This paper presents numerical studies of the dynamic responses of two jacket-type offshore wind turbines (OWTs) using both decoupled and coupled models. The investigated structures are the OC4 (Offshore Code Comparison Collaboration Continuation) jacket foundation and a full-lattice support structure presented by Long et al., 2012, “Lattice Towers for Bottom-Fixed Offshore Wind Turbines in the Ultimate Limit State: Variation of Some Geo metric Parameters,” ASME J. Offshore Mech. Arct. Eng., 134(2), p. 021202. Both structures support the NREL 5-MW wind turbine. Different operational wind and wave loadings at an offshore site with relatively high soil stiffness are investigated. In the decoupled (hydroelastic) model, the thrust and torque from an isolated rotor model were used as wind loads on the decoupled model together with a linear aerodynamic damper. The coupled model is a hydro-servo-aero-elastic representation of the system. The objective of this study is to evaluate the applicability of the computationally efficient linear decoupled model by comparing with the results obtained from the nonlinear coupled model. Good agreement was obtained in the eigen-frequency analysis, decay tests, and wave-only simulations. It was also found that, by applying the thrust force from an isolated rotor model in combination with linear damping, reasonable agreement could be obtained between the decoupled and coupled models in combined wind and wave simulations.
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August 2017
Research-Article
Dynamic Responses of Jacket-Type Offshore Wind Turbines Using Decoupled and Coupled Models
Muk Chen Ong,
Muk Chen Ong
Professor
Department of Mechanical and Structural,
Engineering and Materials Science,
University of Stavanger (UiS),
Stavanger 4036, Norway
e-mail: muk.c.ong@uis.no
Department of Mechanical and Structural,
Engineering and Materials Science,
University of Stavanger (UiS),
Stavanger 4036, Norway
e-mail: muk.c.ong@uis.no
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Erin E. Bachynski,
Erin E. Bachynski
Associate Professor
Department of Marine Technology,
Norwegian University of Science and
Technology (NTNU),
Trondheim 7491, Norway
e-mail: erin.bachynski@ntnu.no
Department of Marine Technology,
Norwegian University of Science and
Technology (NTNU),
Trondheim 7491, Norway
e-mail: erin.bachynski@ntnu.no
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Ole David Økland
Ole David Økland
Norwegian Marine Technology
Research Institute (MARINTEK),
Trondheim 7052, Norway
e-mail: Ole.Okland@marintek.sintef.no
Research Institute (MARINTEK),
Trondheim 7052, Norway
e-mail: Ole.Okland@marintek.sintef.no
Search for other works by this author on:
Muk Chen Ong
Professor
Department of Mechanical and Structural,
Engineering and Materials Science,
University of Stavanger (UiS),
Stavanger 4036, Norway
e-mail: muk.c.ong@uis.no
Department of Mechanical and Structural,
Engineering and Materials Science,
University of Stavanger (UiS),
Stavanger 4036, Norway
e-mail: muk.c.ong@uis.no
Erin E. Bachynski
Associate Professor
Department of Marine Technology,
Norwegian University of Science and
Technology (NTNU),
Trondheim 7491, Norway
e-mail: erin.bachynski@ntnu.no
Department of Marine Technology,
Norwegian University of Science and
Technology (NTNU),
Trondheim 7491, Norway
e-mail: erin.bachynski@ntnu.no
Ole David Økland
Norwegian Marine Technology
Research Institute (MARINTEK),
Trondheim 7052, Norway
e-mail: Ole.Okland@marintek.sintef.no
Research Institute (MARINTEK),
Trondheim 7052, Norway
e-mail: Ole.Okland@marintek.sintef.no
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received September 9, 2016; final manuscript received January 7, 2017; published online May 5, 2017. Assoc. Editor: Yi-Hsiang Yu.
J. Offshore Mech. Arct. Eng. Aug 2017, 139(4): 041901 (8 pages)
Published Online: May 5, 2017
Article history
Received:
September 9, 2016
Revised:
January 7, 2017
Citation
Chen Ong, M., Bachynski, E. E., and David Økland, O. (May 5, 2017). "Dynamic Responses of Jacket-Type Offshore Wind Turbines Using Decoupled and Coupled Models." ASME. J. Offshore Mech. Arct. Eng. August 2017; 139(4): 041901. https://doi.org/10.1115/1.4035772
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