The Research And Implementation Of The Semi-physical Simulation Of Marine Propulsion System And Its Control System

As an important part of the marine economy,the development of the shipping industry is inseparable from the cultivation of the comprehensive quality and knowledge and skills of the crew.The marine engine simulator has many advantages,such as its economic efficiency and many other advantages.It has an unparalleled advantage in crew training,such as learning professional knowledge on ships,or dealing with unexpected accidents.It has great significance for ship navigation safety and crew safety.The traditional way of data transmission of marine simulator is to transfer the data generated from the simulator directly to the interface,which is a simple way to transfer data to data,but different from the traditional way,the real physical signal generated by the ship,such as temperature and pressure,is convert through the sensor into electrical signals,so as to complete the follow-up control and monitoring work.In order to make the system more consistent with the actual working environment of the ship,this thesis joins the physical link on the basis of the traditional simulator.First of all,the thesis determines the overall design of the system,which is performing the semi-physical simulation of the propulsion system of the ship and its control system based on the actual sailing data and theory of the MAN B&W 6S35MC large low-speed two-stroke marine diesel engine.First of all,the mathematical simulation program is selected,the best simulation model parameters are selected by the real ship navigation data,empirical formula and thermodynamic equations,and the fault simulation part is designed and added.Then the data transmission mode suitable for this thesis is selected,and the mathematical simulation result is transmitted to the data acquisition module,and the effectiveness of the semi-physical simulation model is verified through the echo of the signal and then the construction of the overall environment is completed.Based on the overall design,every module of the system has been designed and implemented,including the use of quasi-steady-state method to simulate the diesel engine system,the use of volumetric method in the steady state of diesel engine in-cylinder process simulation,and propulsion control system simulation.The part of fault simulation simulates several common faults of diesel engine system,including host emergency control power failure alarm,premature failure of fuel injection and late failure of fuel injection,so as to validate the simulation model.In the data transmission mode,the model computer uses CAN(Controller Area Network)to complete the data transmission to computer,and the computer converts signals into 0-5V DC voltage,4-20mA DC current signals and digital signals which is commonly used in cabin sensors.The sensor signal is collected by CANopen-based data acquisition system which is commonly used on ships.The thesis finally verifies that the system function can meet the semi-physical simulation requirements of ship propulsion system and its control system.