Abstract
This study investigates the lateral vibration control efficiency of toroidal tuned liquid column dampers (TTLCDs) for monopile supported offshore wind turbines. The TTLCD has the advantage that it can be tuned to match the natural frequencies of wind turbines both in fore-aft and side–side directions simultaneously. A general mathematical modeling of the TTLCD inside the nacelle is derived and an interface between the simulation platforms MATLAB/Simulink and FAST is established. A TTLCD design procedure is provided for monopile wind turbines. Numerical calculations are carried out for different wind velocities, wave-wind misalignment angles and working conditions considering fatigue and ultimate load cases. A parametric analysis is performed on the flow resistance coefficient of TTLCDs. The results demonstrate that TTLCDs can effectively control lateral vibrations and improve the structural performance of monopile wind turbines against wind and wave loads.
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