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Disturbance compensation based on harmonic injection switching for unknown time-delay systems.

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Title: Disturbance compensation based on harmonic injection switching for unknown time-delay systems.
Authors: Wen, Xinyu1,2 (AUTHOR) wenxinyu@tyust.edu.cn, Guo, Jia1,2 (AUTHOR) s202315110486@stu.tyust.edu.cn, Li, Shengquan3 (AUTHOR) sqli@yzu.edu.cn, Cui, Yangyang4 (AUTHOR) yangyangcui@buaa.edu.cn
Source: ISA Transactions. Jun2026, Vol. 173, p171-180. 10p.
Subjects: Time delay systems, Time delay estimation, Feedback control systems, Oscillations
Abstract: Disturbance rejection under unknown input time-delay remains a challenging problem in control systems. This paper investigates a novel strategy for systems with both unknown input delay and periodic disturbances to achieve asymptotic compensation. First, a characteristic observer is designed to estimate the key parameters related to delay time and disturbance frequency. It is worth noting that the proposed disturbance compensation method does not rely on precise key parameter values. To address this, switching criteria are specially constructed to help determine whether the estimated values enter a reasonable region. Next, reliable delay characteristics can be used to reconstruct and predict disturbances. Compared with existing approximation approaches, the proposed prediction and compensation method requires neither a known upper bound of the delay nor an accurate delay estimate, while enabling quantitative stability analysis. Finally, a numerical example is provided to demonstrate the effectiveness of the proposed disturbance rejection method. • An online switching strategy is proposed for delay characteristics estimation and compensation. • Asymptotic rejection of periodic disturbances is achieved without assuming constant or slowly time-varying disturbances. • The method requires no delay bound and tolerates imperfect delay characteristics estimation. [ABSTRACT FROM AUTHOR]
Copyright of ISA Transactions is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 193721962
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PubTypeId: academicJournal
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  Data: Disturbance compensation based on harmonic injection switching for unknown time-delay systems.
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  Data: <searchLink fieldCode="AR" term="%22Wen%2C+Xinyu%22">Wen, Xinyu</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> wenxinyu@tyust.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Guo%2C+Jia%22">Guo, Jia</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> s202315110486@stu.tyust.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Li%2C+Shengquan%22">Li, Shengquan</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> sqli@yzu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Cui%2C+Yangyang%22">Cui, Yangyang</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> yangyangcui@buaa.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22ISA+Transactions%22">ISA Transactions</searchLink>. Jun2026, Vol. 173, p171-180. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Time+delay+systems%22">Time delay systems</searchLink><br /><searchLink fieldCode="DE" term="%22Time+delay+estimation%22">Time delay estimation</searchLink><br /><searchLink fieldCode="DE" term="%22Feedback+control+systems%22">Feedback control systems</searchLink><br /><searchLink fieldCode="DE" term="%22Oscillations%22">Oscillations</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Disturbance rejection under unknown input time-delay remains a challenging problem in control systems. This paper investigates a novel strategy for systems with both unknown input delay and periodic disturbances to achieve asymptotic compensation. First, a characteristic observer is designed to estimate the key parameters related to delay time and disturbance frequency. It is worth noting that the proposed disturbance compensation method does not rely on precise key parameter values. To address this, switching criteria are specially constructed to help determine whether the estimated values enter a reasonable region. Next, reliable delay characteristics can be used to reconstruct and predict disturbances. Compared with existing approximation approaches, the proposed prediction and compensation method requires neither a known upper bound of the delay nor an accurate delay estimate, while enabling quantitative stability analysis. Finally, a numerical example is provided to demonstrate the effectiveness of the proposed disturbance rejection method. • An online switching strategy is proposed for delay characteristics estimation and compensation. • Asymptotic rejection of periodic disturbances is achieved without assuming constant or slowly time-varying disturbances. • The method requires no delay bound and tolerates imperfect delay characteristics estimation. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of ISA Transactions is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.isatra.2026.03.027
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 10
        StartPage: 171
    Subjects:
      – SubjectFull: Time delay systems
        Type: general
      – SubjectFull: Time delay estimation
        Type: general
      – SubjectFull: Feedback control systems
        Type: general
      – SubjectFull: Oscillations
        Type: general
    Titles:
      – TitleFull: Disturbance compensation based on harmonic injection switching for unknown time-delay systems.
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            NameFull: Wen, Xinyu
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            NameFull: Guo, Jia
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            NameFull: Li, Shengquan
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            NameFull: Cui, Yangyang
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          Dates:
            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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              Value: 173
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