Achieving substantial reductions in Levelized Cost of Energy (LCOE) of floating wind turbines (FWTs) requires robust reliability assessment that accounts for inherent design uncertainties. A key aspect of such reliability assessment is the definition of limit states. In this regard, load effects need to be evaluated accurately. This paper presents a computational framework for evaluating load effects on FWT support structures. The computed load effect is subsequently characterized. A high fidelity finite element model of the National Renewable Energy Laboratory (NREL) 5MW reference turbine mounted on the OC3-Hywind spar buoy was developed and validated for this purpose. The loads from fully coupled time domain aero-hydro-servo-elastic simulations are transferred for detailed finite element (FE) load effect computation in Abaqus. Matlab® and Python are used as the computational tools for automating the whole analysis from start to finish. The initial part of this study addresses the amount of run-in-time to be excluded from response statistics. Based on convergence studies carried out, recommendations are made for run-in-time to be excluded from response statistics. The maximum von Mises stress in the tower as a measure of yielding is the load effect investigated in this study.
|Journal||Journal of Physics: Conference Series|
|Early online date||24 Oct 2019|
|Publication status||Published - 2019|
|Event||16th Deep Sea Offshore Wind R&D conference - Radisson Blu Royal Garden Hotel, Trondheim, Norway|
Duration: 16 Jan 2019 → 18 Jan 2019
Okpokparoro, S., & Sriramula, S. (2019). Stochastic load effect characterization of floating wind turbine support structures. Journal of Physics: Conference Series, 1356(1), . https://doi.org/10.1088/1742-6596/1356/1/012013