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. A model for Quick Load Analysis of Floating wind turbines (QuLAF) ispresented and validated here. The model is a linear, frequency-domain,efficient tool with four planar degrees of freedom: floater surge, heave,pitch and first tower modal deflection. The model relies on state-of-the-arttools from which hydrodynamic, aerodynamic and mooring loads are extractedand cascaded into QuLAF. Hydrodynamic and aerodynamic loads are pre-computedin WAMIT and FAST, respectively, while the mooring system is linearizedaround the equilibrium position for each wind speed using MoorDyn. Anapproximate approach to viscous hydrodynamic damping is developed, and theaerodynamic damping is extracted from decay tests specific for each degree offreedom. Without any calibration, the model predicts the motions of thesystem in stochastic wind and waves with good accuracy when compared to FAST.The damage-equivalent bending moment at the tower base is estimated witherrors between 0.2  % and 11.3  % for all the load casesconsidered. The largest errors are associated with the most severe waveclimates for wave-only conditions and with turbine operation around ratedwind speed for combined wind and waves. The computational speed of the modelis between 1300 and 2700 times faster than real time.

An efficient frequency-domain model for quick load analysis of floating offshore wind turbines