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

Published 27 Dec 2023 in eess.SY and cs.SY | (2312.16738v1)

Abstract: Inspired by the widespread theory of complete-type Lyapunov-Krasovskii functionals, the article considers an alternative class of Lyapunov-Krasovskii functionals that intends to achieve less conservative robustness bounds. These functionals share the same structure as the functionals of complete type, and also they share to be defined via their derivative along solutions of the nominal system. The defining equation for the derivative, however, is chosen differently: the Lyapunov equation, which forms the template for the defining equation of complete-type Lyapunov-Krasovskii functionals, is replaced by the template of an algebraic Riccati equation. Properties of the proposed Lyapunov-Krasovskii functionals of robust type are proven in the present article. Moreover, existence conditions are derived from the infinite-dimensional Kalman-Yakubovich-Popov lemma, combined with a splitting approach. The concept is tailored to sector-based absolute stability problems, and the obtainable robustness bounds are strongly related to the small-gain theorem, the complex stability radius, passivity theorems, the circle criterion, and integral quadratic constraints with constant multipliers, where, however, the nominal system itself has a time delay.

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Authors (1)

  1. Tessina H. Scholl 

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