Control model and parameter identification of asymmetric hydraulic cylinder servo pump control system
                                              XU Kun1,2, ZHU Denglin1,2, MEI Zhiqian1,2, CHEN Cheng1,2
(1.College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213000, China;2.Changzhou Key Laboratory of Special Robots and Intelligent Technology, Changzhou 213000, China)

Abstract: Aiming at the problem of control modeling and parameter identification of asymmetric hydraulic cylinder servo direct drive pump control system, modeling of servo motor and pumpcontrolled asymmetric hydraulic cylinder system were derived by theoretical analysis, and the model structure and order of transfer function was obtained. The transfer function method for measuring amplitudefrequency characteristics in traditional control theory was described. A method of accurately solving system transfer function was proposed, which combines theoretical modeling with system identification modeling. The amplitudefrequency characteristics of servo motor and pumpcontrolled asymmetric hydraulic cylinder system were experimented respectively. The parameters and transfer functions of the control model of the asymmetric hydraulic cylinder servo pump control system were obtained by using the above method. The experimental results show that the method can be used to solve the transfer function of the system, and has certain practical significance. Above reasearches give a good foundation for precise control of press servo direct drive pump control system.

Key words: hydraulic servo pump control technology; transfer function; parameter identification; amplitudefrequency characteristics