Abstract
This paper presents an acausal modeling approach for developing a hydrodynamic module in the Control-oriented, Reconfigurable, and Acausal Floating Turbine Simulator (CRAFTS), a wind turbine simulation tool being developed by the authors, to facilitate control co-design of floating offshore wind turbines (FOWTs). The available data of the semi-submersible VolturnUS-S FOWT is incorporated into the modeling, simulation, and control demonstrations. The model is verified and validated using numerical data from industrial-standard simulation platform OpenFAST and experimental data from the Floating Offshore-wind and Controls Advanced Laboratory (FOCAL) Project. Numerical results demonstrate that the hydrodynamic module in CRAFTS can qualitatively capture loads and responses from the free decay tests, as well as the stabilizing effects of the tuned mass dampers (TMDs), which are tuned to attenuate the platform pitch resonance or the tower bending resonance.
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