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Robust shifted-IMC based modified decoupled Smith predictor for delay-dominant integrating-type chemical processes.

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Τίτλος: Robust shifted-IMC based modified decoupled Smith predictor for delay-dominant integrating-type chemical processes.
Συγγραφείς: Aryan, Pulakraj1 (AUTHOR), Kumar, Vivek2 (AUTHOR), Raja, G. Lloyds3 (AUTHOR) lloyd.raja@gmail.com, Chelliah, Thanga Raj1 (AUTHOR), Hote, Yogesh V.2 (AUTHOR)
Πηγή: International Journal of Systems Science. Feb2026, Vol. 57 Issue 3, p740-758. 19p.
Θεματικοί όροι: Chemical process control, Time delay systems, Feedback control systems, Stability theory, Continuous flow reactors, Tracking control systems
Περίληψη: Chemical processes such as bioreactors, storage tanks, and continuously stirred tank reactors (CSTR) exhibit non-self-regulation. Such processes, when accompanied by dead time, become even more challenging to control. For such processes, Smith predictor schemes are preferred over unity feedback schemes. To effectively control delay-dominant integrative chemical plants, a robust decoupled Smith predictor (RDSP) is proposed in this work. The servo tracking controller is designed using a pole-zero-shifted version of the plant model and internal model control theory. A regulatory proportional-derivative controller, which can be adjusted without affecting the servo tracking performance, is designed as per Routh's stability requirements. The tunables of servo and regulatory controllers are fine-tuned using an equilibrium optimiser after taking into account maximum sensitivity and stability constraints. This RDSP not only compensates for dead time but also permits independent tuning of its two controllers. The analytically designed servo and regulatory controllers, optimised for improved performance, exhibit superior and resilient closed-loop functionality compared to certain conventional single/dual-loop control techniques. The suggested design is further subjected to a robust stability check and fragility analysis followed by real-time validation using a benchmark non-linear model of an isothermal continuously stirred tank reactor and OPAL-RT simulator, confirming its practical viability. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Systems Science is the property of Taylor & Francis Ltd 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.)
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  Data: Robust shifted-IMC based modified decoupled Smith predictor for delay-dominant integrating-type chemical processes.
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Systems+Science%22">International Journal of Systems Science</searchLink>. Feb2026, Vol. 57 Issue 3, p740-758. 19p.
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– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Chemical processes such as bioreactors, storage tanks, and continuously stirred tank reactors (CSTR) exhibit non-self-regulation. Such processes, when accompanied by dead time, become even more challenging to control. For such processes, Smith predictor schemes are preferred over unity feedback schemes. To effectively control delay-dominant integrative chemical plants, a robust decoupled Smith predictor (RDSP) is proposed in this work. The servo tracking controller is designed using a pole-zero-shifted version of the plant model and internal model control theory. A regulatory proportional-derivative controller, which can be adjusted without affecting the servo tracking performance, is designed as per Routh's stability requirements. The tunables of servo and regulatory controllers are fine-tuned using an equilibrium optimiser after taking into account maximum sensitivity and stability constraints. This RDSP not only compensates for dead time but also permits independent tuning of its two controllers. The analytically designed servo and regulatory controllers, optimised for improved performance, exhibit superior and resilient closed-loop functionality compared to certain conventional single/dual-loop control techniques. The suggested design is further subjected to a robust stability check and fragility analysis followed by real-time validation using a benchmark non-linear model of an isothermal continuously stirred tank reactor and OPAL-RT simulator, confirming its practical viability. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Systems Science is the property of Taylor & Francis Ltd 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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        Value: 10.1080/00207721.2025.2510313
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        Text: English
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        Type: general
      – SubjectFull: Time delay systems
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      – SubjectFull: Continuous flow reactors
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      – SubjectFull: Tracking control systems
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      – TitleFull: Robust shifted-IMC based modified decoupled Smith predictor for delay-dominant integrating-type chemical processes.
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              Text: Feb2026
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              Y: 2026
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