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Appl. Sci. 2017, 7(3), 219; doi:10.3390/app7030219

Robust Backstepping Control of Wing Rock Using Disturbance Observer

College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
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Author to whom correspondence should be addressed.
Academic Editor: Christos Bouras
Received: 5 January 2017 / Accepted: 20 February 2017 / Published: 24 February 2017

Abstract

Wing rock is a highly nonlinear phenomenon when the aircraft suffers undesired roll-dominated oscillatory at high angle of attack (AOA). Considering the strong nonlinear and unsteady aerodynamic characteristics, an uncertain multi-input and multi-output (MIMO) nonlinear wing rock model is studied, and system uncertainties, unsteady aerodynamic disturbances and externaldisturbancesareconsideredinthedesignofwingrockcontrollaw. Tohandletheproblemof multipledisturbances,arobustcontrolschemeisproposedbasedontheextendedstateobserver(ESO) and the radial basis function neural network (RBFNN) technique. Considering that the effectiveness of actuators are greatly decreased at high AOA, the input saturation problem is also handled by constructing a corresponding auxiliary system. Based on the improved ESO and the auxiliary system, a robust backstepping control law is proposed for the wing rock control. In addition, the dynamic surface control (DSC) technique is introduced to avoid the tedious computations of time derivatives for the virtual control laws in the backstepping method. The stability of the closed-loop system is guaranteed via rigorously Lyapunov analysis. Finally, simulation results are presented to illustrate the effectiveness of the ESO and the proposed wing rock control approach. View Full-Text
Keywords: wing rock; RBFNN; unsteady aerodynamics; extended state observer; robust attitude control; backstepping control wing rock; RBFNN; unsteady aerodynamics; extended state observer; robust attitude control; backstepping control
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wu, D.; Chen, M.; Gong, H.; Wu, Q. Robust Backstepping Control of Wing Rock Using Disturbance Observer. Appl. Sci. 2017, 7, 219.

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