{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T16:11:29Z","timestamp":1760112689515,"version":"build-2065373602"},"reference-count":24,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2024,8,7]],"date-time":"2024-08-07T00:00:00Z","timestamp":1722988800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Korea Institute of Energy Technology Evaluation and Planning (KETEP)","award":["20224000000040","20213030020120"],"award-info":[{"award-number":["20224000000040","20213030020120"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["MAKE"],"abstract":"<jats:p>Securing the structural safety of blades has become crucial, owing to the increasing size and weight of blades resulting from the recent development of large wind turbines. Composites are primarily used for blade manufacturing because of their high specific strength and specific stiffness. However, in composite blades, joints may experience fractures from the loads generated during wind turbine operation, leading to deformation caused by changes in structural stiffness. In this study, 7132 debonding damage data, classified by damage type, position, and size, were selected to predict debonding damage based on natural frequency. The change in the natural frequency caused by debonding damage was acquired through finite element (FE) modeling and modal analysis. Synchronization between the FE analysis model and manufactured blades was achieved through modal testing and data analysis. Finally, the relationship between debonding damage and the change in natural frequency was examined using artificial neural network techniques.<\/jats:p>","DOI":"10.3390\/make6030091","type":"journal-article","created":{"date-parts":[[2024,8,10]],"date-time":"2024-08-10T06:25:24Z","timestamp":1723271124000},"page":"1857-1870","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Accuracy Improvement of Debonding Damage Detection Technology in Composite Blade Joints for 20 kW Class Wind Turbine"],"prefix":"10.3390","volume":"6","author":[{"given":"Hakgeun","family":"Kim","sequence":"first","affiliation":[{"name":"The Innovation Research Center for Giant Wind Turbine System, Kunsan National University, Gunsan-si 54150, Republic of Korea"}]},{"given":"Hyeongjin","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Kunsan National University, Gunsan-si 54150, Republic of Korea"}]},{"given":"Kiweon","family":"Kang","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Kunsan National University, Gunsan-si 54150, Republic of Korea"}]}],"member":"1968","published-online":{"date-parts":[[2024,8,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1407","DOI":"10.3795\/KSME-A.2011.35.11.1407","article-title":"Full Scale Structural Testing of Small Wind Turbine Composite Blade","volume":"35","author":"Kim","year":"2011","journal-title":"Trans. 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