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In this study, Semi-Supervised Learning (SSL) is applied to a fault detection and diagnosis solution. Firstly, a dataset is generated containing both normal operating patterns and seven different failure classes of the two aforementioned failure modes that vary in intensity. Several datasets are then generated, maintaining different numbers of labeled instances and unlabeling the others, in order to evaluate the number of labeled instances needed for the desired accuracy level. Subsequently, different types of SSL algorithms and combinations of algorithms are trained and then evaluated with the test data. The results showed that an SSL approach could improve the accuracy of trained classifiers when a small number of labeled instances were used together with many unlabeled instances to train a Co-Training algorithm or combinations of such algorithms. When a few labeled instances (fewer than 10% or 327 instances, in this case) were used together with unlabeled instances, the SSL algorithms outperformed the result obtained with the Supervised Learning (SL) techniques used as a benchmark. When the number of labeled instances was sufficient, the SL algorithm (using only labeled instances) performed better than the SSL algorithms (accuracy levels of 87.04% vs. 86.45%, when labeling 10% of instances). A competitive accuracy of 97.73% was achieved with the SL algorithm processing a subset of 40% of the labeled instances.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Graphical abstract<\/jats:title>\n                <jats:p>Steps and processes for approaching semi-supervised FDD of wind-turbine gearbox misalignment and imbalance faults<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s10489-024-05373-6","type":"journal-article","created":{"date-parts":[[2024,3,28]],"date-time":"2024-03-28T06:02:31Z","timestamp":1711605751000},"page":"4525-4544","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Semi-supervised diagnosis of wind-turbine gearbox misalignment and imbalance faults"],"prefix":"10.1007","volume":"54","author":[{"given":"Jose\u00a0Alberto","family":"Maestro-Prieto","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jos\u00e9\u00a0Miguel","family":"Ram\u00edrez-Sanz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2855-7532","authenticated-orcid":false,"given":"Andr\u00e9s","family":"Bustillo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Juan\u00a0Jos\u00e9","family":"Rodriguez-D\u00edez","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,3,28]]},"reference":[{"key":"#cr-split#-5373_CR1.1","unstructured":"The European Commission (2018) Renewable Energy Directive"},{"key":"#cr-split#-5373_CR1.2","unstructured":"(EU) 2018\/2001. https:\/\/eur-lex.europa.eu\/legal-content\/EN\/TXT\/?uri=uriserv:OJ.L_.2018.328.01.0082.01.ENG &toc=OJ:L:2018:328:TOC"},{"key":"5373_CR2","doi-asserted-by":"publisher","unstructured":"Nejad AR, Keller J, Guo Y, Sheng S, Polinder H, Watson S, Dong J, Qin Z, Ebrahimi A, Schelenz R, Guti\u00e9rrez Guzm\u00e1n F, Cornel D, Golafshan R, Jacobs G, Blockmans B, Bosmans J, Pluymers B, Carroll J, Koukoura S, McDonald Hart E, A, Natarajan A, Torsvik J, Moghadam FK, Daems P-J, Verstraeten T, Peeters C, Helsen J (2022) Wind turbine drivetrains: state-of-the-art technologies and future development trends. 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