Decoupled simulations of offshore wind turbines with reduced rotor loads and aerodynamic damping
2017
Abstract. Decoupled load simulations are a computationally
efficient 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, since
it influences the structural response significantly and has a major impact on
estimating fatigue lifetime. Linear damping is usually used for this purpose,
but experimentally and analytically derived formulas to calculate an
aerodynamic damping ratio often show discrepancies to measurement and
simulation data. In this study decoupled simulation methods with reduced and
full rotor loads are compared to an integrated simulation. The accuracy of
decoupled methods is evaluated and an optimization is performed to obtain
aerodynamic damping ratios for different wind speeds that provide the best
results with respect to variance and equivalent fatigue loads at distinct
output locations. Results show that aerodynamic damping is not linear, but
it is possible to match desired output using decoupled models. Moreover,
damping ratios obtained from the empirical study suggest that aerodynamic
damping increases for higher wind speeds.
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