Aerodynamic Damping

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Constant speed turbine Opti-OWECS aerodynamic damping ratio [%] 6 5 4 3 2 1 0 0 5 10 15 20 25 30 mean wind speed at hub [m/s] Simplified closed-form Van der Tempel Kühn numerical linearization Kühn free vibration Kühn closed-form
Variable speed turbines damping per blade element Differences compared to constant speed: • Tip speed ratios • Angels of inflow Changes in damping due to: • Variable rotor speed • Drag term less damping (up to 25%) more damping (up to 16%) Garrad formula useful, but consider inaccuracy
Page 1 and 2: Aerodynamic Damping in the Design o
Page 3 and 4: Aerodynamic Damping relative wind s
Page 5 and 6: Aerodynamic Damping • Fore-aft mo
Page 7 and 8: Frequency Domain Calculations wave
Page 9 and 10: Frequency Domain Calculations respo
Page 11 and 12: Constant speed turbines Garrad Assu
Page 13: Constant speed turbines Van der Tem
Page 17 and 18: Variable speed turbines damping ent
Page 19 and 20: Variable speed turbines damping tur
Page 21 and 22: Variable speed turbines damping tur
Page 23 and 24: Evaluation aerodynamic damping rati

Aerodynamic Damping

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