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Influence of superelement support structure modeling on the loads on an offshore wind turbine with a jacket support structure

: Tu, Y.; Vorpahl, F.

Journal of Ocean and Wind Energy : JOWE 1 (2014), Nr.3, S.153-160
ISSN: 2310-3604
Bundesministerium für Umwelt, Naturschutz, Bau und Reaktorsicherheit BMUB
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Fraunhofer IWES ()
Offshore wind turbine; ADCoS-Offshore; jacket; support structure; coupled simulation; joint flexibility; superelement

In aero-hydro-servo-elastic tools used for load simulations of offshore wind turbines (OWTs), the joint flexibilities of the support structures are generally not modeled in detail. This may lead to lower accuracy of the resulting loads. In this study, the influence of a superelement modeling approach (which includes the modeling of detailed joints) compared to the formerly-used beam modeling approach on the simulated loads is investigated based on a generic 5-MW OWT with a jacket support structure. To confirm the feasibility of the superelement approach, the mass and eigenfrequencies of the beam and superelement jacket models are compared to those of a reference shell model. A static analysis is conducted to pre-check the different load-bearing behaviors of the two models. Time-domai n simulations are conducted with the software ADCoS-Offshore, using a reduced fatigue load case set with two complete OWT models that include beam and superelement jackets, respectively, and the results are analyzed. Conclusions are drawn regarding the necessary model fidelity for the simulations of this type of OWT under the given conditions.