Further Remarks on Strict Input-to-State Stable Lyapunov Functions for Time-Varying Systems

Details Further Remarks on Strict Input-to-State Stable Lyapunov Functions for Time-Varying Systems Further Remarks on Strict Input-to-State Stable Lyapunov Functions for Time-Varying Systems

2004-11-07

arxiv.org/abs/math/0411150v1

Automatica, Volume 41, Issue 11, pp. 1973-1978, November 2005

Mathematics

Optimization and Control

6 pages, submitted for publication in June 2004

Scientific paper

10.1016/j.automatica.2005.05.015

We study the stability properties of a class of time-varying nonlinear systems. We assume that non-strict input-to-state stable (ISS) Lyapunov functions for our systems are given and posit a mild persistency of excitation condition on our given Lyapunov functions which guarantee the existence of strict ISS Lyapunov functions for our systems. Next, we provide simple direct constructions of explicit strict ISS Lyapunov functions for our systems by applying an integral smoothing method. We illustrate our constructions using a tracking problem for a rotating rigid body.

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