METHODS TO MEASURE THERMAL DEPOLARIZATION EFFECTS IN PIEZOELECTRIC RING ELEMENTS FOR KNOCK SENSORS

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dc.contributor.authorFialka, Jiřícs
dc.contributor.authorKlusáček, Stanislavcs
dc.contributor.authorHavránek, Zdeněkcs
dc.contributor.authorBeneš, Petrcs
dc.date.issued2022-07-24cs
dc.description.abstractKnock sensors use piezoelectric ceramics as the active element, whose parameters can change over time due to ambient conditions. One of the major environmental impacts on the sensor – its internal active element in particular – is that of the temperature. The knock sensor is placed directly on the device to be examined, such as the automobile engine block or the combustion engines in biogas cogeneration (CHP) units. In these units, above all, the temperature of the engine block often exceeds 100 °C. Prolonged exposure of the sensor to such conditions can damage the protective housing; more important, however, is the partial depolarization of the piezomaterial inside the sensor. We employed the frequency and the direct charge coefficient methods to determine how the temperature affects the parameters of the ring piezoelectric ce-ramics. The frequency approach allows us to establish the resonance frequency and the electrome-chanical coefficient, facilitating partial evaluation of quality in the piezoceramics. The tech-nique nevertheless cannot be used in deriving the relevant piezoelectric charge coefficient. If paired with the direct method, the procedure will characterize the stability of the resonance frequency and the depolarization level in the ring being tested. In the experiment, the CeramTec's Sonox P502 material was inserted directly into the knock sensors. The stability of the resonance frequency was assessed by using an Agilent 4294a im-pedance analyser. Subsequently, the samples were measured via the direct method to quantify the piezoelectric charge coefficient. The experiment yielded a comprehensive description of the impact exerted by a thermal wave on the active elements of a knock sensor; moreover, we identified convenient methods to de-termine the parameters of a set of samples in terms of the operational quality and suitability.en
dc.formattextcs
dc.format.extent1-8cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationProceedings of the 28th International Congress on Sound and Vibration. 2022, p. 1-8.en
dc.identifier.isbn978-981-18-5070-7cs
dc.identifier.orcid0000-0001-8541-8155cs
dc.identifier.orcid0000-0002-9849-1105cs
dc.identifier.orcid0000-0002-8761-6590cs
dc.identifier.orcid0000-0002-3712-7107cs
dc.identifier.other179088cs
dc.identifier.researcheridG-8696-2014cs
dc.identifier.researcheridH-2234-2016cs
dc.identifier.researcheridD-7933-2012cs
dc.identifier.researcheridB-1805-2008cs
dc.identifier.scopus56087172100cs
dc.identifier.scopus9336430800cs
dc.identifier.scopus54981039700cs
dc.identifier.scopus7006828688cs
dc.identifier.urihttp://hdl.handle.net/11012/249168
dc.language.isoencs
dc.publisherSociety of Acousticscs
dc.relationEuropean Union (EU) & "Horizon 2020"
dc.relation.ispartofProceedings of the 28th International Congress on Sound and Vibrationcs
dc.relation.projectIdinfo:eu-repo/grantAgreement/EC/H2020/857306/EU//RICAIP
dc.relation.urihttps://www.iiav.org/icsv28/indexc03b.html?va=viewpage&vaid=247cs
dc.rightsCreative Commons Attribution-NonCommercial-ShareAlike 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/4.0/cs
dc.subjectknock sensoren
dc.subjectpiezoelectric ceramicsen
dc.subjectbiogas cogenerationen
dc.subjectthermal waveen
dc.titleMETHODS TO MEASURE THERMAL DEPOLARIZATION EFFECTS IN PIEZOELECTRIC RING ELEMENTS FOR KNOCK SENSORSen
dc.type.driverconferenceObjecten
dc.type.versionacceptedVersionen
sync.item.dbidVAV-179088en
sync.item.dbtypeVAVen
sync.item.insts2025.02.12 09:58:37en
sync.item.modts2025.02.10 22:32:03en
thesis.grantorVysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií. Ústav automatizace a měřicí technikycs
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Kybernetika a robotikacs
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