Dynamic Responses of Jacket-Type Offshore Wind Turbines Using Decoupled and Coupled Models

[+] Author and Article Information
Muk Chen Ong

Professor Dept. of Mechanical and Structural Engineering and Materials Science, University of Stavanger (UiS), Stavanger, Norway

Erin E. Bachynski

Associate Professor Dept. of Marine Technology, Norwegian University of Science and Technology (NTNU), Trondheim, Norway

Ole David Økland

Senior Research Scientist Norwegian Marine Technology Research Institute (MARINTEK) Trondheim, Norway

1Corresponding author.

ASME doi:10.1115/1.4035772 History: Received September 09, 2016; Revised January 07, 2017


This paper presents numerical studies of the dynamic responses of two jacket-type offshore wind turbines 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. in 2012. 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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