Dynamic response signatures of a scaled model platform for floating wind turbines in an ocean wave basin

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Title: Dynamic response signatures of a scaled model platform for floating wind turbines in an ocean wave basin
Authors: Jaksic, VesnaO'Shea, RichardCahill, PaulPakrashi, Vikramet al.
Permanent link: http://hdl.handle.net/10197/10820
Date: 28-Feb-2015
Online since: 2019-07-01T12:05:22Z
Abstract: Understanding of dynamic behaviour of offshore wind floating substructures is extremely important in relation to design, operation, maintenance and management of floating wind farms. This paper presents assessment of nonlinear signatures of dynamic responses of a scaled tension leg platform (TLP) in a wave tank exposed to different regular wave conditions and sea states characterised by the Bretschneider, the Pierson-Moskowitz, and the JONSWAP spectra. Dynamic responses of the TLP was monitored at different locations using load cells, camera based motion recognition system, and Laser Doppler Vibrometer. The analysis of variability of the TLP responses and statistical quantification of their linearity or nonlinearity, as non-destructive means of structural monitoring from output only condition, remains a challenging problem. In this study, the Delay Vector Variance (DVV) method is used to statistically study the degree of nonlinearity of measured response signals from TLP. DVV is observed to create a marker estimating the degree to which a change in signal nonlinearity reflects real time behaviour of the structure, and also to establish the sensitivity of the instruments employed to these changes. The findings can be helpful in establishing monitoring strategies and control strategies for undesirable levels or types of dynamic response, and can help better estimating changes in system characteristics over the life-cycle of the structure.
Type of material: Journal Article
Publisher: The Royal Society
Journal: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume: 373
Issue: 2035
Start page: 20140078
Copyright (published version): 2015 the Authors
Keywords: Offshore wind energyTension leg platformStructural dynamicsDelay vector varianceSignal nonlinearity
DOI: 10.1098/rsta.2014.0078
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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