Offshore wind turbines (OWTs) might be subjected to seismic loads with different peak accelerations during operation in the actively seismic regions. The earthquakes might be a potential risk for the OWTs due to its stochastic nature. Earthquake with wind and wave loads could act on OWT at the same time; thus, the structural responses of such OWTs should be analyzed taking into consideration the reasonable load combinations. Based on the hydro-elastic similarity, an integrated model of the combined National Renewable Energy Laboratory (NREL) 5 MW wind turbine and a practical pentapod substructure is designed for testing. The governing equations of motion of the integrated OWT are established. The dynamic tests and numerical analysis of the OWT model are performed under different combinations of seismic, wind, and sea load conditions. The El Centro and American Petroleum Institute (API)-based synthesized seismic waves with different peak ground accelerations (PGAs) are considered in this study. The numerical results are in good agreement with the experimental ones. The coupling effect of the OWT structure under the combined load conditions is demonstrated from the experimental and numerical results. The results indicate that the interaction of earthquake, wind, wave, and current should be taken into account in order to obtain proper structural response, especially with small PGA.
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June 2017
Research-Article
Model Test and Numerical Analysis of a Multi-Pile Offshore Wind Turbine Under Seismic, Wind, Wave, and Current Loads
Wenhua Wang,
Wenhua Wang
State Key Laboratory of Costal
and Offshore Engineering;
and Offshore Engineering;
Institute of Earthquake Engineering,
Faculty of Infrastructure Engineering,
Dalian University of Technology,
Dalian 116024, China
Faculty of Infrastructure Engineering,
Dalian University of Technology,
Dalian 116024, China
Search for other works by this author on:
Zhen Gao,
Zhen Gao
Centre for Autonomous Marine
Operations and Systems,
Department of Marine Technology,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
Operations and Systems,
Department of Marine Technology,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
Search for other works by this author on:
Xin Li,
Xin Li
State Key Laboratory of Costal
and Offshore Engineering;
and Offshore Engineering;
Institute of Earthquake Engineering,
Faculty of Infrastructure Engineering,
Dalian University of Technology,
Dalian 116024, China
Faculty of Infrastructure Engineering,
Dalian University of Technology,
Dalian 116024, China
Search for other works by this author on:
Torgeir Moan
Torgeir Moan
Centre for Autonomous Marine
Operations and Systems,
Department of Marine Technology,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
Operations and Systems,
Department of Marine Technology,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
Search for other works by this author on:
Wenhua Wang
State Key Laboratory of Costal
and Offshore Engineering;
and Offshore Engineering;
Institute of Earthquake Engineering,
Faculty of Infrastructure Engineering,
Dalian University of Technology,
Dalian 116024, China
Faculty of Infrastructure Engineering,
Dalian University of Technology,
Dalian 116024, China
Zhen Gao
Centre for Autonomous Marine
Operations and Systems,
Department of Marine Technology,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
Operations and Systems,
Department of Marine Technology,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
Xin Li
State Key Laboratory of Costal
and Offshore Engineering;
and Offshore Engineering;
Institute of Earthquake Engineering,
Faculty of Infrastructure Engineering,
Dalian University of Technology,
Dalian 116024, China
Faculty of Infrastructure Engineering,
Dalian University of Technology,
Dalian 116024, China
Torgeir Moan
Centre for Autonomous Marine
Operations and Systems,
Department of Marine Technology,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
Operations and Systems,
Department of Marine Technology,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received April 5, 2016; final manuscript received November 15, 2016; published online February 17, 2017. Assoc. Editor: Kazuhiro Iijima.
J. Offshore Mech. Arct. Eng. Jun 2017, 139(3): 031901 (17 pages)
Published Online: February 17, 2017
Article history
Received:
April 5, 2016
Revised:
November 15, 2016
Citation
Wang, W., Gao, Z., Li, X., and Moan, T. (February 17, 2017). "Model Test and Numerical Analysis of a Multi-Pile Offshore Wind Turbine Under Seismic, Wind, Wave, and Current Loads." ASME. J. Offshore Mech. Arct. Eng. June 2017; 139(3): 031901. https://doi.org/10.1115/1.4035305
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