Different from the fixed-based wind turbines, the floating type wind turbines are regarded as under a free–free end operating condition. The tower structure of a floating offshore wind turbine is an integrated part connecting the nacelle and support platform. An analytic solution is presented in this technical brief for the free-vibration of the tower structure of a spar-type offshore wind turbine. The tower structure is modeled as a free–free beam based on Euler–Bernoulli beam-column theory. The platform and the nacelle are considered as two large mass components connected by torsion springs at two tower ends with different stiffness. The effects of system parameters on the natural frequencies are investigated under a range of variables, including the tower structure parameters, platform and nacelle parameters, and the connection types. Nonlinear relationships between those variables and the natural frequency of the tower structure are numerically found and some design issues are discussed for the spar-type floating wind turbines.
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December 2018
Technical Briefs
Natural Frequency Analysis of a Spar-Type Offshore Wind Turbine Tower With End Mass Components
Kan Ye,
Kan Ye
School of Mechanical and Mechatronic Engineering,
FEIT University of Technology Sydney,
P.O. Box 123,
Broadway, NSW 2007, Australia
e-mail: kan.ye@uts.edu.au
FEIT University of Technology Sydney,
P.O. Box 123,
Broadway, NSW 2007, Australia
e-mail: kan.ye@uts.edu.au
Search for other works by this author on:
Jinchen Ji
Jinchen Ji
School of Mechanical and Mechatronic Engineering,
FEIT University of Technology Sydney,
P.O. Box 123,
Broadway, NSW 2007, Australia
e-mail: jin.ji@uts.edu.au
FEIT University of Technology Sydney,
P.O. Box 123,
Broadway, NSW 2007, Australia
e-mail: jin.ji@uts.edu.au
Search for other works by this author on:
Kan Ye
School of Mechanical and Mechatronic Engineering,
FEIT University of Technology Sydney,
P.O. Box 123,
Broadway, NSW 2007, Australia
e-mail: kan.ye@uts.edu.au
FEIT University of Technology Sydney,
P.O. Box 123,
Broadway, NSW 2007, Australia
e-mail: kan.ye@uts.edu.au
Jinchen Ji
School of Mechanical and Mechatronic Engineering,
FEIT University of Technology Sydney,
P.O. Box 123,
Broadway, NSW 2007, Australia
e-mail: jin.ji@uts.edu.au
FEIT University of Technology Sydney,
P.O. Box 123,
Broadway, NSW 2007, Australia
e-mail: jin.ji@uts.edu.au
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received December 18, 2017; final manuscript received May 2, 2018; published online June 28, 2018. Assoc. Editor: Madjid Karimirad.
1Corresponding author.
J. Offshore Mech. Arct. Eng. Dec 2018, 140(6): 064501 (5 pages)
Published Online: June 28, 2018
Article history
Received:
December 18, 2017
Revised:
May 2, 2018
Citation
Ye, K., and Ji, J. (June 28, 2018). "Natural Frequency Analysis of a Spar-Type Offshore Wind Turbine Tower With End Mass Components." ASME. J. Offshore Mech. Arct. Eng. December 2018; 140(6): 064501. https://doi.org/10.1115/1.4040240
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