Control of wind/wave-induced vibrations of jacket-type offshore wind turbines through tuned liquid column gas dampers

Wind/wave-induced vibrations of jacket-type offshore wind turbines (JOWTs) are suppressed by placing a passive vibration absorber, called tuned liquid column gas damper (TLCGD), on the turbine nacelle. Adopting an ensemble of 75 wind/wave combinations, three different JOWTs and a SimuLink-based nonlinear model in time domain, main parameters of the TLCGD are optimised to reach the minimum standard deviation of nacelle displacement. Obtained results indicate that contribution of the proposed TLCGD is more pronounced in the case of regular excitations such as those from sea waves and less turbulent winds. Depending on the wind/wave combination, TLCGD can result in reductions up to 45% and 51% in nacelle displacement standard deviation and maximum acceleration, respectively. As a result, TLCGD deemed to be well suited to protect fatigue critical JOWTs as well as acceleration-sensitive devices of the nacelle.