A comprehensive RFD-FTC-DCA system for hypersonic vehicles with saturation constraints

Abstract

A comprehensive RFD-FTC-DCA system is proposed for the hypersonic vehicle with saturation constraints to resist the control surface damage, actuator faults, disturbances and parameter perturbation. Firstly, the hypersonic vehicle fault model is established. Secondly, the robust fault detection (RFD) observer is designed to detect the control surface damage and actuator faults accurately under the influences of disturbances and parameter perturbation. Thirdly, the fault-tolerant control (FTC) law is designed to resist the control surface damage, actuator faults, disturbances and parameter perturbation simultaneously. Finally, a dynamic control allocation (DCA) algorithm is designed to reallocate the FTC law and limit the deflection angle and velocity within saturation constraint. The comparison simulation results are presented to demonstrate that the RFD observer can detect the faults accurately and reduce false alarm rates effectively, the FTC law can resist the control surface damage, actuator faults, disturbances and parameter perturbation simultaneously, and the tracing errors of attack angle, side-slip angle and roll angle are only $\pm {0.7}^{\circ }$,$\pm {0.2}^{\circ }$ and $\pm {1.5}^{\circ }$, respectively, and the DCA algorithm can reallocate the FTC law and limit the deflection angle and velocity within saturation values.

KEYWORDS:

• saturation constraint
• control surface damage
• actuator fault
• RFD
• FTC
• DCA

Disclosure statement

No potential conflict of interest was reported by the author(s).