Research On Modeling And Simulation Of High-speed Ship CPP Propulsion System

Nowadays, there are various sorts of high-speed ship and newly different ship shapes appear endlessly. In order to achieve the goal of high-speedy and high-efficient, many different shapes of high-speed ship obtain characteristics listed below: The first one is that they are sensitive to weight, another one is that steady and non-steady force supported by their structure are stronger than other ordinary ships. Obviously, these characteristics of high-speedy ship result in that they are sensitive to changes of navigation state. When actual navigation state is not matching with the design state, result in that the matching of among ship, engine and propeller keeps away from optimal one, and phenomenona of "light propeller" or "heavy propeller" appear consequentially. Thus it can be seen, to match propeller with main engine reasonably, we not only need to take full advantage of engine's power, but also make engine's power can't go beyond the allowable range in the working state, then achieving a goal of optimal match among ship, engine and propeller and attaining high- efficient power capability, economy capability, reliability and longer useful time. To these above-mentioned problems, there are nothing we use fixed pitch propeller, but can use CPP(Controllable Pitch Propeller) to resolve fundamentally these problems of non-matching for engine and propeller.This article mainly confers the issues on modeling, control algorithm and optimization method of high-speed ship CPP propeller system. Firstly, based on the characteristics of high-speed ship, math models of ship - propeller subsystem, diesel engine subsystem, load control subsystem, pitch control subsystem, optimization control target function, etc. have been established. While, based on MATLAB/ SIMULINK, the whole propeller system's figure simulation models and high-speed ship CPP propeller system's optimization control target models have been established. After that, rotate speed control model and pitch control model of high-speed ship CPP propeller system based on fuzzy algorithm have been written down on MATLAB/SIMULINK. As well as the optimization control target program codes of high-speed ship CPP propeller system based on GA (Genetic Algorithm) have been written down on MATLAB6.5. Finally, CPP propeller system of the frigate has been simulated and researched, using fuzzy-PID control algorithm and traditional PID control algorithm. And the simulation results have been analyzed and compared each other.The result of simulation indicates, the effect of fuzzy-PID control algorithm is better than one of traditional PID control algorithm. Fuzzy-PID controller can adjust main engine's load, and conveniently changed pitch angle by adjusting CPP's pitch. Accordingly, to improve the efficiency of main engine's propeller and the ship's operation capability in different navigating states, and to achieve the optimal match among ship, engine and propeller, to prolong main engine's age, and to reduce the cost of working.