Lyapunov-Krasovskii Functionals of Robust Type for the Stability Analysis in Time-Delay Systems

Abstract

Inspired by the widespread concept of Lyapunov-Krasovskii functionals of complete type, this article proposes an alternative class of functionals, termed Lyapunov-Krasovskii functionals of robust type. Their construction aims to improve resulting robustness bounds of linear systems with a constant delay. These refer to bounds on nonlinear or uncertain terms that can be added to the system without compromising the proof of stability. The article derives, via the classical Lyapunov-Krasovskii theorem, an $H_\infty$-norm-based small-gain robustness result established by a functional of known structure. While complete-type functionals are related to infinite-dimensional Lyapunov equations, the proposed functionals are related to infinite-dimensional algebraic Riccati equations. Existence of the functional relies on the operator-valued Kalman-Yakubovich-Popov lemma, which is made applicable due to a splitting approach. In particular, for any asymptotically stable nominal system, there exists a Lyapunov-Krasovskii functional of robust type that yields a nonzero bound on admissible perturbations. An example illustrates the reduction in conservatism compared with complete-type functionals.