Adaptive active fault-tolerant controller design for high-speed trains subject to unknown actuator faults

ABSTRACT The tracking control problem for high-speed trains (HSTs) with the running resistance, the additional resistance and unknown actuator faults is investigated. First, based on the linearisation principle HSTs are modelled as the linear system with the unmatched time-varying uncertainty resulting from the interactive force among the connected carriages. Then, during the procedure of controller design, the adaptive control is applied to compensating for the unknown actuator faults. Meanwhile, control is used for rejecting and attenuating the effects of the norm-bounded disturbance. In order to obtain good tracking performances, two novel adaptive active fault-tolerant controllers are proposed. The stability of the closed-loop system via two control schemes is proved by the Lyapunov theory and linear matrix inequation. The effectiveness of the presented control scheme is validated by simulation results.

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