Mitigation of monopile offshore wind turbines under wind and wave loading

Document Type

Conference Proceeding

Publication Date

1-1-2017

Abstract

Mitigation of fixed-bottom monopile offshore wind turbines subjected to wind and wave loading is studied in this paper. A semi-active tuned mass damper (STMD) with tunable natural frequency and damping ratio is utilized to mitigate the tower top dynamic response. Soil effects and damage are considered. Wind turbulence is generated via mapping a three dimensional wind field profile onto the rotating blades. Aerodynamic loading is computed using the Blade Element Momentum method where the Prandtl's tip loss factor and the Glauert correction are considered. Wave loading is computed using Morison's equation together with the strip theory. The National Renewable Energy Lab monopile 5 MW baseline wind turbine model is employed to examine the performance of the STMD. Results indicate that the STMD has significant effectiveness improvement over the passive TMD in mitigating the tower and foundation response under wind and wave loadings when soil effects and damage are considered.

Publication Source (Journal or Book title)

2017 Americas Conference on Wind Engineering, ACWE 2017

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