Dynamic Simulation Investigation Of Steering Gear System Of Ship Based On Personal Computer

With the rapid development of information technology and the wide use of computer, the application of Computer Simulation is increasingly popular. The engine room simulator is one of the typical examples of Computer Simulation in the field of navigation, and has become an important way to train and examine most sailors. The engine room simulator mainly simulates the performance of the main propulsion, engine room, ship power station and so on. Part contents are about the steering gear system simulation in engine room simulator. Therefore, it is essential to carry research on the modeling and the simulation to the steering gear system. It is also necessarily to build software about the steering gear system for student's practice and evaluation.The simulations object in this paper is the fork type rudder hydraulic actuator of theship "LIANYUNHU" belonging to the Dalian Ocean Shipping Company. According toits characteristics of structure, work process and the requirements of operation, theturning theory of actuator and hydraulic system are analyzed. Then using the methodof modular modeling and lumped parameter modeling, the author establishes thedynamic math model of steering gear system. In addition, in order to build the mathmodel of autopilot and based on the MMG ship motion model, the mathematicalmodel of the linear equation of the ship maneuvering motion is established.On the basis of established dynamic math model, the author establishes the simulation model of steering gear system applying the tool of Matlab/Simulink and introduces the method and process of building real-time simulation model for each sub-module detail. Through setting reasonable simulation parameters and algorithm, the author carries the real-time simulation experiment on the computer. The result indicates that each dynamic process conforms to dynamic response process of the ship steering gear system. Compared with demand of speed of rudder movement in SOLAS regulation, the mathematical model of steering gear is right and effective. In addition, according to the result of "turning circle" operation and "Z" operation, the mathematical model of ship motion is right and appropriate.At last, the author has designed a real-time simulation system of steering gear system based on the correct math model and appropriate simulation result in Matlab, proposed the designing thought and method of the whole simulation system and introduced the software's structure and function of each part. Using the programming language Visual C#, the author has completed the design of the software about the steering gear system. This software is composed of man-machine conversation interface,simulation model and database. The man-machine conversation is all right and it is used to display the real time datum and the process of operation. The model is used to simulate the actual system of rudder and calculate the datum for the interface. When the interface is operating, the model will respond. The database is used to note the datum and the operations. The user can check the datum and operations expediently.