ADR algorithm applied in electro-hydraulic servo system

Abstract

Electro-hydraulic servo system due to its unique characteristics of fast response, wide range of speed, big load stiffness, strong resistance to electro-magnetic interference, large power output, light weight, etc. is applied in various industries. It is hard to build its accurate models due to nonlinear effects in order that conventional algorithms based on accurate models are ineffective to compensate disturbance. Hence, ADR (Active Disturbance Rejection) algorithm is adopted to further improve control precision of electro-hydraulic servo system, in which comprehensive disturbance instead of nonlinear effects was observed and compensated in real-time. Through simulation research by building system models with disturbance and comparing different simulation results, the parameters of ADR algorithm were tuned. Experiments with well tuned parameters of ADR algorithm were carried out to verify the validity of the algorithm on tri-axial electro-hydraulic compound flight simulator table middle-axis driven by electro-hydraulic servo system. Experimental results show that a high dynamic tracking performance is achieved based on ADR algorithm and robustness of ADR algorithm is strong. Thus, ADR algorithm can be used in practical control system.