STRUCTURAL DAMPERS

Assumptions of the example:

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• Applied harmonic wind force:

1. Amplitude corresponds to 10m/s wind speed (based on real recorded data of similar wind turbines),

2. Frequency matches the natural frequency of the wind turbine​

• StruFlex adjustable pot bearings function as spring & damper semi-active devices (controlled by AI learing based algorithms).

• Assumption: the chosen stiffness coefficient reduces the lateral stiffness of the wind turbine by 17,5%

• Inherent damping ratio: 1%

• Adjacent graph:  wind-induced steady state lateral displacements with & without Struflex dampers (top blade tip)

 

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StruFlex (base) dampers - VS -  mass damper in the nacelle: ​​​

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• For 17,5% lateral stiffness reduction (spring setting) -> StruFlex dampers are as effective as a mass damper in the nacelle with mass ratio 2%​

• For 35% lateral stiffness reduction (spring setting) -> StruFlex dampers are as effective as a mass damper in the nacelle with mass ratio 5%

• For 50% lateral stiffness reduction (spring setting) -> StruFlex dampers are x1,5 more effective than a  mass damper in the nacelle with mass ratio 5%

• For 100% lateral stiffness reduction (spring setting) -> StruFlex dampers are x2 more effective than a mass damper in the nacelle with mass ratio 5%

• For 150% lateral stiffness reduction (spring setting) -> StruFlex dampers are x2,5 more effective than a mass damper in the nacelle with mass ratio 5%​​​​​​​​​​