Abstract
To relieve response of OWTs, this paper investigates the application of fore–aft tuned mass damper (TMD) in nacelle/tower for passive control. Considering flexibility of key components, system-TMD coupled algorithm is proposed based on the multi-body dynamics theory for a monopile offshore wind turbine. Hereby the improved artificial fish swarm algorithm is applied to optimize parameters and installation location of a TMD in terms of dynamic response and modal analysis. The results show that when TMD inherent frequency approximates the first-order inherent frequency of the tower front/back bending moment, vibration reduces to the maximum extent, so does the nacelle acceleration in the frequency domain; optimal installation location is within 0~1 m away from the center of the tower top-nacelle connection toward the front end of the nacelle; and the TMD after parameter optimization may function to reduce the tower top displacement by 68.30% under the shutdown condition.
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