Innovative hull design for servicing offshore wind turbines

dc.check.embargoformatNot applicableen
dc.check.infoNo embargo requireden
dc.check.opt-outNot applicableen
dc.check.reasonNo embargo requireden
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dc.contributor.advisorMurphy, Jamesen
dc.contributor.advisorLewis, Anthonyen
dc.contributor.authorShanley, Matthew
dc.contributor.funderHigher Education Authorityen
dc.contributor.funderUniversity College Corken
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2018-04-17T12:11:14Z
dc.date.available2018-04-17T12:11:14Z
dc.date.issued2018
dc.date.submitted2018
dc.description.abstractAccessing turbines for maintenance is a key operational issue for an offshore wind farm. Currently there is a 1.5m significant wave height (Hs) limit for the standard “step over” method of transferring personnel to an offshore wind turbine, though this varies with, vessel type, wave period and direction, as well as wind, and current conditions. The thesis aims to quantify limiting conditions for access, and increase the Hs at which offshore wind turbines can be accessed. This thesis investigated the motion of novel ship hull designs, and quantified parameters that influence the transfer of personnel from a wind farm service vessel (WFSV) to a wind turbine. To complete the work for this thesis numerical, and physical techniques were utilised to model WFSV designs at zero forward speed in open water, and when docked with an offshore wind farm monopile. When designs were being investigated particular attention was paid to novel hull geometry, and the addition of heaveplates to catamaran hulls. A directional study on WFSV interaction with a monopile was carried out, and polar plots of performance were calculated. The limits of motion that a safe transfer can take place from the literature were compared with those of a basic standard catamaran design, and were then used to assess novel designs. Critical issues at the monopile are, heave, surge, pitch, fender friction and bollard pull, for quartering and beam seas sway and roll are important. Heaveplates provide benefits, however increasing heave damping changes the principal fail condition from vertical slips to horizontal disconnects. Some of these failure cases could be predicted by vessel motion, which may be useful for a warning system. A vessel that can carry out transfers up to a 3.5m Hs was developed.en
dc.description.sponsorshipUniversity College Cork (Graduate Research Education Program in Engineering)en
dc.description.statusNot peer revieweden
dc.description.versionAccepted Version
dc.format.mimetypeapplication/pdfen
dc.identifier.citationShanley, M. 2018. Innovative hull design for servicing offshore wind turbines. PhD Thesis, University College Cork.en
dc.identifier.endpage256en
dc.identifier.urihttps://hdl.handle.net/10468/5793
dc.language.isoenen
dc.publisherUniversity College Corken
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Centres/12/RC/2302/IE/Marine Renewable Energy Ireland (MaREI) - The SFI Centre for Marine Renewable Energy Research/en
dc.rights© 2018, Matthew Shanley.en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/en
dc.subjectOffshore wind farm service vesselen
dc.subjectWFSVen
dc.subjectCTVen
dc.subjectO&Men
dc.subjectMIIen
dc.subjectP-Ploten
dc.subjectOffshoreen
dc.subjectWind farm service vesselen
dc.subjectCrew transfer vesselen
dc.subjectOperations and maintenanceen
dc.subjectOffshore wind energyen
dc.subjectMotion induced interruptionen
dc.subjectLevelised cost of energyen
dc.subjectMotion compensating gangwayen
dc.subjectOffshore renewable energy installationen
dc.subjectService operations vesselen
dc.subjectPerformance ploten
dc.thesis.opt-outfalse
dc.titleInnovative hull design for servicing offshore wind turbinesen
dc.typeDoctoral thesisen
dc.type.qualificationlevelDoctoral Degree (Structured)en
dc.type.qualificationnamePHD (Engineering)en
ucc.workflow.supervisorjimmy.murphy@ucc.ie
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