Vibration Control of Wind Turbine Towers using Active and Semi-Active Tuned Mass Dampers

摘要

Strategies for the vibration control of wind turbine towers are investigated numerically. First, the use of passive multiple TMDs (MTMDs) is examined. The WTT is subjected a power spectral density functions representing wind loading. Using a sequential search algorithm, the optimal number, location and tuning of the passive MTMDs are obtained. A control strategy for an active TMD is then proposed in order to improve the design of the passive TMD when the structural properties are not known. A control strategy for a semi-active variable stiffness TMD is also to reduce the control force in the system. Finally, the active and semi-active control strategies are incorporated with the multiple passive MTMD configuration and applied to a WTT subjected to a set of random excitations. It is shown that the active and semi-active approaches lead to greater vibration response, and that of these, the semi-active approach requires less power input.