High Sensitivity Synchronization Motion Control for an Aero-Engine Dual-Cylinder Hydraulic System

It is well known that most position synchronization control schemes merely relay on position error dynamics, which are hard to fully explore the potential capability of synchronized plants. Therefore, this paper studies the synchronization motion control using both the position and velocity states for the dual-cylinder hydraulic system. This indicates that more states are involved in the synchronization regulation, which thus provides the ability of enhancing synchronous performance. Meanwhile, a novel fast finite-time observation approach is proposed and designed for each actuator to compensate the uncertainties of forces and flow rates, and eliminate the load variation caused by different loads and disturbances of two actuators. The proposed observer converges faster than traditional ones with exponential or asymptotic rates benefiting from the homogeneity technique. It is also proved that the proposed control scheme can ensure both synchronizing and tracking errors to exponentially converge to an adjustable compact set or zero when the system is only subject to constant disturbances. Finally, experiments on the aero-engine Hardware-in-the-loop (HIL) platform with hydraulic actuators are conducted to verify the effectiveness and practicability of the proposed synchronization control scheme.