Bi-directional vibration control of offshore wind turbines using a 3D pendulum tuned mass damper

• Published in: Mechanical systems and signal processing Vol. 105; pp. 338 - 360
• Main Authors: Sun, C., Jahangiri, V.
• Format: Journal Article
• Language: English
• Published: Berlin Elsevier Ltd 15.05.2018; Elsevier BV
• Subjects: 3-D technology; Aerodynamic loads; Aerodynamics; Bi-directional vibration control; Computation; Dynamic response; Earthquake dampers; Mathematical models; Misalignment; Offshore wind turbines; Pendulum tuned mass damper; Seismic engineering; Seismic response; Studies; Turbines; Vibration; Vibration control; Vibration isolators; Vortex-induced vibrations; Wave power; Wind turbines; Wind-wave misalignment; Pendulum tuned mass damper; Bi-directional vibration control; Offshore wind turbines; Wind-wave misalignment
• ISSN: 0888-3270; 1096-1216
• DOI: 10.1016/j.ymssp.2017.12.011

•An analytical model of an offshore wind turbine with a three dimensional pendulum tuned mass damper has been established.•The optimum design formula of the three dimensional pendulum tuned mass damper is proposed.•The pendulum damper outperforms dual linear tuned mass dampers in mitigating the bi-directional vibration of the nacelle. Offshore wind turbines suffer from excessive bi-directional vibrations due to wind-wave misalignment and vortex induced vibrations. However, most of existing research focus on unidirectional vibration attenuation which is inadequate for real applications. The present paper proposes a three dimensional pendulum tuned mass damper (3d-PTMD) to mitigate the tower and nacelle dynamic response in the fore-aft and side-side directions. An analytical model of the wind turbine coupled with the 3d-PTMD is established wherein the interaction between the blades, the tower and the 3d-PTMD is modeled. Aerodynamic loading is computed using the Blade Element Momentum method where the Prandtls tip loss factor and the Glauert correction are considered. JONSWAP spectrum is adopted to generate wave data. Wave loading is computed using Morisons equation in collaboration with the strip theory. Via a numerical search approach, the design formula of the 3d-PTMD is obtained and examined on a National Renewable Energy Lab (NREL) monopile 5 MW baseline wind turbine model under misaligned wind, wave and seismic loading. Dual linear tuned mass dampers (TMDs) deployed in the fore-aft and side-side directions are utilized for comparison. It is found that the 3d-PTMD with a mass ratio of 2% can improve the mitigation of the root mean square and peak response by around 10% when compared with the dual linear TMDs in controlling the bi-directional vibration of the offshore wind turbines under misaligned wind, wave and seismic loading.