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. Decoupled load simulations are a computationallyefficient method to perform a dynamic analysis of an offshore wind turbine.Modelling the dynamic interactions between rotor and support structure,especially the damping caused by the rotating rotor, is of importance, sinceit influences the structural response significantly and has a major impact onestimating fatigue lifetime. Linear damping is usually used for this purpose,but experimentally and analytically derived formulas to calculate anaerodynamic damping ratio often show discrepancies to measurement andsimulation data. In this study decoupled simulation methods with reduced andfull rotor loads are compared to an integrated simulation. The accuracy ofdecoupled methods is evaluated and an optimization is performed to obtainaerodynamic damping ratios for different wind speeds that provide the bestresults with respect to variance and equivalent fatigue loads at distinctoutput locations. Results show that aerodynamic damping is not linear, butit is possible to match desired output using decoupled models. Moreover,damping ratios obtained from the empirical study suggest that aerodynamicdamping increases for higher wind speeds.

Decoupled simulations of offshore wind turbines with reduced rotor loads and aerodynamic damping