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Publications
Yeter, B., Garbatov, Y. and Guedes Soares, C. (2017), “Risk-based multi-objective optimisation of a monopile offshore wind turbine support structure”, Proceedings of the ASME 2016 36th International Conference on Ocean, Offshore and Arctic Engineering (OMAE17), 25-30 June, Trondheim, Norway
The present work carries out a multi-objective design optimization of a monopile offshore wind turbine support structure. Three objective functions are created employing the minimization of the fatigue damage, permissible stress ratio, and the total construction cost of the monopile support structure taking into account the costs associated with welding and labor. The constructional limitations in the offshore industry take into consideration in the selection of the upper boundaries of the design variables. The reliability index is employed to identify the topology of the structure as a part of the Pareto frontier solution in reducing the failure probability for the critical limit states and satisfying the target reliability level. The risk-based assessment of the optimal designs is performed to be integrated into the optimization in the life-cycle cost assessment. The ultimate optimization target is deemed to be the minimization of the levelised cost of energy, which is estimated based on the discounted cash-flow method considering the life-cycle costs constituting CAPEX and OPEX.
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