Publications

Bagbanci, H., Karmakar, D. and Guedes Soares, C. (2015), “Comparison of spar and semisubmersible floater concepts of offshore wind turbines using long-term analysis”, Journal of Offshore Mechanics and Arctic Engineering, Vol. 137, pp. 061601-1 - 061601-10

The long-term probability distributions of a spar-type and a semi-submersible type offshore floating wind turbine response are calculated for surge, heave and pitch motions, and also for side-to-side, fore-aft and yaw tower base bending moments. The transfer functions for surge, heave and pitch motions for both spar-type and semi-submersible type floaters are obtained using the FAST code and the results are also compared with the results obtained in an experimental study. The long-term predictions of the most probable maximum values of motion amplitudes are used for design purposes, so as to guarantee the safety of the floating wind turbines against overturning in high waves and wind speed. The long-term distribution is carried out using North Atlantic wave data and the short term floating wind turbine responses are represented using Rayleigh distributions. The transfer functions are used in the procedure to calculate the variances of the short term responses. The results obtained for both spar-type and semi-submersible type offshore floating wind turbine is compared and the present study will be helpful in the assessments of the long-term availability and economic performance of the spar-type and semi-submersible type offshore floating wind turbine.

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