Including load sequence effects in the fatigue damage estimation of an offshore wind turbine substructure

R.C. Dragt, J. Maljaars, J.T. Tuitman, Y. Salman, M.E. Otheguy

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)
4 Downloads (Pure)

Abstract

Retardation is a load sequence effect, which causes a reduced fatigue
crack growth rate after an overload is encountered. Retardation can be
cancelled when the overload is followed by an underload. The net
effect is beneficial to the fatigue lifetime of Offshore Wind Turbines
(OWTs). To be able to take this into account, computationally
demanding cycle-by-cycle approaches are required.
This paper presents a methodology which aims at reducing a very long
variable amplitude stress signal, such that it can be used to estimate the
cycle-by-cycle fatigue damage, without jeopardizing accuracy.
Filtering and reduction techniques are combined, based on typical
events seen in the loading pattern of an OWT, e.g. during a storm. The
effectiveness of the method is shown by comparing the number
Original languageEnglish
Title of host publicationProceedings of the 26th (2016) International Ocean and Polar Engineering Conference, 26 June - 1 July 2016, Rhodos, Greece
Place of Publications.l.
PublisherISOPE
Pages199-205
Number of pages6
ISBN (Print)978-1-880653-88-3
Publication statusPublished - 26 Jun 2016

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