H∞ output tracking control for flight control systems with time-varying delay

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.