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The Scientific World Journal
Volume 2014, Article ID 840283, 10 pages
http://dx.doi.org/10.1155/2014/840283
Research Article

Mooring Line Damping Estimation for a Floating Wind Turbine

1Deepwater Engineering Research Center, Dalian University of Technology, Dalian 116024, China
2State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China

Received 28 May 2014; Revised 10 August 2014; Accepted 13 August 2014; Published 27 August 2014

Academic Editor: Pradeep Lancy Menezes

Copyright © 2014 Dongsheng Qiao and Jinping Ou. 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.

Abstract

The dynamic responses of mooring line serve important functions in the station keeping of a floating wind turbine (FWT). Mooring line damping significantly influences the global motions of a FWT. This study investigates the estimation of mooring line damping on the basis of the National Renewable Energy Laboratory 5 MW offshore wind turbine model that is mounted on the ITI Energy barge. A numerical estimation method is derived from the energy absorption of a mooring line resulting from FWT motion. The method is validated by performing a 1/80 scale model test. Different parameter changes are analyzed for mooring line damping induced by horizontal and vertical motions. These parameters include excitation amplitude, excitation period, and drag coefficient. Results suggest that mooring line damping must be carefully considered in the FWT design.