Simulation research on intelligent control for propulsion system of large ship

In recent years, with the great progress in maritime transport, ships have increasingly tended to be more large and rapid. Thus, single engine and single-propeller large cannot meet the requirements of the various performances, multi-engine multi-propeller able to meet a variety of different sailing ship maneuvering characteristics of working conditions, and gradually adopted by the people. With the complicated of the propulsion requirements of the control system also will increase, large ship propulsion control systems have been paid more and more attention. The variability during the operation of the ship operating condition also increases the difficulty of controlling the propulsion system. It is an important problem to control the ship propulsion system in order to make the large ship keep speed being constant or changing quickly. In order to solve the problem, some work are carried out for a large ship with four engines and four propellers as an example in this paper. Firstly, a four degree of freedom motion mathematical model of large ship is established based on MMG method. Secondly, Steam turbine model, propeller model and sea environment model are established separately. Then, fuzzy theory is used to solve the propulsion system control problem, and a Fuzzy-PID controller for the ship propulsion system is designed. Finally, computer simulation with C++ program design is carried out to validate the modeling and control method. The simulation tests include the ship maneuvering motion in calm water and sea state four conditions. The simulation results show that the designed propulsion control system of large ship is perfect in performance.