| The rocket launcher is a powerful blow, accurate, flexible multiple mounted army weapon. Dynamic mechanism of rocket launcher includes two parts, one is direction machine that is transverse tube swing and one of important parts of the steering function controlled by hydraulic system, another is elevating mechanism that is mainly adjusting the vertical pipe of the swing. However, there will be some shortcomings in the laboratory direction machine of hydraulic system during initial design, which make the system steady-state error more obvious. To make the rocket can be precise and flexible, hydraulic correction system is very important. Conventional PID control is based on a certain set of rules, which can’t achieve the desired control effect for the complexity of the control system. Fuzzy control has the characteristics of strong adaptability and high accuracy. If fuzzy control can combine with the advantages of convenient and flexible use of the conventional PID control, that will achieve a good control effect.First, this paper analyzes the application of hydraulic control in control technology. On the design principle, the kinematics and dynamics of the laboratory rocket direction machine is analyzed. According to the load matching principle, it can get the best matching result, select some key parts of system, and make a preliminary overall plan.Second, establish the mathematical model of valve controlling cylinder in hydraulic system. The system transfer function is set up and simplify by deducing the load flow equation, flow continuity equation of the model and load dynamics equations of valve-cylinder model. The stability of the system is analyzed by using MATLAB software to plot Bode diagram and unit response model of system. For the problems existing in the system, correction link is introduced with having conventional PID control, but the performance of the system still needs to be further improved.Finally, combine the characteristics of high precision, strong adaptability of fuzzy control with the advantages of flexible and reliable of PID control by using the principle of fuzzy control. The fuzzy PID control model of hydraulic system of hydraulic system is built on Simulink platform in MATLAB. The simulation results show that compared with conventional PID control, the performance of the fuzzy PID control is obviously improved in the system overshoot, oscillation frequency and adjusting time. Fuzzy PID control can make the controlled object have good steady state performance, which is a kind of control strategy with great application value. |
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