An improved inerter-pendulum tuned mass damper and its application in monopile offshore wind turbines

Document Type

Article

Publication Date

4-15-2024

Abstract

This paper proposes an improved inerter-pendulum tuned mass damper (I-PTMD) to combine the advantages of an inerter unit and the PTMD for bi-directional vibration control. To achieve this objective, two types of I-PTMD, namely SI (series inerter)-PTMD and PSI (series-parallel inerter)-PTMD are developed. The optimal design parameters of the SI-PTMD and PSI-PTMD are derived using the Imperial Competition Algorithm (ICA). Performance of the two types of I-PTMDs are examined via mitigating a single degree-of-freedom system. It is found that the PSI-PTMD outperforms the SI-PTMD in expanding the effective tuning frequency range and enhancing the mitigation effect. To further evaluate the performance of the PSI-PTMD, the National Renewable Energy Lab (NREL) monopile 5 MW baseline offshore wind turbine (OWT) is employed. A 16-DOF(degree-of-freedom) analytical model of the monopile OWT with a PSI-PTMD is established. The generalized aerodynamic, hydrodynamic and seismic loading are derived based on virtual work principle. Research results show that the PSI-PTMD outperforms the traditional PTMD in mitigating the bi-directional responses of the OWT under multi-hazard conditions.

Publication Source (Journal or Book title)

Ocean Engineering

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