Nonlinear Fault-Tolerant Control for Hypersonic Flight Vehicle With Multi-Sensor Faults

Nonlinear Fault-Tolerant Control for Hypersonic Flight Vehicle With Multi-Sensor Faults

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This paper presents a nonlinear fault-tolerant control (FTC) gildan antique orange and sensor fault diagnosis for longitudinal dynamics of hypersonic flight vehicle.A nominal sliding mode control is developed to track the reference command of velocity and altitude on the basis of an affine nonlinear dynamic model.A nonlinear adaptive observer is proposed to estimate the fault in velocity system.The fault in altitude system is estimated using the coupling item as an estimation item through a backstepping sliding-mode observer to achieve an estimation performance better than that of the original adaptive observer.

The estimation results are used to design a nonlinear FTC to compensate the multi-sensor faults.The stability of the controller is analyzed through Lyapunov theory.Numerical simulation results demonstrate the p3221d validity and robustness of the proposed controller and observer.