Modelling the aeroelastic response of slender structures to vortex-induced vibrations: Industry transfer through full-scale experimental campaign at a wind turbine

Larger and taller wind turbines are characterized by larger tip masses and longer rotor-nacelle assembly (RNA) masts. Both result in a lower natural frequency, lowering the critical wind speed and increasing the likelihood of vortex resonance. While freestanding towers, such as stacks, have been extensively investigated for vortex-induced vibration (VIV), the completed wind turbine as a structure has not yet been fully investigated for VIV.

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Modelling the aeroelastic response of slender structures to vortex-induced vibrations for fatigue analysis

Slender structures subjected to vortex-induced vibrations experience an aeroelastic interaction in the lock-in range. The negative aerodynamic damping is the governing parameter for the onset of self-induced vibrations. However, available literature models still lack of a unified behaviour of the aerodynamic damping as a function of the oscillation. This is also reflected in codified methods to design slender structures in view of cross-wind actions.

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Like giant chimneys, they could one day rise into the sky - in desert regions, for example - and supply the world with electrical energy at virtually "zero cost". Against all the prophecies of doom, various groups of engineers around the world are now working to bring an ingenious idea out of the realm of visions and into the present - or at least into the near future - thanks to modern reinforced concrete construction and wind engineering technologies.

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