Fatigue damage assessment of fixed offshore wind turbine tripod support structures
The objective of this work is to carry out a fatigue damage assessment of a fixed offshore wind turbine support structure due to combined wave and wind - induced loading. Considering the operational mode of the wind turbine 3 loading conditions are identified and for each loading condition 4 critica...
| Published in: | Engineering Structures |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
2015
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| Subjects: | |
| Online Access: | https://vbn.aau.dk/da/publications/c3105ac2-7fae-4d74-9692-81d7a7bc33f8 https://doi.org/10.1016/j.engstruct.2015.07.038 http://www.scopus.com/inward/record.url?scp=84939187309&partnerID=8YFLogxK |
| Summary: | The objective of this work is to carry out a fatigue damage assessment of a fixed offshore wind turbine support structure due to combined wave and wind - induced loading. Considering the operational mode of the wind turbine 3 loading conditions are identified and for each loading condition 4 critical regions located in different zones of the supporting structure are studied. The stress transfer function is obtained by carrying out dynamic finite element analysis in the frequency domain. A wave scatter diagram of the North Atlantic is used in order to account for the environmental effects. The stress transfer function is formulated such that a sufficient number of frequencies can be used in the Inverse Fast Fourier Transform with random phase angles in order to obtain the stress time histories. An up-to-date rainflow cycle counting method is adopted to count the total number of cycles related to stress range bins. The S-N approach is employed to estimate fatigue damage. |
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