Bend-twist coupling potential of wind turbine blades

The Science of Making Torque from Wind 2014

Fedorov, V.^1 ; Berggreen, C.^2

Department of Wind Energy, Technical University of Denmark, Building 114, Frederiksborgvej 399, DK-4000 Roskilde, Denmark^1

Department of Mechanical Engineering, Technical University of Denmark, Building 403/026, Nils Koppels Alle, DK-2800 Kgs. Lyngby, Denmark^2

关键词: Bend-twist coupling;    Blade structures;    Composite beam;    Coupling coefficient;    Coupling effect;    Euler Bernoulli beams;    Torsional stiffness;    Wind turbine blades;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/524/1/012035/pdf
DOI  :  10.1088/1742-6596/524/1/012035

来源: IOP

【 摘 要 】

In the present study an evaluation of the potential for bend-twist coupling effects in wind turbine blades is addressed. A method for evaluation of the coupling magnitude based on the results of finite element modeling and full-field displacement measurements obtained by experiments is developed and tested on small-scale coupled composite beams. In the proposed method the coupling coefficient for a generic beam is introduced based on the Euler-Bernoulli beam formulation. By applying the developed method for analysis of a commercial wind turbine blade structure it is demonstrated that a bend-twist coupling magnitude of up to 0.2 is feasible to achieve in the baseline blade structure made of glass-fiber reinforced plastics. Further, by substituting the glass-fibers with carbon-fibers the coupling effect can be increased to 0.4. Additionally, the effect of introduction of bend-twist coupling into a blade on such important blade structural properties as bending and torsional stiffness is demonstrated.