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Appl. Sci. 2017, 7(6), 509; doi:10.3390/app7060509

Passive Vibration Control of a Semi-Submersible Floating Offshore Wind Turbine

1
Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, China
2
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
*
Author to whom correspondence should be addressed.
Academic Editor: Antonio Ficarella
Received: 20 March 2017 / Revised: 8 May 2017 / Accepted: 9 May 2017 / Published: 26 May 2017
View Full-Text   |   Download PDF [4199 KB, uploaded 26 May 2017]   |  

Abstract

Floating offshore wind turbines have the potential to commercially convert the vast wind resource in deep-water area. Compared with fixed-bottom wind turbines, motions of the floating foundation complicate vibrations and loads of the wind turbine in offshore environment. To alleviate the responses of the wind turbine, this study investigates the use of fore–aft tuned mass damper (TMD) in nacelle/tower for passive control of a semi-submersible offshore wind turbine. A simplified structural model, considering the degree-of-freedom of platform pitch and surge, tower tilt and TMD translation, is proposed in the light of motion features of semi-submersible platform. After identifying ten unknown parameters, the correctness of the deterministic model is validated by pitch free decay responses. The mass, stiffness and damping of TMD are optimized using both method of exhaustion and genetic algorithm to avoid local minimum. Six optimized TMD devices are evaluated under three kinds of realistic environment conditions. The control effectiveness is assessed by the extreme and fatigue response reduction ratios. It is found that the high stiffness TMDs that directly dissipate the energy of tower oscillation exhibit an overall stable performance. Similar to the spar-type foundation, the TMDs in the nacelle/tower are capable of extending the service life of floating wind turbines. View Full-Text
Keywords: tuned mass damper; semi-submersible; floating offshore wind turbine; passive vibration control tuned mass damper; semi-submersible; floating offshore wind turbine; passive vibration control
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, C.; Zhuang, T.; Zhou, S.; Xiao, Y.; Hu, G. Passive Vibration Control of a Semi-Submersible Floating Offshore Wind Turbine. Appl. Sci. 2017, 7, 509.

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