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Repowering Steel Tubular Wind Turbine Towers Enhancing them by Internal Stiffening Rings

1
School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2
School of Civil Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
*
Author to whom correspondence should be addressed.
Energies 2020, 13(7), 1538; https://doi.org/10.3390/en13071538
Received: 26 February 2020 / Revised: 20 March 2020 / Accepted: 22 March 2020 / Published: 25 March 2020
This paper presents a robust repowering approach to the structural response of tubular steel wind turbine towers enhanced by internal stiffening rings. First, a structural response simulation model was validated by comparison with the existing experimental data. This was then followed with a mesh density sensitivity analysis to obtain the optimum element size. When the outdated wind turbine system needs to be upgraded, the wall thickness, the mid-section width-to-thickness ratio and the spacing of the stiffening rings of wind turbine tower were considered as the critical design variables for repowering. The efficiency repowering range of these design variables of wind turbine towers of various heights between 50 and 250 m can be provided through the numerical analysis. Finally, the results of efficiency repowering range of design variables can be used to propose a new optimum design of the wind turbine system when repowering a wind farm. View Full-Text
Keywords: wind turbine tower; shell structure; finite element analysis; stiffening ring; sensitivity analysis; repowering wind turbine tower; shell structure; finite element analysis; stiffening ring; sensitivity analysis; repowering
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MDPI and ACS Style

Hu, Y.; Yang, J.; Baniotopoulos, C. Repowering Steel Tubular Wind Turbine Towers Enhancing them by Internal Stiffening Rings. Energies 2020, 13, 1538.

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