| With the development of modern military, shipborne weapons have become one of important means to protect ships and combat enemies. The solution combines classical PID law with analogue electronic system is now a mature technology, this paper analysis this technology in theory and experimentation, the result argues that this technology is feasible, but on the other hand the classical PID law is not so good in precision, response speed, disturbance rejection and the analogue electronic system is big, costly and frequently in failure. So the choice of advanced control law and digital control is now the main fashion. Under the background this paper is researching the digital control method base on the Genetic Algorithm PID law (GA PID).GA is a model to simulate the process of biological evolution. It is a new search algorithm of global optimization. Its main advantages are as follows: First in the case of not given the initial parameters, Genetic Algorithm is also able to find suitable parameters. It makes the control objectives meet the goal of controlling demand. Second it can achieve optimization through simple reproduction, crossover and mutation of string. And it is operating in parallel from many points starting. It searches for the solution space in efficient heuristic. So it is easy and fast. The experiment indicates that this method get a big improvement in the precision, speed and disturbance rejection.The software and hardware of digital platform stabilization loop is designed. The digital controller and hardware interface and theory of its external circuit are emphasized in hardware design section. PWM wave producing module closely related chip structure is emphasized in software design section. In this paper TMS320F2812, a product of Texas Instruments Inc., is chosen as the core chip of the digital control system. Because DSP2812 has the advantage in efficiency, speed and precision, it can produce 12 PWM output channels. It makes the motor control more convenient. |
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