An adaptive disturbance suppression based fault-tolerant control approach against the control surface faults

This paper is concerned with the attitude control problem under the fault of aircraft control surface. Firstly, when the control surface suffers a structural missing fault, the aerodynamic characteristics will change significantly and the tracking perfor-mance of the pre-defined nominal controller will be seriously affected. An adaptive distur-bance rejection control method based on nonlinear recursive least squares identification is proposed, which combines real-time model identification and nonlinear dynamic inverse to control the aircraft using the causeless force and moment models calculated from the identification model. Comparing the closed-loop simulation results of the adaptive distur-bance suppression controller with the nominal controller shows that the control method in this paper improves the control quality, maneuvering stability and system response speed, and reduces the overshoot in the control process.