Scale-model experiments on floating wind turbine platforms

The dynamic response of floating wind turbines is studied through scale-model experiments. Froude-scaled models (100:1) placed in a water flume are exposed to periodic waves at moderate amplitude. The response of both tension leg platforms (TLP) and spar buoy models is studied through accelerometer, inclinometer, and video measurements with a wireless data acquisition system. The effect of wave frequency, wave height and tether pretension on response amplitude operators for pitch, surge, and heave motions for both tension leg and spar buoy platforms are determined. It is shown that surge motion of the platform dominates other motions for both the tension leg platform and spar buoy, and varying tether pretension has little effect on response amplitude operator values. The present experimental results can be used to validate the hydrodynamic kernels of linear frequency-domain models, time-domain dynamics models, and computational simulations on floating wind turbines.

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