Fatigue Analysis of a Point Absorber WEC subjected to Passive and Reactive Control

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Abstract

This paper investigates the effect of a passive and reactive control mechanism on the accumulated fatigue damage of a wave energy converter (WEC). Interest is focused on four structural details of the Wavestar arm which is used as a case study here. The fatigue model is set up as an independent and generic toolbox which can be applied to any other global response model of a WEC device combined with a control system. The stress responses due to the stochastic wave loads are computed by a FEM model using the frequency-domain approach. The fatigue damage is calculated based on the spectral-based fatigue analysis in which the fatigue is described by the given spectral moments of the stress response. The question will be discussed, which control case is more favorable regarding the trade off between fatigue damage reduction and increased power production.
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Details

This paper investigates the effect of a passive and reactive control mechanism on the accumulated fatigue damage of a wave energy converter (WEC). Interest is focused on four structural details of the Wavestar arm which is used as a case study here. The fatigue model is set up as an independent and generic toolbox which can be applied to any other global response model of a WEC device combined with a control system. The stress responses due to the stochastic wave loads are computed by a FEM model using the frequency-domain approach. The fatigue damage is calculated based on the spectral-based fatigue analysis in which the fatigue is described by the given spectral moments of the stress response. The question will be discussed, which control case is more favorable regarding the trade off between fatigue damage reduction and increased power production.
Original languageEnglish
Article numberOMAE-14-1007
JournalJournal of Offshore Mechanics and Arctic Engineering
Volume137
Issue number5
Pages (from-to)051901-051901-12
Number of pages12
ISSN0892-7219
DOI
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes
EventASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering - San Francisco, CA, United States
Duration: 8 Jun 201413 Jun 2014

Conference

ConferenceASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
CountryUnited States
CitySan Francisco, CA
Period08/06/201413/06/2014

    Research areas

  • Wave energy converter, Point absorber, Fatigue analysis
ID: 215424216