FREE VIBRATION CHARACTERISTICS ANALYSIS OF WIND TURBINE BLADE
Ma Jing-min1, Ren Yong-sheng2
1College of Mining and Safety Engineering , Shandong University of Science and Technology, 266510, China
2College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, 266510, China
Based on the displacements function including the warping caused by tensile, bending and torsion, By extended lagrange equation, vibration differential equations of composite wind turbine airfoil section blades are founded and solved by the Galerkin method. The three kinds of airfoil free vibration characteristics are compared. The influences of composite ply angle, taper ratio and rotating speed on the free vibration frequencies of blade are investigated. The natural frequencies of the blades are also got by comprehensive application of large-scale general finite element software ANSYS, Pro/E and Hypermesh. And the results are compared with Galerkin mechode's results in order to verify the correctness of this theory.
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