A box-type floating structure is considered for a candidate of floating wind turbine structures. The platform is consisted of a box structure and large damping plates for enhancing global performance characteristics. Numerical analysis is conducted by using higher-order boundary element method. The numerical results were validated through a series of convergence test and model tests data. The global performance of the model structure is compared with same class spar-type structure. Finally technical feasibility of the structure is discussed considering construction cost and installation procedure.


Offshore floating wind turbine has been paid attention due to better quality of offshore wind and a large amount of potential source in deeper water region. Due to more powerful and high quality offshore wind resources than those on lands and less environmental issues associated with noise and view, floating offshore wind farm will be more popular and dominant solutions for utilizing wind energy(Hong et al., 2012). There is three types of floating structures being considered for floating wind tower substructures; a spar type structure, TLP type and semisubmersible platforms(Justin Wilkes et al., 2012). Blue H which has 80 kW floating wind turbine installed at 113 km off the coast of Italy was the first pilot utilizing tension-leg platform design. The first large-capacity, 2.3 megawatt floating wind turbine is Hywind spar, which was installed in the North Sea off of Norway. In October 2011, Principle Power" s WindFloat Prototype was installed 4km offshore of Aguçadoura, Portugal fitted with a 2.0MW offshore wind turbine is the first offshore wind turbine installed in open Atlantic waters and make use of a semi-submersible type floating foundation. Those three concepts have long been adopted for deepwater oil production platform successfully due to their excellent global performance in waves.

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