Abstract: It is necessary to develop a mathematical model of fluid coupling when the steady-state & dynamic characteristics of marine propulsion system of CODOG configuration are carefully studied. According to physical law of fluid coupling’s operation, a general mathematical formula of output torque of fluid coupling is introduced from its working principle. Made use of test curves of fluid coupling’s torque provided by manufacture, numerical method is used to determine coefficients in the general mathematical formula for the output torque of fluid coupling. Neural network method is applied in order to extend test curves from several ones to the whole plane in first quadrant. A summary is given for the application of several methods to develop the mathematical model of fluid coupling for modeling and simulation.

Key words: Fluid coupling, Marine, Marine propulsion system, Mathematical model, Modeling, Power plant, Simulation