Extended state observer-based motion synchronisation control for hybrid actuation system of large civil aircraft. Issue 10 (27th July 2017)

• Record Type: Journal Article
• Authors: Wang, Xingjian; Shi, Cun; Wang, Shaoping
• Is Part Of: International journal of systems science. Volume 48:Issue 10(2017)
• Page Start: 2212
• Page End: 2222
• Publication Date: 2017-07-27
• Subjects: Hybrid actuation system -- extended state observer -- motion synchronisation control -- hydraulic actuator -- electro-hydrostatic actuator; System analysis -- Periodicals; 003.3
• DOI: 10.1080/00207721.2017.1309592
• Languages: English
• ISSNs: 0020-7721

Abstract

ABSTRACT: Hybrid actuation system with dissimilar redundant actuators, which is composed of a hydraulic actuator (HA) and an electro-hydrostatic actuator (EHA), has been applied on modern civil aircraft to improve the reliability. However, the force fighting problem arises due to different dynamic performances between HA and EHA. This paper proposes an extended state observer (ESO)-based motion synchronisation control method. To cope with the problem of unavailability of the state signals, the well-designed ESO is utilised to observe the HA and EHA state variables which are unmeasured. In particular, the extended state of ESO can estimate the lumped effect of the unknown external disturbances acting on the control surface, the nonlinear dynamics, uncertainties, and the coupling term between HA and EHA. Based on the observed states of ESO, motion synchronisation controllers are presented to make HA and EHA to simultaneously track the desired motion trajectories, which are generated by a trajectory generator. Additionally, the unknown disturbances and the coupling terms can be compensated by using the extended state of the proposed ESO. Finally, comparative simulation results indicate that the proposed ESO-based motion synchronisation controller can achieve great force fighting reduction between HA and EHA.