Next Article in Journal
Scour Effects on the Lateral Behavior of a Large-Diameter Monopile in Soft Clay: Role of Stress History
Next Article in Special Issue
Motion Control of Pentapod Offshore Wind Turbines under Earthquakes by Tuned Mass Damper
Previous Article in Journal
Large-Scale Electric Propulsion Systems in Ships Using an Active Front-End Rectifier
Open AccessArticle

Analysis of Dynamic Characteristics of an Ultra-Large Semi-Submersible Floating Wind Turbine

by Zhixin Zhao 1,2, Xin Li 1,2,*, Wenhua Wang 1,2 and Wei Shi 1,3
1
State Key Laboratory of Coastal and Offshore Engineering, Dalian university of Technology, Dalian 116024, Liaoning, China
2
Institute of Earthquake Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
3
Deepwater Engineering Research Center, Offshore Renewable Energy Research Center, Dalian University of Technology, Dalian 116024, Liaoning, China
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(6), 169; https://doi.org/10.3390/jmse7060169
Received: 10 April 2019 / Revised: 7 May 2019 / Accepted: 28 May 2019 / Published: 1 June 2019
An initial design of the platform for the moderate water depth (100 m) is performed by upscaling of an existing 5 MW braceless semi-submersible platform design to support the DTU (Danish University of Science and Technology) 10 MW wind turbine. To investigate the dynamic characteristics of the ultra-large semi-submersible floating offshore wind turbine (FOWT), an aero-hydro-servo-elastic numerical modeling is applied to carry out the fully coupled time-domain simulation analysis. The motion responses of the ultra-large semi-submersible FOWT are presented and discussed for selected environmental conditions. Based on the quasi-static and dynamic analysis methods, the influence of the dynamic effects of the mooring lines on the platform motion responses and mooring line tension responses are discussed. Subsequently, the difference in the motion responses and structural dynamics of the DTU 10 MW and NREL (National Renewable Energy Laboratory) 5 MW FOWT is studied due to the difference in turbine properties. The simulation results reveal that the excitation of the low-frequency wind loads on the surge and pitch motions, the tower-base fore-aft bending moments and the mooring line tension response becomes more prominent when the size of the wind turbine increases, but the excitation action of the 3P effect on the structural dynamics of the 5 MW FOWT is more obvious than those of the 10 MW FOWT. View Full-Text
Keywords: semi-submersible floating offshore wind turbine; fully coupled numerical model; dynamic characteristic; power spectra; dynamic effects of mooring lines semi-submersible floating offshore wind turbine; fully coupled numerical model; dynamic characteristic; power spectra; dynamic effects of mooring lines
Show Figures

Figure 1

MDPI and ACS Style

Zhao, Z.; Li, X.; Wang, W.; Shi, W. Analysis of Dynamic Characteristics of an Ultra-Large Semi-Submersible Floating Wind Turbine. J. Mar. Sci. Eng. 2019, 7, 169.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop