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| 1 | H_∞ output tracking control for flight control systems with time-varying delay显示文摘For flight control systems with time-varying delay,an H∞output tracking controller is proposed.The controller is designed for the discrete-time state-space model of general aircraft to reduce the effects of uncertainties of the mathematical model,external disturbances,and bounded time-varying delay.It is assumed that the feedback-control loop is closed by the communication network,and the network-based control architecture induces time-delays in the feedback information.Suppose that the time delay has both an upper bound and a lower bound.By using the Lyapunov-Krasovskii function and the linear matrix inequality(LMI),the delay-dependent stability criterion is derived for the time-delay system.Based on the criterion,a state-feedback H∞output tracking controller for systems with norm-bounded uncertainties and time-varying delay is presented.The control scheme is applied to the high incidence research model(HIRM),which shows the effectiveness of the proposed approach. | Zhang Yingxin Wang Qing Dong Chaoyang Jiang Yifan | 2013 | Chinese Journal of Aeronautics2013，26，5： | 4 |
| 2 | Closed-loop fault detection for full-envelope fligh vehicle with measurement delays显示文摘A closed-loop fault detection problem is investigated for the full-envelope flight vehicle with measurement delays,where the flight dynamics are modeled as a switched system with delayed feedback signals.The mode-dependent observer-based fault detection filters and state estimation feedback controllers are derived by considering the delays’impact on the control system and fault detection system simultaneously.Then,considering updating lags of the controllers/filters’switching signals which are introduced by the delayed measurement of altitude and Mach number,an asynchronous H∞ analysis method is proposed and the system model is further augmented to be an asynchronously switched time-delay system.Also,the global stability and desired performance of the augmented system are guaranteed by combining the switched delay-dependent Lyapunov–Krasovskii functional method with the average dwell time method(ADT),and the delaydependent existing conditions for the controllers and fault detection filters are obtained in the form of the linear matrix inequalities(LMIs).Finally,numerical example based on the hypersonic vehicles and highly maneuverable technology(Hi MAT)vehicle is given to demonstrate the merits of the proposed method. | Wang Zhaolei Wang Qing Dong Chaoyang Gong Ligang | 2015 | Chinese Journal of Aeronautics2015，28，3： | 2 |
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