Study On The Control Of Electro-hydraulic Servo Feeding System Of CNC Spinning Machine

Compared with other control systems,electro-hydraulic servo control system has the advantages of higher precision and larger output power,it is widely used in industrial automation.In recent years,electro-hydraulic servo system is becoming more and more complex,the influence of its nonlinear,parameter uncertainty and interference can not be neglected any more.The classical PID controller gradually can not meet the demand,more and more people commit themselves to the research of new control strategies.In this paper,the electro-hydraulic position servo control system of W81 K spinning machine was treated as research object,then validated the control effect of parameter self-tuning fuzzy PID controller and sliding mode variable structure controller by carrying out simulation.The main parameter of electro-hydraulic position servo control system of feeding system was caculated and the transfer function was reducted.Then fuzzy PID controller was designed in simulink which used the error and the change rate of error as input parameters and exported the modifying factor to regulation the three parameters of PID controller.Then the simulation of fuzzy PID controller was carried out.The simulation results showed that the control effect of fuzzy PID controller is better than PID controller.After the simulation of fuzzy PID controller,the transfer function model of spinning wheel seat servo feeding system was converted into state space equation and the simulation of sliding mode variable structure controller control the servo feeding system of spinning machine wheel seat wass carried out in simulink.Firstly,the proper sliding mode switching plane and reaching law was defined and the control law of sliding mode controller was acquired.Then the simulation of external disturbances and non-disturbances was respectively carried out in simulink.By comparing with PID controller's control effect on spinning wheel seat servo feed system,the simulation results shows that sliding mode controller has better robustness and can improve the control precision to a large extent.At last,the physical model of spinning wheel seat servo feeding system is modeled in AMESim and sliding mode controller was chosen to used in cosimulationby comparing the control effect of fuzzy PID controller and sliding mode controller in simulink.Then sliding mode controller in simulink was used to control the physical mode in AMESim.And the practicability of using sliding mode controller to control the spinning wheel seat servo feed system was certified in theory.This paper mainly researchs the control of using fuzzy PID control and sliding mode control strategies on spinning wheel seat servo feed system by using computer simulation,and the electro-hydraulic position servo control system of W81 K spinning machine is treated as research object.This offers guidance for the application of sliding mode control stragedy,which has very significant meanings.