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Lookup NU author(s): Professor Zhiqiang Hu
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Sage Publications Ltd, 2018.
For re-use rights please refer to the publisher's terms and conditions.
Compared to onshore wind turbines, aerodynamics-induced dynamic characteristics of a floating wind turbine are more complicated due to its coupled aero-hydro-servo-elastic behaviours. The study investigates these aerodynamics-induced dynamic characteristics using an OC4 semi-submersible floating wind turbine. In this research, a high-fidelity wind field and a 1/50th scale model were tested. The dynamic characteristics induced by the aerodynamic effects were investigated in detail via the experimental results, including aerodynamic damping effect, gyroscopic effect, dynamic responses of the Rotor-Nacelle-Assembly and dynamic responses of the mooring system. It was found that aerodynamic damping is active in reducing surge and pitch resonant responses and probably increases with the inflow wind speed and the rotating-blades induced induction coefficient; the gyroscopic effect intensifies the yaw motion and increases with therotate speed of a rotor; the significant responses from Rotor-Nacelle-Assembly may occur when the natural frequencies of the tower are close to some of the aerodynamic periodic frequencies; and the mooring system is more sensitive to the wave exciting forces than to the aerodynamic loads. This study presents the complexity of the dynamic characteristics induced by the aerodynamic effects in the floating wind turbine, and in the design code, using a time-domain analysis software, which considers the coupling between the wind- and wave-induced loads and responses are suggested.
Author(s): Chen J, Hu Z
Publication type: Article
Publication status: Published
Journal: Journal of Engineering for the Maritime Environment
Print publication date: 01/02/2018
Online publication date: 29/04/2017
Acceptance date: 23/03/2017
Date deposited: 30/03/2017
ISSN (print): 1475-0902
ISSN (electronic): 2041-3084
Publisher: Sage Publications Ltd
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