Extension Control Strategy And Experiment Study On Electro-Hydraulic Servo Systems

In recent years, electro-hydraulic servo system has widely been applied to aviation, spaceflight, shipping and metallurgy fields etc. The adaptability of the system is not very good, because the maths model of the typical electro-hydraulic servo system is always the linear model gained from small error theory. The intelligent control that is based on knowledge and not reliant to the precise maths model gives new ideas for solving these problems. Extension control which is based on matter element and extenics is a new branch of the artificial intelligent control. Extenics aims at researching the inconsistent problems of the objective world. It brings forward the basic idea on transforming inconsistency to consistency. This paper, based on this idea and integrating related literature and information, applies extension theories and methods to control field and brings forward the arithmetic of extension control to control electro-hydraulic servo system.The following will introduce the main work finished:After looking up a lot of bookings and papers about extenics, I apply the theories of extenics to control field and research the arithmetic of extension control. Implementation of the upper extension controller and improvement of the control algorithm in the basic controller are developed. Results of simulation and experiment on the physical simulation model built in laboratory show that the extension control is of good performance and prove that the extension control is feasible and superior in the electro-hydraulic servo system.The mathematical model of electro-hydraulic servo system is given. The simulation structure of control system with double closed loops is built. The Simulink structure of electro-hydraulic servo system is built. Making use of different control methods, a series of performance contrast simulation experiments are conducted. The computer control of electro-hydraulic servo system is realized by using LabVIEW6i. Making use of extension control and PID control, many experiments are conducted on the physical simulation model in the laboratory. Results of simulation and experiment prove that after we use the composite control method, unit roller can evite the step faster and more placidly.