Effects of tower elasticity and aero-loading in aero-elastic-control- floater-mooring coupled dynamic analysis for a TLP-type FOWT
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Increasing numbers of floating offshore wind turbines are planned to be built in the coming years due to their high potential to generate massive amounts of clean energy from ocean-wind. In the present study, a numerical prediction tool has been developed for the coupled dynamic analysis of a FOWT (floating offshore wind turbine) system in time domain including aero-loading, blade-rotor dynamics and control, tower elasticity, mooring dynamics, and platform motions. A monocolumn TLP design with 5MW turbine is selected as an example case study. In case of the TLP type floater, it is seen that the interaction between an elastic tower and platform motion is very important in view of shifting natural frequencies and aero-dynamic excitations and damping. Those coupling effects can be clearly identified by comparing the elastic tower results with the rigid tower results. The developed technology and numerical tools are readily applicable to the design of any new FOWTs in any combinations of irregular waves, dynamic winds, and steady currents. Copyright 2012 by the International Society of Offshore and Polar Engineers (ISOPE).
