Torsional Stiffness Effects on the Dynamic Stability of a Horizontal Axis Wind Turbine Blade

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Aeroelastic instability problems have become an increasingly important issue due to the increased use of larger horizontal axis wind turbines. To maintain these large structures in a stable manner, the blade design process should include studies on the dynamic stability of the wind turbine blade. Therefore, fluid-structure interaction analyses of the large-scaled wind turbine blade were performed with a focus on dynamic stability in this study. A finite element method based on the large deflection beam theory is used for structural analysis considering the geometric nonlinearities. For the stability analysis, a proposed aerodynamic approach based on Greenberg's extension of Theodorsen's strip theory and blade element momentum method were employed in conjunction with a structural model. The present methods proved to be valid for estimations of the aerodynamic responses and blade behavior compared with numerical results obtained in the previous studies. Additionally, torsional stiffness effects on the dynamic stability of the wind turbine blade were investigated. It is demonstrated that the damping is considerably influenced by variations of the torsional stiffness. Also, in normal operating conditions, the destabilizing phenomena were observed to occur with low torsional stiffness.
Publisher
MDPI AG
Issue Date
2013-04
Language
English
Article Type
Article
Keywords

MW-SIZED BLADE; AEROELASTIC STABILITY; SPEED

Citation

ENERGIES, v.6, no.4, pp.2242 - 2261

ISSN
1996-1073
DOI
10.3390/en6042242
URI
http://hdl.handle.net/10203/174805
Appears in Collection
AE-Journal Papers(저널논문)
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