Tripod-supported offshore wind turbines: Modal and coupled analysis and a parametric study using X-SEA and FAST

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dc.contributor.authorPlodpradit, Pasin
dc.contributor.authorDinh, Duc V.
dc.contributor.authorKim, Ki-Du
dc.contributor.funderKonkuk University, Seoul, Korea.en
dc.date.accessioned2019-11-20T05:47:59Z
dc.date.available2019-11-20T05:47:59Z
dc.date.issued2019-06-09
dc.description.abstractThis paper presents theoretical aspects and an extensive numerical study of the coupled analysis of tripod support structures for offshore wind turbines (OWTs) by using X-SEA and FAST v8 programs. In a number of site conditions such as extreme and longer period waves, fast installation, and lighter foundations, tripod structures are more advantageous than monopile and jacket structures. In the implemented dynamic coupled analysis, the sub-structural module in FAST was replaced by the X-SEA offshore substructure analysis component. The time-histories of the reaction forces and the turbine loads were then calculated. The results obtained from X-SEA and from FAST were in good agreement. The pile-soil-structure interaction (PSSI) was included for reliable evaluation of OWT structural systems. The superelement concept was introduced to reduce the computational time. Modal, coupled and uncoupled analyses of the NREL 5MW OWT-tripod support structure including PSSI were carried out and the discussions on the natural frequencies, mode shapes and resulted displacements are presented. Compared to the uncoupled models, the physical interaction between the tower and the support structure in the coupled models resulted in smaller responses. Compared to the fixed support structures, i.e., when PSSI is not included, the piled-support structure has lower natural frequencies and larger responses attributed to its actual flexibility. The models using pile superelements are computationally efficient and give results that are identical to the common finite element models.en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid181en
dc.identifier.citationPlodpradit, P., Dinh, V.N. and Kim, K.D., 2019. Tripod-Supported Offshore Wind Turbines: Modal and Coupled Analysis and a Parametric Study Using X-SEA and FAST. Journal of Marine Science and Engineering, 7(6), (181). DOI:10.3390/jmse7060181en
dc.identifier.doi10.3390/jmse7060181en
dc.identifier.eissn2077-1312
dc.identifier.endpage20en
dc.identifier.issued6en
dc.identifier.journaltitleJournal of Marine Science and Engineeringen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/9138
dc.identifier.volume7en
dc.language.isoenen
dc.publisherMDPIen
dc.relation.urihttps://www.mdpi.com/2077-1312/7/6/181
dc.rights© 2019 by the authors. Licensee MDPI, Basel, Switzerlanden
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectOffshore wind turbineen
dc.subjectTripod support structuresen
dc.subjectCoupled analysisen
dc.subjectUncoupled analysisen
dc.subjectSoil-pile-structure interactionen
dc.subjectSuperelementen
dc.titleTripod-supported offshore wind turbines: Modal and coupled analysis and a parametric study using X-SEA and FASTen
dc.typeArticle (peer-reviewed)en
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