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Smart Structures and Systems Volume 23, Number 5, May 2019 , pages 405-420 DOI: https://doi.org/10.12989/sss.2019.23.5.405 |
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Vibration characteristics of offshore wind turbine tower with gravity-based foundation under wave excitation |
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Cong-Uy Nguyen, So-Young Lee, Thanh-Canh Huynh, Heon-Tae Kim and Jeong-Tae Kim
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| Abstract | ||
| In this study, vibration characteristics of offshore wind turbine tower (WTT) with gravity-based foundation (GBF) are identified from dynamic responses under wave-induced excitations. The following approaches are implemented to achieve the objective. Firstly, the operational modal analysis methods such as frequency domain decomposition (FDD) and stochastic subspace identification (SSI) are selected to estimate modal parameters from output-only dynamic responses. Secondly, a GBF WTT model composed of superstructure, substructure and foundation is simulated as a case study by using a structural analysis program, MIDAS FEA. Thirdly, wave pressures acting on the WTT structure are established by nonlinear regular waves which are simulated from a computational fluid software, Flow 3D. Wave-induced acceleration responses of the target structure are analyzed by applying the simulated wave pressures to the GBF WTT model. Finally, modal parameters such as natural frequencies and mode shapes are estimated from the output-only acceleration responses and compared with the results from free vibration analysis. The effect of wave height and period on modal parameter extraction is also investigated for the mode identification of the GBF WTT. | ||
| Key Words | ||
| wind turbine tower; caisson foundation; vibration characteristics; wave excitation | ||
| Address | ||
| Cong-Uy Nguyen, So-Young Lee, Thanh-Canh Huynh, Heon-Tae Kim and Jeong-Tae Kim: Department of Ocean Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea | ||