The Hurst exponent as an indicator of the behaviour of a model monopile in an ocean wave testing basin

dc.contributor.authorPakrashi, Vikram
dc.contributor.authorO'Shea, Richard
dc.contributor.authorJaksic, Vesna
dc.contributor.authorMurphy, Jimmy
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderMarine Renewable Energy Ireland
dc.description.abstractWith the importance of renewable energy well-established worldwide, and targets of such energy quantified in many cases, there exists a considerable interest in the assessment of wind and wave devices. While the individual components of these devices are often relatively well understood and the aspects of energy generation well researched, there seems to be a gap in the understanding of these devices as a whole and especially in the field of their dynamic responses under operational conditions. The mathematical modelling and estimation of their dynamic responses are more evolved but research directed towards testing of these devices still requires significant attention. Model-free indicators of the dynamic responses of these devices are important since it reflects the as-deployed behaviour of the devices when the exposure conditions are scaled reasonably correctly, along with the structural dimensions. This paper demonstrates how the Hurst exponent of the dynamic responses of a monopile exposed to different exposure conditions in an ocean wave basin can be used as a model-free indicator of various responses. The scaled model is exposed to Froude scaled waves and tested under different exposure conditions. The analysis and interpretation is carried out in a model-free and output-only environment, with only some preliminary ideas regarding the input of the system. The analysis indicates how the Hurst exponent can be an interesting descriptor to compare and contrast various scenarios of dynamic response conditions.en
dc.description.sponsorshipMarine Renewable Energy Ireland (Grant No. 12/RC/2302); Science Foundation Ireland (SFI Advance Award 14/ADV/RC3022); PhD Scholarship (R13570)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.identifier.citationPakrashi, V., O'Shea, R., Jaksic, V. and Murphy, J. (2015) 'The Hurst exponent as an indicator of the behaviour of a model monopile in an ocean wave testing basin', Journal of Physics: Conference Series, 628 (1), 012057. doi: 10.1088/1742-6596/628/1/012057en
dc.identifier.journaltitleJournal of Physics: Conference Seriesen
dc.publisherIOP Publishing Ltden
dc.relation.ispartof11th International Conference on Damage Assessment of Structures (DAMAS 2015)
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.subjectOffshore structureen
dc.subjectTank testingen
dc.subjectMonopile foundationsen
dc.titleThe Hurst exponent as an indicator of the behaviour of a model monopile in an ocean wave testing basinen
dc.typeArticle (peer-reviewed)en
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