Frequency Domain Fatigue

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Offshore contractorWind turbine manufacturerDesign supportstructureIntegrated modelMetoceandataLoad caseswind & wavesH sT zTime domainfatigue checksnoOK?Fatigue checkresultsyesDone
Offshore: Frequency Domain• nat. freq.: 0.25 Hz• also fatigue driven• main loading: waves• Morison equation:• F=C d A u 2 + C m B u• Also non-linear!!
Page 1: Frequency DomainFatiguein the Desig
Page 4 and 5: Current method: Time Domain• load
Page 8 and 9: Offshore: Frequency Domainwavespect
Page 10 and 11: Frequency Domain Calculations• Ca
Page 12 and 13: New methodRequirement:• Leave con
Page 14 and 15: Tower modelling (1/2)F top• any F
Page 16 and 17: Frequency domain wind stressInputsp
Page 18 and 19: Tower modelling (2/2)• same FEM p
Page 20 and 21: Validation: Blyth• EU-project OWT
Page 22 and 23: Validation: Blyth• very good comp
Page 24 and 25: Design comparison: Egmond• wave s
Page 26 and 27: Conclusions• The method works!•

Frequency Domain Fatigue

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