Publicações

Nava, V., Bagbanci, H., Guedes Soares, C. e Arena, F. (2013), "On the response of a spar floating wind turbine under the occurrence of extreme events", 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2013), 9-14 June, Nantes, France

This paper is aimed at showing the accuracy of a Quasi-Deterministic approach for the determination of the responses of a floating spar-type wind turbine in the time domain subject to joint wind and wave excitations. Especially during the first stages of design, quick and reliable analyses may be needed and carried out by designers in order to figure out the assumptive loadings acting under the occurrence of extreme events and thus proceeding promptly with the sizing of such devices. Quasi-Deterministic (Boccotti, early ‘80s) approaches have been followed since their first applications in the determination of loadings induced by sea waves; recently they have been also adopted for the determination of responses of marine floating structures under the action of sea waves. In this paper, the quasi-determinism theory is applied for the first time for the computation of forces jointly generated from wind and waves. A coupled 3-degree-of-freedom (3-dofs) model of a floating spar-type 5 MW wind turbine is herein studied subject to wind and waves under the occurrence of several wind and sea conditions. Numerical simulations of forces in the time domain are carried out using FAST software, taking into account the hydrodynamic characteristics of the floater obtained in the frequency domain by WAMIT through panel method. Equations of motion are integrated by means of a Runge Kutta routine and time histories and statistics of responses of the model are calculated. Further, a quasi-deterministic approach is followed in order to predict the responses under the occurrence of extreme (low probability, given a fixed sea state) events and results finally compared with those obtained from the more time-consuming numerical simulations.

Pode descarregar esta publicacao de: https://asmedigitalcollection.asme.org/OMAE/proceedings-abstract/OMAE2013/55423/V008T09A070/271701

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