Offshore wind turbines are growing in popularity due to the steady, high speed and environment friendly offshore wind resources. However, the wind and wave excitations can result in excessive vibration and hence destroying the structural integrity. To avoid this, the inerter-based vibration absorber, which is a reaction mass connected to the system with the combinations of springs, dampers and inerters, is employed in this study to suppress the vibration. Both monopile and spar-buoy offshore wind turbines are investigated in this paper by establishing limited degree-of-freedom models based on FAST. The structure-immittance approach is used to obtain the optimal absorber configurations with corresponding element values, by minimising the standard deviation of the tower top displacement. It will be shown that compared with the traditional tuned mass damper, the performance of the inerter-based absorber is superior. Moreover, with the same performance as the tuned mass damper, the mass of the inerter-based absorber can be significantly reduced.
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