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

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Author(s)
Pakrashi, Vikram 
O'Shea, Richard 
Jaksic, Vesna 
Murphy, Jimmy 
Uri
http://hdl.handle.net/10197/10413
Date Issued
09 July 2015
Date Available
13T10:47:01Z May 2019
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.
Sponsorship
Science Foundation Ireland
Other Sponsorship
Marine Research Energy Ireland (MaREI)
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 devices...

  • Energy generation

  • Model-free indicators...

  • Dynamic response cond...

  • Hurst exponent

  • Froude scaled waves

DOI
10.1088/1742-6596/628/1/012057
Language
English
Status of Item
Peer reviewed
ISSN
1742-6588
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Owning collection
Mechanical & Materials Engineering Research Collection
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Mar 26, 2023
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