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The Effect of Flexibility for the Offshore Wind Turbine System  

Choi, Changho (Korea Institute of Construction technology Geotechnical engineering Research Division)
Han, Jintae (Korea Institute of Construction technology Geotechnical engineering Research Division)
Cho, Samdeok (Korea Institute of Construction technology Geotechnical engineering Research Division)
Jang, Youngeun (University of Science & Technology Department of Geospace engineering)
Publication Information
Journal of the Korean GEO-environmental Society / v.14, no.4, 2013 , pp. 59-66 More about this Journal
Abstract
The foundation of offshore wind energy system is generally assumed to be fixed-ended in system analysis for the convenience of calculation and, correspondingly, it might lead a conservative design. If soil-foundation interaction get involved with the analysis, the system characteristics such as natural frequency, shear force, moment and displacement are expected to differ from those of fixed-ended case. In this study, the analysis have been conducted to identify how the response of offshore wind turbine varies upon considering the foundation flexibility with soil-foundation interaction. The model taking account of the flexibility of foundation was compared with fixed-ended model at the seabed. The flexibilities of foundation were obtained by coupled spring model at the seabed and Winkler Spring Model with soil depth. As a result, the first mode of the whole system with the Winkler Spring Model was decreased relative to that with the fixed-ended model. The results showed that the effect of foundation flexibility should be considered when designing the offshore wind energy system.
Keywords
Offshore wind turbine foundation; Soil-foundation interaction; Coupled Spring Model; Winkler Spring Model;
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