INVESTIGATION OF CONTROL OF ELECTROHYDRAULIC SERVO DRIVE UNITS

摘要

In the paper the main properties of electrohydraulic servo drives and their theoretical model is shown. The electrohydraulic most important nonlinearities are discussed. The results of made out at Poznan University of Technology investigations dealing with improvement of PID control are presented. The electrohydraulic servo drive nonlinear control possibilities are showe. A special attention to the usage of neural network and fuzzy logic in nonlinear control was given. In the paper the main works directions in this area, which are taken at PUT are presented. They are affected with: formation of servo drives, which are able to move with low velocities and obtain high accuracy, usage of MR fluids and modern control techniques applications. The possibilities of electrohydraulic servo drive units properties improvement by the usage of magnetorheological fluid are also presented.