Publication: Mechanistic model for dynamic soil-structure interaction and natural frequency assessment of monopile offshore wind turbine structures
Issued Date
2020-01-01
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2-s2.0-85089196806
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Mahidol University
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SCOPUS
Bibliographic Citation
Proceedings of the 29th European Safety and Reliability Conference, ESREL 2019. (2020), 2121-2126
Suggested Citation
Yasothorn Sapsathiarn, Thanyawut Wansuwan Mechanistic model for dynamic soil-structure interaction and natural frequency assessment of monopile offshore wind turbine structures. Proceedings of the 29th European Safety and Reliability Conference, ESREL 2019. (2020), 2121-2126. doi:10.3850/978-981-11-2724-3_0691-cd Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/57891
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Title
Mechanistic model for dynamic soil-structure interaction and natural frequency assessment of monopile offshore wind turbine structures
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Abstract
© 2019 European Safety and Reliability Association. Published by Research Publishing, Singapore. Offshore wind turbines have a potential to be alternative sustainable sources of energy. The structures of offshore wind turbine are dynamically sensitive and must be designed so that the natural frequency of the structures is kept away from the frequencies of the excitation to avoid the dynamic amplification and fatigue damage. This paper presents a mechanistic model for offshore wind turbines with monopile foundations, including the effects of soil-structure interaction to evaluate the natural frequencies of wind turbines. The dynamic model of wind turbine structure is based on the Euler-Bernoulli beam theory with varying stiffness and elastic-end support. The varying stiffness beam model can be used to consider offshore wind turbines with non-uniform cross-sections such as a wind turbine with tapered tubular tower. The interaction of the wind turbine structure with the foundation is represented by a set of springs, i.e., the lateral, rotational, and the cross coupling stiffness springs. The proposed model is used to evaluate the natural frequencies of offshore wind turbines with parameters reported in the literature. The influence of soil-structure interaction on the natural frequency of the wind turbine system is investigated.