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
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 language | English |
|---|---|
| Title of host publication | Proceedings of the 26th (2016) International Ocean and Polar Engineering Conference, 26 June - 1 July 2016, Rhodos, Greece |
| Place of Publication | s.l. |
| Publisher | ISOPE |
| Pages | 199-205 |
| Number of pages | 6 |
| ISBN (Print) | 978-1-880653-88-3 |
| Publication status | Published - 26 Jun 2016 |