Author(s): Zhu Benrui; Liu Yihai; Huang Yan
Linked Author(s):
Keywords: Offshore wind turbines; Frequency lock-in; Inerter; Pendulum tuned mass damper; Ice-induced vibration; Vibration mitigation
Abstract: Offshore wind turbines (OWTs) are highly susceptible to ice-induced vibration (IIV). Accurate prediction of ice–structure interaction and effective mitigation of IIV are critical for the safe and reliable operation of OWTs in ice‑prone marine environments. This paper proposes an inerter‑pendulum tuned mass damper (I‑PTMD) to suppress vibrations of monopile‑supported OWTs under combined actions of moving sea ice and fluctuating wind loads. To this end, the governing equations of motion are derived for a 16‑degree‑of‑freedom (16‑DOF) monopile OWT system integrated with the I‑PTMD. Turbulent wind fields are generated using Turbsim, and aerodynamic loads are computed via the Blade Element Momentum (BEM) theory. The dynamic interaction between drifting sea ice and the OWT substructure is simulated using the Hendrikse ice model. Numerical results demonstrate that the I‑PTMD effectively attenuates frequency lock‑in vibrations of the monopile OWT. Furthermore, the proposed damper outperforms the 3D‑PTMD in damping efficiency while requiring a considerably smaller operational stroke.
Year: 2026