Fault Estimation and Resilient Tolerant Control for Turbofan Switched Systems under Disturbances

The paper examines fault estimation and resilient fault-tolerant control (FERTC) strategies for uncertain turbofan switched systems (UTSSs) subject to parameter uncertainties, various fault conditions, and external disturbances. By defining an intermediate variable, a switching estimator is established, thereby reducing the usual limitations on observer matching conditions. Meanwhile, the resilient fault-tolerant controller is constructed by combining the fault-tolerant control method with the resilient control technique. Then, based on hybrid switching mechanism and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$H_{\infty}$</tex> control theory, FERTC strategy are established. By employing Lyapunov stability theory, the asymptotic stability of the UTSSs is obtained under the designed controller.