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In this paper, a new active fault tolerant control strategy is proposed for the plant in the presence of actuator fault and input constraints, which is a combination of a direct adaptive control algorithm with multiple model switching, and the μ-modification is introduced in the model reference control architecture. Based on Lyapunov-Krasovskii stability theory, the stability of overall system is...
Based on the adaptive-control technique, this paper deals with the problem of fault-tolerant tracking control for near-space-vehicle (NSV) attitude dynamics. First, Takagi-Sugeno (T-S) fuzzy models are used to describe the NSV attitude dynamics; then, an actuator-fault model is developed. Next, an adaptive fault-tolerant tracking-control scheme is proposed based on the online estimation of actuator...
This paper first develops the six degrees of freedom (DOF) nonlinear dynamic model of near space vehicle (NSV) in re-entry trajectory and analyzes its model characteristics and aerodynamic parameters, then the linear model is obtained using trim technique. The problem of fault estimation based on adaptive fault diagnosis observer is studied, which can achieve accurate estimation of fault and give...
In this paper, an indirect adaptive control scheme based on Takagi-Sugeno (TS)-type recurrent fuzzy models is proposed for nonlinear plants with unmeasurable states. The TS-type recurrent fuzzy model is used as the dynamic model of the nonlinear plant. Its recurrent property comes from that it can memorize temporal information with the feedback connections between its states layer and inputs layer,...
In this paper, the integrated application on self-adapting control of the uninhabited combat aerial vehicles is investigated. According to the characteristics of the flight control systems on various stages, a series of compatible methods about MRAC are adopted to satisfy the flight performance of the unmanned fighter aircraft. Firstly, controller of actuator is constructed according to MIT law. Then...
In this paper, a direct adaptive control reconfiguration is proposed for flight control with actuator faults characterized by second-order dynamics. Under non-measurable rates, adaptive state feedback control scheme is developed, which ensures that all closed-loop signals are bounded and plant tracking error tends to zero asymptotically, despite the uncertainties in actuator faults and plant parameters...
An automatic control reconfiguration scheme is developed based on multiple model approach for plants with unknown actuator faults. Under the designed adaptive controllers, the plant output tracks a given reference output asymptotically, despite the uncertainties in actuator failures. The stability of overall systems is proved, and numerical simulations are performed using an aircraft model to demonstrate...
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