Input/output linearization control of an electro servo-hydraulic actuator

This paper presents a nonlinear control concept for servo-hydraulic actuators based on exact i/o-linearization techniques. Servo-hydraulic actuators have dominant nonlinearities due to the valve orifice flow characteristics. In most applications, they cannot be globally approximated by linear models over an extended working range. In this paper an input-output linearization technique, which exactly compensates the global nonlinearities of the system, is applied to a servo-hydraulic actuator and compared with a standard linear multi-sensor controller. The controlled actuator provides excellent transient and robustness behaviour shown in the simulation results