Lateral vibration control of monopile supported offshore wind turbines with toroidal tuned liquid column dampers

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.

Automated summary

This study investigates the efficiency of toroidal tuned liquid column dampers (TTLCDs) in controlling the lateral vibration of monopile supported offshore wind turbines. The TTLCDs are capable of simultaneously matching the natural frequencies of the wind turbines in both fore-aft and side-side directions. A mathematical model of the TTLCDs inside the nacelle is derived and a simulation interface between MATLAB/Simulink and FAST is established. A design procedure for TTLCDs in monopile wind turbines is provided. Numerical calculations are performed considering different wind velocities, wave-wind misalignment angles and working conditions, taking into account fatigue and ultimate load cases. A parametric analysis is conducted 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.