In the present study, a numerical and experimental study is conducted for a floating wind tower substructure of 5MW capacity. The design targets are cost effective, smaller draft than SPAR, simple to construct and install. The basic idea for shape design comes from the truss-spar which utilizes a large heaving plate for enhancing global performance. A 9-node HOBEM was applied for numerical parametric study because of its accuracy especially for sharp-edged shapes. A preliminary model test was conducted for verification of the numerical design. The numerical and model tests results were compared with same class spar type design.


Renewable energy resources have been gaining attention due to their environmental friendliness(zero CO2 emissions) and a large amount of potential source. Among various renewable energy resources such as sunlight, wind, tide/current and wave, wind energy has been commercially developed and utilized worldwide because of its better economics compared with others. There are now many thousands of wind turbines operating, with a total nominal capacity of 194.4 GW as of 2010. Many EU countries such as UK, Germany, Spain and Denmark have plans to provide more than 10% of required electric power by using wind power. Efforts to search high efficiency and high power wind turbine system have been leading offshore wind farm concepts. 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. There have been two typical types of floating structures being considered for floating wind tower substructures; a spar type structure and a TLP type one. Both concepts have long been adopted for deepwater oil production platform successfully due to their excellent global performance in waves.

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