title: Delay-range-dependent chaos synchronization approach under varying time-lags and delayed nonlinear coupling.
abstract: This paper proposes a novel state feedback delay-range-dependent control approach for chaos synchronization in coupled nonlinear time-delay systems. The coupling between two systems is esteemed to be nonlinear subject to time-lags. Time-varying nature of both the intrinsic and the coupling delays is incorporated to broad scope of the present study for a better-quality synchronization controller synthesis. Lyapunov-Krasovskii (LK) functional is employed to derive delay-range-dependent conditions that can be solved by means of the conventional linear matrix inequality (LMI)-tools. The resultant control approach for chaos synchronization of the master-slave time-delay systems considers non-zero lower bound of the intrinsic as well as the coupling time-delays. Further, the delay-dependent synchronization condition has been established as a special case of the proposed LK functional treatment. Furthermore, a delay-range-dependent condition, independent of the delay-rate, has been provided to address the situation when upper bound of the delay-derivative is unknown. A robust state feedback control methodology is formulated for synchronization of the time-delay chaotic networks against the L2 norm bounded perturbations by minimizing the L2 gain from the disturbance to the synchronization error. Numerical simulation results are provided for the time-delay chaotic networks to show effectiveness of the proposed delay-range-dependent chaos synchronization methodologies.
authors.affiliation: Department of Electrical Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), P. O. Box 45650, Islamabad, Pakistan. Electronic address: mhz.uet@gmail.com.
authors.forename: Muhammad Hamad
authors.initials: MH
authors.lastname: Zaheer
authors.affiliation: Department of Electrical Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), P. O. Box 45650, Islamabad, Pakistan. Electronic address: rehanqau@gmail.com.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Rehan
authors.affiliation: Department of Electrical Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), P. O. Box 45650, Islamabad, Pakistan. Electronic address: gm@pieas.edu.pk.
authors.forename: Ghulam
authors.initials: G
authors.lastname: Mustafa
authors.affiliation: Department of Electronics Engineering, Mohammad Ali Jinnah University, Islamabad, Pakistan. Electronic address: ashraf@jinnah.edu.pk.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Ashraf
keywords: Chaos synchronization; Delay-range-dependency; Lyapunov–Krasovskii functional; Nonlinear time-delay coupling; State feedback control; Time-varying delays