Fault Tolerant Control Using a Fixed-time Second Order Sliding Mode

In this article, a fault tolerant control (FTC) is proposed for a longitudinal aircraft model. A mathematic model for a pitch plane missile motion is established by considering actuator faults and system uncertainties. Subsequently, to achieve superior tracking performance compared with other sliding mode observers (SMO), a sliding model observer is designed to approximate system uncertainties and actuator faults as the lumped disturbances. Finally, a fixed-time second-order sliding mode controller is designed. Simulation results are given to show the effectiveness and advantages of the proposed method.