Cited by 1Stability and Control of Uncertain SystemsNonlinear Differential Equations AnalysisControl and Stability of Dynamical Systems

Contraction Analysis of Almost Surely Monotone Discrete-Time Systems With Unknown Time Delay

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Kawano, Yu, Hosoe, Yohei·2025·IEEE Control Systems Letters

Abstract

In this paper, we utilize monotonicity to simplify contraction analysis of discrete-time nonlinear time-delay systems with parameters following stochastic processes. First, we extend the concept of almost sure monotonicity to the time-delay systems, which can be verified via analysis of the corresponding prolonged systems. Next, we introduce a novel notion of uniform incremental asymptotic stability (UIAS) in the first moment to the time-delay systems and develop its sufficient condition. By virtue of almost sure monotonicity, if this condition holds, the time-delay systems are UIAS in the first moment for any finite length of delay. Moreover, the proposed result suggests that UIAS in the first moment has a strong connection with stability of the averaged deterministic systems. We formalize this observation for almost surely cooperative systems by establishing the equivalence between UIAS and uniform incremental asymptotic mean stability.

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Crossref · 10.1109/lcsys.2025.3574230

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  1. Bullo, 2022, Contraction Theory for Dynamical Systems

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Authors
Kawano, Y., & Hosoe, Y.
Affiliations
  • Hiroshima University (JP)
  • Kyoto University (JP)
Venue
IEEE Control Systems Letters
Published
2025
Volume
9
Pages
426-431
ISSN
2475-1456 (ISSN-L)
OpenAlex
W4410771883
Cited by
1
References
24
Citations by year
2026: 1
FWCI
0.37
Type
journal article
Language
en
Open access
Locations
IEEE Control Systems Letters (publishedVersion, cc-by-nc-nd)
Funders
  • JST FOREST Program (JPMJFR222E)
  • JSPS KAKENHI (21H04875, 24K00910, 23K26127)
  • JST PRESTO (JPMJPR2127)
Topics
  • Physical Sciences › Engineering › Control and Systems Engineering › Stability and Control of Uncertain Systems
  • Physical Sciences › Mathematics › Applied Mathematics › Nonlinear Differential Equations Analysis
  • Physical Sciences › Engineering › Control and Systems Engineering › Control and Stability of Dynamical Systems
Keywords
contraction analysis, discrete-time nonlinear systems, time-delay systems, unknown time delay, stochastic parameters, collaborative systems

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