Design and control of hydraulic system for ultra high pressure stress plasticizing forming equipment
Aiming at the requirement of pressure and position control accuracy of ultra high pressure stress plasticizing forming technolo-gy,a hydraulic system of ultra high pressure stress plasticizing forming equipment was designed,and the mathematical model of pump control cylinder of the hydraulic system and the electromechanical hydraulic simulation model of AMESim were established.The fuzzy PID control and third-order active disturbance rejection control strategies were introduced respectively to solve the problems of large speed fluc-tuation and poor pressure control effect of hydraulic cylinder.The co-simulation of AMESim and Simulink verifies the effectiveness of the two control strategies.The simulation results show that the fuzzy PID controller has a good tracking effect on the trapezoidal speed curve,and the tracking error of the hydraulic cylinder speed is less than 0.0035 m·s-1,which obviously eliminates the fluctuation of the hy-draulic cylinder speed.The active disturbance rejection controller improves the precision of pressure control,and the pressure error in the pressure curve tracking phase is less than 0.05 MPa.The dynamic adjustment ability of the whole system is enhanced,and the precision of position and pressure control is significantly improved.
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