| With the gradual recovery and development of the global economy,the demand for iron ore is increasing continuously and the trend of large-scale development of bulk carriers is obvious.400-thousand-ton super-large ore ship has been widely concerned,so its maneuverability has become an important subject.In order to further study the maneuverability of ULOC(Ultra Large Ore Carrier),this paper adopts MMG(Maneuvering Model Group)thought,collects the experimental data of large vessels both domestic and abroad and refers to literature of establishing model for large vessels,aiming to establish a mathematical model for ULOC of four degrees which are more complete and comprehensive including rolling.The paper utilizes MATLAB to simulate the turning cycle test under ballast condition and makes a contrast with the real ship's under different speed,different wind condition,verifying that the accuracy and rationality of the mathematical model is within the range of requirement.Based on the model established,this paper conducts the turning cycle simulation of different load conditions under different depth of water and different ship speed.This paper also carries out initial turning ability simulation and inertial stopping simulation.The simulation results show that ULOC has good turning ability and that both ship-speed-loss and heeling angle are obvious.The turning ability is better when the ship is under full load condition.ULOC has a good initial turning ability and the heading rate is better than ordinary ship.When ULOC sails on the shallow water,it has a significant shallow water effect on ship and ship's turning ability becomes worse,the area of turning cycle becomes larger.The simulation results also show that ULOC has long inertial stopping time and stopping distance and ship's stopping ability is poor.This paper can make a better understanding of ULOC maneuverability for ship officers and pilots,it can also provide guidance for practical ship handing. |
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