Frequency Domain Fatigue

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Tower modelling (2/2)• same FEM program• select 1 or several spots• make transfer function for wave loadagain:aerodynamic dampingTRF tower top load tomudline bending stress [(N/m 2 )/N]7000600050004000300020001000TRF without aerodynamic dampingTRF with aerodynamic damping00 0.5 1 1.5 2<strong>Frequency</strong> [Hz]
CombiningwavespectrumS(f )fS(f )fwindspectrumtransferfunctionˆ σˆ ζfˆ σVˆwindftransferfunctionresponsespectrumS σ(f )f+S σ(f )fresponsespectrumS σ(f )f
Page 1: Frequency DomainFatiguein the Desig
Page 4 and 5: Current method: Time Domain• load
Page 6 and 7: Offshore contractorWind turbine man
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 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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