Friction and Wear Monitoring Methods for Journal Bearings of Geared Turbofans Based on Acoustic Emission Signals and Machine Learning

dc.contributor.authorMokhtari, Noushin
dc.contributor.authorPelham, Jonathan Gerald
dc.contributor.authorNowoisky, Sebastian
dc.contributor.authorBote-Garcia, José-Luis
dc.contributor.authorGühmann, Clemens
dc.date.accessioned2020-05-04T13:25:39Z
dc.date.available2020-05-04T13:25:39Z
dc.date.issued2020-03-07
dc.date.updated2020-04-28T01:58:03Z
dc.description.abstractIn this work, effective methods for monitoring friction and wear of journal bearings integrated in future UltraFan® jet engines containing a gearbox are presented. These methods are based on machine learning algorithms applied to Acoustic Emission (AE) signals. The three friction states: dry (boundary), mixed, and fluid friction of journal bearings are classified by pre-processing the AE signals with windowing and high-pass filtering, extracting separation effective features from time, frequency, and time-frequency domain using continuous wavelet transform (CWT) and a Support Vector Machine (SVM) as the classifier. Furthermore, it is shown that journal bearing friction classification is not only possible under variable rotational speed and load, but also under different oil viscosities generated by varying oil inlet temperatures. A method used to identify the location of occurring mixed friction events over the journal bearing circumference is shown in this paper. The time-based AE signal is fused with the phase shift information of an incremental encoder to achieve an AE signal based on the angle domain. The possibility of monitoring the run-in wear of journal bearings is investigated by using the extracted separation effective AE features. Validation was done by tactile roughness measurements of the surface. There is an obvious AE feature change visible with increasing run-in wear. Furthermore, these investigations show also the opportunity to determine the friction intensity. Long-term wear investigations were done by carrying out long-term wear tests under constant rotational speeds, loads, and oil inlet temperatures. Roughness and roundness measurements were done in order to calculate the wear volume for validation. The integrated AE Root Mean Square (RMS) shows a good correlation with the journal bearing wear volume.en
dc.description.sponsorshipDFG, 414044773, Open Access Publizieren 2019 - 2020 / Technische Universität Berlinen
dc.identifier.eissn2075-4442
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/11078
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-9966
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc621 Angewandte Physikde
dc.subject.otherjournal bearingen
dc.subject.otheracoustic emissionen
dc.subject.othermachine learningen
dc.subject.otherfriction classificationen
dc.subject.otherfriction localizationen
dc.subject.otherrun-in wearen
dc.subject.otherlong-term wearen
dc.titleFriction and Wear Monitoring Methods for Journal Bearings of Geared Turbofans Based on Acoustic Emission Signals and Machine Learningen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber29en
dcterms.bibliographicCitation.doi10.3390/lubricants8030029en
dcterms.bibliographicCitation.issue3en
dcterms.bibliographicCitation.journaltitleLubricantsen
dcterms.bibliographicCitation.originalpublishernameMDPIen
dcterms.bibliographicCitation.originalpublisherplaceBaselen
dcterms.bibliographicCitation.volume8en
tub.accessrights.dnbfreeen
tub.affiliationFak. 4 Elektrotechnik und Informatik>Inst. Energie- und Automatisierungstechnik>FG Elektronische Mess- und Diagnosetechnikde
tub.affiliation.facultyFak. 4 Elektrotechnik und Informatikde
tub.affiliation.groupFG Elektronische Mess- und Diagnosetechnikde
tub.affiliation.instituteInst. Energie- und Automatisierungstechnikde
tub.publisher.universityorinstitutionTechnische Universität Berlinen
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