A Delay Vector Variance based marker for an output-only assessment of structural changes in tension leg platforms

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dc.contributor.authorJaksic, Vesna
dc.contributor.authorWright, Christopher S.
dc.contributor.authorMandic, D. P.
dc.contributor.authorMurphy, Jimmy
dc.contributor.authorPakrashi, Vikram
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderMarine Renewable Energy Ireland
dc.date.accessioned2016-05-19T11:24:14Z
dc.date.available2016-05-19T11:24:14Z
dc.date.issued2015-07
dc.date.updated2015-07-24T23:08:14Z
dc.description.abstractAlthough aspects of power generation of many offshore renewable devices are well understood, their dynamic responses under high wind and wave conditions are still to be investigated to a great detail. Output only statistical markers are important for these offshore devices, since access to the device is limited and information about the exposure conditions and the true behaviour of the devices are generally partial, limited, and vague or even absent. The markers can summarise and characterise the behaviour of these devices from their dynamic response available as time series data. The behaviour may be linear or nonlinear and consequently a marker that can track the changes in structural situations can be quite important. These markers can then be helpful in assessing the current condition of the structure and can indicate possible intervention, monitoring or assessment. This paper considers a Delay Vector Variance based marker for changes in a tension leg platform tested in an ocean wave basin for structural changes brought about by single column dampers. The approach is based on dynamic outputs of the device alone and is based on the estimation of the nonlinearity of the output signal. The advantages of the selected marker and its response with changing structural properties are discussed. The marker is observed to be important for monitoring the as- deployed structural condition and is sensitive to changes in such conditions. Influence of exposure conditions of wave loading is also discussed in this study based only on experimental data.en
dc.description.sponsorshipMarine Renewable Energy Ireland (Grant No. 12/RC/2302); Science Foundation Ireland (SFI Advance Award 14/ADV/RC3022)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationJaksic V., Wright, C., Mandic, D. P., Murphy, J. and Pakrashi, V. (2015) 'A Delay Vector Variance based marker for an output-only assessment of structural changes in tension leg platforms', Journal of Physics: Conference Series, 628(1), 012059. doi: 10.1088/1742-6596/628/1/012059en
dc.identifier.doi10.1088/1742-6596/628/1/012059
dc.identifier.issn1742-6596
dc.identifier.issued1en
dc.identifier.journaltitleJournal of Physics: Conference Seriesen
dc.identifier.startpage012059en
dc.identifier.urihttps://hdl.handle.net/10468/2587
dc.identifier.volume628en
dc.language.isoenen
dc.publisherIOP Publishing Ltden
dc.relation.ispartof11th International Conference on Damage Assessment of Structures (DAMAS 2015)
dc.relation.urihttp://stacks.iop.org/1742-6596/628/i=1/a=012059
dc.rights© 2015, the Authors. Published under licence in Journal of Physics: Conference Series by IOP Publishing Ltd. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.en
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en
dc.subjectOffshore structureen
dc.subjectStructural health monitoringen
dc.subjectSignal processingen
dc.subjectDelay Vector Variance methoden
dc.titleA Delay Vector Variance based marker for an output-only assessment of structural changes in tension leg platformsen
dc.typeArticle (peer-reviewed)en
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