship drivers to safely drive in shallow water congested channels,and conducts in-depth research on the shortcomings of the mathematical model of ship maneuvering motion of the navigation simulator,which improves the performance of the navigation simulator,which is of great significance for improving the quality of the navigation simulator and ensuring the safety of the ship. |
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