Simulation of TMD vibration control for offshore monopile wind turbine structures under combined wind and ice loads
In cold regions,offshore wind turbine structures are susceptible to complex environmental loads,which can lead to vibration-related safety concerns.Taking a 6.45 MW offshore monopile wind turbine structure as an example,the vibration response of the structure under the combined action of wind and ice loads is analyzed and compared before and after the implementation of the MTMD(Multiple Tuned Mass Damper)system.The results indicate that the wind and ice loads induce severe vibration responses in the wind turbine tower,with the maximum displacement response occurring at the top of the tower and the maximum acceleration response near the amplitude point of the second mode of vibration.In addition to the first two natural frequencies,the wind and ice loads also excite higher-order responses in the tower structure.By employing an MTMD system that controls the first and second mode frequencies,the displacement,acceleration,and overturning moment responses of the tower structure can be effectively controlled,resulting in significant vibration reduction.However,it should be noted that the TMD(Tuned Mass Damper)device exhibits frequency sensitivity and cannot effectively mitigate vibration responses induced by higher-order frequencies of the structure.
wind-ice load combinationoffshore wind turbinemultiple tuned mass damper(MTMD)vibration control
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