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

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Title: The Hurst exponent as an indicator of the behaviour of a model monopile in an ocean wave testing basin
Authors: Pakrashi, Vikram
O'Shea, Richard
Jaksic, Vesna
Murphy, Jimmy
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Date: 9-Jul-2015
Online since: 2019-05-13T10:47:01Z
Abstract: With 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.
Funding Details: Science Foundation Ireland
Type of material: Journal Article
Publisher: IOP Publishing
Journal: Journal of Physics: Conference Series
Volume: 628
Issue: 1
Copyright (published version): 2015 the Authors
Keywords: Wind and wave devicesEnergy generationModel-free indicatorsDynamic response conditionsHurst exponentFroude scaled waves
DOI: 10.1088/1742-6596/628/1/012057
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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