Switching fault-tolerant control of a flexible air-breathing hypersonic vehicle

In this paper, we will apply a switching fault-tolerant control approach to an air-breathing hypersonic vehicle subject to time-varying actuator and sensor faults. The faults under consideration include loss of effectiveness of the actuators and sensors. Possible fault scenarios are categorized into different fault cases based on the fault type and its location. For each case, a parameter-dependent (or constant gain) fault-tolerant control controller is designed to stabilize the faulty system with an optimal controlled performance. The synthesis condition of each local fault-tolerant control law is formulated in terms of linear matrix inequalities. To achieve both local optimal performance and switching stability, Youla parameterization of each individual local fault-tolerant control controller is performed and the result is applied to the closed-loop system. The quadratic stability of a fast switching closed-loop system is guaranteed by a common Lyapunov function. Simulation results based on the non-linear flexible hypersonic vehicle model and fault-tolerant linear-parameter-varying controllers are presented and the reults of these studies demonstrate the effectiveness of the proposed switching fault-tolerant control approach for application to a hypersonic vehicle.

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