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Path-Complete Graphs and Common Lyapunov Functions

Published: 13 April 2017 Publication History

Abstract

A Path-Complete Lyapunov Function is an algebraic criterion composed of a finite number of functions, called pieces, and a directed, labeled graph defining Lyapunov inequalities between these pieces. It provides a stability certificate for discrete-time arbitrary switching systems. In this paper, we prove that the satisfiability of such a criterion implies the existence of a Common Lyapunov Function, expressed as the composition of minima and maxima of the pieces of the Path-Complete Lyapunov function. the converse however is not true even for discrete-time linear systems: we present such a system where a max-of-2 quadratics Lyapunov function exists while no corresponding Path-Complete Lyapunov function with 2 quadratic pieces exists. In light of this, we investigate when it is possible to decide if a Path- Complete Lyapunov function is less conservative than another. By analyzing the combinatorial and algebraic structure of the graph and the pieces respectively, we provide simple tools to decide when the existence of such a Lyapunov function implies that of another.

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    cover image ACM Conferences
    HSCC '17: Proceedings of the 20th International Conference on Hybrid Systems: Computation and Control
    April 2017
    288 pages
    ISBN:9781450345903
    DOI:10.1145/3049797
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    Published: 13 April 2017

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    Author Tags

    1. Lyapunov function
    2. discrete-time switching systems
    3. observer automaton
    4. path-complete graphs

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    HSCC '17 Paper Acceptance Rate 29 of 76 submissions, 38%;
    Overall Acceptance Rate 153 of 373 submissions, 41%

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    • (2019)A Converse Lyapunov Theorem for p-dominant Switched Linear Systems2019 18th European Control Conference (ECC)10.23919/ECC.2019.8795923(1263-1268)Online publication date: Jun-2019
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    • (2019)On Path-Complete Lyapunov Functions: Geometry and ComparisonIEEE Transactions on Automatic Control10.1109/TAC.2018.286338064:5(1947-1957)Online publication date: May-2019
    • (2019)Exponential Stabilizability Analysis for Constrained Switched System2019 IEEE 8th Data Driven Control and Learning Systems Conference (DDCLS)10.1109/DDCLS.2019.8908856(934-938)Online publication date: May-2019
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    • (2018)Max-Min Lyapunov Functions for Switching Differential Inclusions2018 IEEE Conference on Decision and Control (CDC)10.1109/CDC.2018.8619690(5664-5669)Online publication date: Dec-2018

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