Publications

Nava, V., Guedes Soares, C. and Arena, F. (2014), “On the assessment of extreme forces on a floating spar wind”, Developments in Maritime Transportation and Exploitation of Sea Resources, 2014, Guedes Soares, C. and López Peña F. (Eds.). Francis & Taylor Group, London, UK, pp. 933-942.

A model based on the Quasi-Determinism theory is used in this paper to evaluate the most probable extreme excitations and their time histories on a 3-degree-of-freedom (i.e. surge, heave and pitch rotation) model of a floating spar-type 5 MW wind turbine. Numerical simulations of forces in the time domain on the hull and pile of the structure have been carried out using FAST software, accounting for the hydrodynamic characteristics of the floater obtained by means of WAMIT. Sea wave forces and joint wave and wind forces have been calculated, under the hypothesis of typical wave and wind power density functions. In particular, different case studies have been chosen accounting for operational and typical conditions of significant wave height and wind speed in a site in the Atlantic Ocean. An approach based on the Quasi-determinism theory is then used in order to assess, for each case study, the time history of all the components of the excitations when the maximum of one component of the forces occurs. Studies about the validity of the model and the qualitative and quantitative anomaly of the simulations with respect to the herein presented approach are also included.

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