Modeling And Simulation Research Of The Electrode Lifting Hydaulic System Of The 5t Electro-sediment Cooker

In the process of ESR,it is the key problem of the technique that how to make the electricity,voltage,power change according to the require. The methods of controlling these parameters include changing electricity and changing the positiong of the electrode in the electro-sediment cooker. The foermer method of controlling electrode is DC and AC moter. However,with the widely using and the maturation,the controlling method of hydraulic is more and more better than mechanical method. In this thesis, an electro-hydraulic servo system has been designed which uses valve-controlled nonsymmetrical hydraulic cylinder as power. Because of it's high precision and response, this system can controlling these parameters during the ESR.On the basis of the research of development of the electro-hydraulic servo system and its power system, the valve-controlled nonsymmetrical hydraulic cylinder servo system meeting field demand is adopted. The valve-controlled nonsymmetrical hydraulic cylinder math model which differents from the general valve-controlled symmetrical hydraulic servo system model is rebuilt with deducting and solving parameters of the system. Based on the model, the PID control methods and MATLAB/Simulink are introduced, moreover, the simulation is accomplished. To overcome the limitation of general PID control appeared in the above analysis result, a new fuzzy auto-adapting algorithm is designed to improve the control effect of valve-controlled nonsymmetrical hydraulic cylinder.According to the operators'experience, fuzzy auto-adapting algorithm fuzz up the precision parameterss. Simulation results show that the valve-controlled nonsymmetrical hydraulic servo system based on fuzzy auto-adapting and PID complex controller can achieve better control effect in terms of adaptability and stability.