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Input-to-State Stability of Time-Delay Systems: A Link With Exponential Stability

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3 Author(s)
Nima Yeganefar ; LAGIS UMR CNRS 8146, Ecole Centrale de Lille, Villeneuve-d'Ascq ; Pierdomenico Pepe ; Michel Dambrine

The main contribution of this technical note is to establish a link between the exponential stability of an unforced system and the input-to-state stability (ISS) via the Liapunov-Krasovskii methodology. It is proved that a system which is (globally, locally) exponentially stable in the unforced case is (globally, locally) input-to-state stable when it is forced by a measurable and locally essentially bounded input, provided that the functional describing the dynamics in the unforced case is (globally, on bounded sets) Lipschitz and the functional describing the dynamics in the forced case satisfies a Lipschitz-like hypothesis with respect to the input. Moreover, a new feedback control law is provided for delay-free linearizable and stabilizable time-delay systems, whose dynamics is described by locally Lipschitz functionals, by which the closed-loop system is ISS with respect to disturbances adding to the control law, a typical problem due to actuator errors.

Published in:

IEEE Transactions on Automatic Control  (Volume:53 ,  Issue: 6 )