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V.A.Riziotis and S.G.Voutsinas

NTUA. Advanced Aeroelastic Modeling of Complete Wind Turbine Configuration in View of Assessing Stability Characteristics. V.A.Riziotis and S.G.Voutsinas National Technical University of Athens School of Mechanical Engineering Fluids Section. Overview of the Presentation.

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V.A.Riziotis and S.G.Voutsinas

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  1. NTUA Advanced Aeroelastic Modeling of Complete Wind Turbine Configuration in View of Assessing Stability Characteristics V.A.Riziotis and S.G.Voutsinas National Technical University of Athens School of Mechanical Engineering Fluids Section EWEC’06 Athens 27 February-2 March 2006

  2. Overview of the Presentation

  3. Excitation Method Non-linear damping identification • wind turbine modes are excited, • by individual blade pitch (rotor modes and tower fore aft mode) • by point force applied at tower top (tower modes) • duration of excitation 15sec • pitch amplitude 2o • tower force amplitude 2.5 ton • damping extracted from transient loads time-series 5 rev 15 s

  4. Δt Δt t0 -ζ Ωn Damping Identification Methods moving block method

  5. 900 phase shift Damping Identification Methods Hilbert method A(t): envelope signal

  6. Comparison with Measurements 1st tower lateral bending

  7. Comparison with Measurements 1st tower longitudinal bending

  8. Comparison with Measurements reduction of damping beyond 16m/s is associated with the inability of the damping identification method to predict well the damping of spectrally close modes

  9. Comparison with Measurements r/R = 0.40 r/R = 0.85

  10. Comparison with Measurements 1st regressive rotor lead-lag

  11. Comparison with Measurements 1st progressive rotor lead-lag

  12. Comparison of damping Identification Methods 1st tower lateral bending 1st tower longitudinal bending

  13. 12 m/s 16 m/s Comparison of damping Identification Methods

  14. Conclusions

  15. Acknowledgements • European Commission for funding this work under contract NNK5-CT2002-00627 (STABCON project) • STABCON project partners for publishing of the paper

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