Comparison of different approaches to load calculation for the OWEC Quattropod jacket support structure

The Science of Making Torque from Wind 2012

Zwick, D.^1 ; Schafhirt, S.^1 ; Brommundt, M.^1 ; Muskulus, M.^1 ; Narasimhan, S.^2 ; Mechineau, J.^2 ; Haugsøen, P.B.^2

Department of Civil and Transport Engineering, Norwegian University of Science and Technology, Høgskoleringen 7a, Trondheim

7491, Norway^1

OWEC Tower AS, Storetveitvegen 96, Bergen

5072, Norway^2

关键词: Accurate analysis;    Detailed models;    Equivalent beam model;    Integrated analysis;    Load calculation;    Power production;    Sequential analysis;    Support structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/555/1/012110/pdf
DOI  :  10.1088/1742-6596/555/1/012110

来源: IOP

【 摘 要 】

Accurate load simulations are necessary in order to design cost-efficient support structures for offshore wind turbines. Due to software limitations and confidentiality issues, support structures are often designed with sequential analyses, where simplified wind turbine and support structure models replace more detailed models. The differences with an integrated analysis are studied here for a commercial OWEC Quattropod. Integrated analysis seems to generally predict less damage than sequential analysis, decreasing by 30-70 percent in two power production cases with small waves. Additionally it was found that using a different realization of the wave forces for the retrieval run in sequential analysis leads to an increase of predicted damage, which can be explained as the effect of applying two independent wave force series at the same time. The midsection of the detailed support structure model used shell elements. Additional analyses for a model with an equivalent beam model of the midsection showed only small differences, mostly overpredicting damage by a few percent. Such models can therefore be used for relatively accurate analysis, if carefully calibrated.