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Delay-range-dependent stability criterion for interval time-delay systems with nonlinear perturbations

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Abstract

In this paper, we consider the problem of robust stability for a class of linear systems with interval time-varying delay under nonlinear perturbations using Lyapunov-Krasovskii (LK) functional approach. By partitioning the delay-interval into two segments of equal length, and evaluating the time-derivative of a candidate LK functional in each segment of the delay-interval, a less conservative delay-dependent stability criterion is developed to compute the maximum allowable bound for the delay-range within which the system under consideration remains asymptotically stable. In addition to the delay-bi-segmentation analysis procedure, the reduction in conservatism of the proposed delay-dependent stability criterion over recently reported results is also attributed to the fact that the time-derivative of the LK functional is bounded tightly using a newly proposed bounding condition without neglecting any useful terms in the delay-dependent stability analysis. The analysis, subsequently, yields a stable condition in convex linear matrix inequality (LMI) framework that can be solved non-conservatively at boundary conditions using standard numerical packages. Furthermore, as the number of decision variables involved in the proposed stability criterion is less, the criterion is computationally more effective. The effectiveness of the proposed stability criterion is validated through some standard numerical examples.

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Authors and Affiliations

  1. Department of Electrical Engineering, Indian Institute of Technology, West Bengal, 721302, India

    K. Ramakrishnan & G. Ray

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  1. K. Ramakrishnan
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  2. G. Ray
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Correspondence to K. Ramakrishnan.

Additional information

K. Ramakrishnan graduated from Government College of Technology, Coimbatore, Tamil Nadu, India in 1993. He received the M.Eng. degree in control systems engineering from P.S.G. College of Technology, Coimbatore, Tamil Nadu, India in 1995. He is currently a full time research scholar in the Department of Electrical Engineering, Indian Institute of Technology, Kharagpur, India.

His research interests include interval time-delay systems and linear matrix inequality (LMI) optimization problems.

G. Ray graduated from Jadvapur University, Kolkata, West Bengal, India in 1974. He received the M.Tech. degree from Indian Institute of Technology, Kharagpur, West Bengal, India in 1977 and the Ph.D. degree from Indian Institute of Technology, Delhi, India in 1982. He is currently a full professor with the Department of Electrical Engineering, Indian Institute of Technology, Kharagpur, India.

His research interests include robust control techniques, timedelay systems, decentralized control, and large scale systems.

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Ramakrishnan, K., Ray, G. Delay-range-dependent stability criterion for interval time-delay systems with nonlinear perturbations. Int. J. Autom. Comput. 8, 141–146 (2011). https://doi.org/10.1007/s11633-010-0566-9

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  • DOI: https://doi.org/10.1007/s11633-010-0566-9

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