Aerodynamic Damping

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Variable speed turbines damping per blade element T' [N] 300 200 T' = 220.5*dVd + 0.05 100 0 -1.5 -1 -0.5 0 0.5 1 1.5 -100 -200 -300 dVd [m/s] T' [N] 800 600 400 T' = 326.5*dVd - 0.06 200 0 -2 -1 0 -200 1 2 -400 -600 -800 dVd [m/s] V = 12 m/s V = 23 m/s Van der Tempel’s method useful, but time consuming
Variable speed turbines damping entire turbine • Simplified closed-form ξ aero N ρ C m α ( V0) =Ω( V0) ⋅ 4 M ω • Van der Tempel’s method b L 1b 0 n ξ aero T′ 1 = ⋅ dV 2 M ω d 0 n
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 and 14: Constant speed turbines Van der Tem
Page 15: Variable speed turbines damping per
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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