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Identification of multiple frequency response points using gain-changing nonlinear feedback experiments

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dc.contributor.authorRomero Pérez, Julio Ariel
dc.contributor.authorMiguel-Escrig, Oscar
dc.contributor.authorSánchez Moreno, José
dc.contributor.authorDormido Canto, Sebastián
dc.contributor.funderAgencia Estatal de Investigación (España)
dc.date.accessioned2026-01-14T12:51:25Z
dc.date.available2026-01-14T12:51:25Z
dc.date.issued2025-12-09
dc.descriptionThe registered version of this article, first published in “European Journal of Control, 87", is available online at the publisher's website: https://doi.org/10.1016/j.ejcon.2025.101437
dc.descriptionLa versión registrada de este artículo, publicado por primera vez en “European Journal of Control, 87", está disponible en línea en el sitio web del editor: https://doi.org/10.1016/j.ejcon.2025.101437
dc.description.abstractRelay feedback experiments are well known for providing valuable information about system dynamics, which can be used for automatic PID controller tuning. The estimation of frequency response points from data obtained in such experiments is typically based on describing function theory, which assumes purely sinusoidal closed-loop responses and neglects higher-order harmonics. However, this assumption is often violated in low-order systems with poor filtering characteristics, resulting in reduced estimation accuracy. To address this issue, several alternatives, such as the saturation relay and pre-load relay, have been proposed in the literature, offering improved estimation performance. In this work, it is introduced a gain-changing nonlinear scheme for frequency points identification that enhances the accuracy of existing approaches. The experiments follow a similar structure to standard relay feedback tests, thus preserving their well-known advantages while significantly reducing estimation errors. Furthermore, by incorporating calculated time delays and dynamically adjusting the gain-changing parameters, the method generates multiple closed-loop oscillation conditions to identify several frequency response points, all while keeping the output amplitude within safe operational limits. Simulation results demonstrate a substantial improvement in estimation accuracy compared to both traditional and enhanced relay-based methods, offering a precise and practical solution for frequency response identification in industrial process control.en
dc.description.provenanceMade available in DSpace on 2026-01-14T12:51:25Z (GMT). No. of bitstreams: 1 SanchezMorenoJoseIdentification of multiple f_JOSE SANCHEZ MORENO.pdf: 10095253 bytes, checksum: ac2f2a8c8e53a20c2e9d8b2e2528e7d7 (MD5) Previous issue date: 2025-12-09en
dc.description.sponsorshipThis work was supported by the research project UJI-2024-22 and by the State Research Agency under project PID2020-112658RB-I00.
dc.description.versionversión publicada
dc.identifier.citationRomero-Pérez, J.-A., Miguel-Escrig, O., Sánchez-Moreno, J., & Dormido-Bencomo, S. (2026). Identification of multiple frequency response points using gain-changing nonlinear feedback experiments. European Journal of Control, 87. https://doi.org/10.1016/J.EJCON.2025.101437
dc.identifier.doihttps://doi.org/10.1016/j.ejcon.2025.101437
dc.identifier.issn0947-3580
dc.identifier.urihttps://hdl.handle.net/20.500.14468/31408
dc.journal.titleEuropean Journal of Control
dc.journal.volume87
dc.language.isoen
dc.publisherElsevier
dc.relation.centerE.T.S. de Ingeniería Informática
dc.relation.departmentInformática y Automática
dc.relation.projectidinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-112658RB-I00/ES/CONTROL RESILIENTE Y SEGURO DE SISTEMAS CIBERFISICOS COOPERATIVOS
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject1203.17 Informática
dc.subject.keywordsIdentificationes
dc.subject.keywordsExperimentes
dc.subject.keywordsRelayes
dc.subject.keywordsGain-changinges
dc.titleIdentification of multiple frequency response points using gain-changing nonlinear feedback experimentsen
dc.typeartículoes
dc.typejournal articleen
dspace.entity.typePublication
relation.isAuthorOfPublicationcafb43c8-2038-4e5c-a3b3-f53b9fc7f8c1
relation.isAuthorOfPublicationf5f57d8a-f3c0-40a1-a93c-80d6237a2bcb
relation.isAuthorOfPublication.latestForDiscoverycafb43c8-2038-4e5c-a3b3-f53b9fc7f8c1
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