On Designing Time-Varying Delay Feedback Controllers for Master–Slave Synchronization of Lur´e Systems

This paper is concerned with the problem of designing time-varying delay feedback controllers for master-slave synchronization of Lur´e systems. Two cases of time-varying delays are fully considered; one is the time-varying delay being continuous uniformly bounded while the other is the time-varying delay being differentiable uniformly bounded with the derivative of the delay bounded by a constant. Based on Lyapunov-Krasovskii functional approach, some delay-dependent synchronization criteria are first obtained and formulated in the form of linear matrix inequalities (LMIs). The relationship between synchronization criteria for the two cases of time-varying delays is built. Then, sufficient conditions on the existence of a time-varying delay feedback controller are derived by employing these newly-obtained synchronization criteria. The controller gains can be achieved by solving a set of LMIs. Finally, Chua´s circuit is used to illustrate the effectiveness of the design method.