Study On Modling And The Control Method Of Hydraulic AGC System To Universal Rail And H-Beam Mill

Mill hydraulic Automatic Gauge Control (AGC) system is modern mill general kernel technology.Universal Rail and H-Beam Mill is the typical model of modern electro-hydraulic and mechanical systems. Research on its precise mathematic model is the precondition of system analyzing, designing and optiming control. Based on the HAGC system of the Universal Rail and H-Beam Mill, cooperated with modeling by mechanism combining the enterprise′s actual project, this paper at first introduces the new technique, specialties of Universal Rail and H-Beam Mill, considering such factors as deformation and eccentricity of roller, the initial range of hydraulic cylinder, the plastic deformation of the precision and input gauge, as well as their efforts on the thickness accuracy, dynamic performances of hydraulic control system, according to the flow equation of servo valve, the flow continuity equation of hydraulic cylinder, the force balanced equation of hydraulic cylinder with load, then deduces the ideal mathematical model of electric-hydraulic position control system, which reflecting the project tuely and completely. The simulation results that the steady control effect has been achieved in hydraulic AGC system by the language of MATLAB to the transfer function of the electric-hydraulic position control system.According to the mathematical model of electric-hydraulic position control system, the PID controller is applied, and steady control effect has been achieved in hydraulic AGC system. Because of the property of fast response, high control precision and high anti-interference of the hydraulic AGC system is needed to the hydraulic servo system, and it is difficult for the system to solve the problem that is caused by the parameters variety, outside disturbance and the friction nonlinear dead zone of the servo valve. It is well known that it is not necessary to get an accurate model of the system for fuzzy control. So the fuzzy adaptive controller is proposed by the research which fuzzy control and PID control are applied to control the hydraulic servo system and the paper does many simulation of the fuzzy adaptive PID controller by the language of MATLAB. The simulation results present the good dynamic characteristic of the control method. This method has robustness and fast response ability and steady state precision. These findings above can certainly provide the theory meaning for optimal control of the system, they can also provide the theory foundation for on-the-spot practical application.