Study on Gyroscopic Effect of Floating Offshore Wind Turbines

Compared with bottom-fixed wind turbines, the supporting platform of a floating offshore wind turbine has a larger range of motion, so the gyroscopic effects of the system will be more obvious. In this paper, the mathematical analytic expression of the gyroscopic moment of a floating offshore wind t...

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Bibliographic Details
Published in:China ocean engineering 2021-04, Vol.35 (2), p.201-214
Main Authors: Chen, Jia-hao, Pei, Ai-guo, Chen, Peng, Hu, Zhi-qiang
Format: Article
Language:English
Subjects:
Angular velocity
Coastal Sciences
Direction
Engineering
Floating
Floating platforms
Fluid- and Aerodynamics
Gyroscopic moment
Inertia
Marine & Freshwater Sciences
Movement
Numerical analysis
Numerical and Computational Physics
Oceanography
Offshore
Offshore Engineering
Offshore operations
Pitch (inclination)
Rotation
Rotor speed
Simulation
Turbine engines
Turbines
Wind effects
Wind power
Wind turbines
Yaw
Yawing
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Summary:Compared with bottom-fixed wind turbines, the supporting platform of a floating offshore wind turbine has a larger range of motion, so the gyroscopic effects of the system will be more obvious. In this paper, the mathematical analytic expression of the gyroscopic moment of a floating offshore wind turbine is derived firstly. Then, FAST software is utilized to perform a numerical analysis on the model of a spar-type horizontal axis floating offshore wind turbine, OC3-Hywind, so as to verify the correctness of the theoretical analytical formula and take an investigation on the characteristics of gyroscopic effect. It is found that the gyroscopic moment of the horizontal axis floating offshore wind turbine is essentially caused by the vector change of the rotating rotor, which may be due to the pitch or yaw motion of the floating platform or the yawing motion of the nacelle. When the rotor is rotating, the pitch motion of the platform mainly excites the gyroscopic moment in the rotor’s yaw direction, and the yaw motion of the platform largely excites the rotor’s gyroscopic moment in pitch direction, accordingly. The results show that the gyroscopic moment of the FOWT is roughly linearly related to the rotor’s inertia, the rotor speed, and the angular velocity of the platform motion.
ISSN:0890-5487
2191-8945
DOI:10.1007/s13344-021-0018-z