Abstract

Electro-hydraulic servo-drives are used advantageously in manufacturing industry because of their great actuating power. The characteristic weak damping of such drives, however, complicates the design of an appropriate control considerably. This paper describes an investigation of the design of linear feedback controls for servo-valve-controlled hydraulic drives. Multiloop controls as well as state feedback controls are tested by means of a nonlinear model of a hydraulic drive and the results of a hybrid simulation study are presented. The aim of the investigations was to explore the dynamic behaviour of state feedback controls and to compare the results with those of conventional cascade feedback controls.

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