ADAPTIVE FUZZY GAIN SCHEDULING IN POSITION CONTROL OF SERVO HYDRAULIC SYSTEM WITH FLEXIBLE LOAD

摘要

The control of hydraulic servo-systems has been the focus of intense research over the past decades. Hydraulic position servos with an asymmetrical cylinder are commonly used in industry. These kinds of systems are nonlinear in nature and generally difficult to control. Because of changing system parameters using the same gains will cause overshoot or even loss of system stability. The highly non-linear behavior of these devices makes them idea subjects for applying different types of sophisticated controllers. This paper is concerned with a second order model reference adaptive position control of a flexible load servo-hydraulic system using a fuzzy gain scheduling. In present study, to compensate the lack of damping in hydraulic system, an acceleration feedback was used. The proposed controller was verified with a common used p-controller. The results suggest that using fuzzy controller improves all performance evaluation criteria such as stability, fast response, and accurate reference model tracking in hydraulic systems.