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General Information
Editor-in-chief
Prof. T. Hikmet Karakoc
Anadolu University, Faculty of Aeronautics and Astronautics, Turkey

IJET 2017 Vol.10(1): 41-45 ISSN: 1793-8236
DOI: 10.7763/IJET.2018.V10.1032

Numerical Analysis of a Gravity Substructure for 5MW Offshore Wind Turbine

Min-Su Park, Youn-Ju Jeong, Young-Jun You, and Jeongsoo Kim
Abstract—The substructure for offshore wind turbine is strongly influenced by wave forces as the size of substructure increases. Since a large offshore wind turbine has a heavy dead load, the reaction forces on the substructure become severe. Therefore, the very firm foundation should be required and the soil-structure interaction should be considered. When the structure is large compared to the wave length, the diffraction of waves should be considered. In the present study ANSYS AQWA is used to evaluate the wave forces acting on the gravity substructure. The wave forces and panel pressure on the gravity substructure are presented for various wave conditions. Moreover, the foundation stiffness of gravity substructure is determined based on the DNV-OS-J101 formulae from elastic theory. Using the wave forces and foundation stiffness matrix obtained from this study, the structural analysis of the gravity substructure is carried out through ANSYS mechanical. The structural behaviors of the strength and deformation are evaluated to investigate an ultimate structural safety of gravity substructure for various wave conditions. Also, the modal analysis is carried out to investigate the resonance between the wind turbine and the gravity substructure. It is found that the suggested gravity substructure can be an effective substructure for reducing hydrodynamic effects and construction costs in jeju island sea of Korea.

Index Terms—Offshore wind energy, Gravity substructure, Modal analysis, Structural analysis, soil-structure interaction.

The authors are with the Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology, Goyang-Si, South Korea (e-mail: mspark@kict.re.kr, yjjeong@kict.re.kr, yjyou@kict.re.kr, jeongsookim@kict.re.kr).

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Cite: Min-Su Park, Youn-Ju Jeong, Young-Jun You, and Jeongsoo Kim, "Numerical Analysis of a Gravity Substructure for 5MW Offshore Wind Turbine," International Journal of Engineering and Technology vol. 10, no. 1, pp. 41-45, 2018.

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