Geometric Nonlinear Dynamics Response Research of Large-scale Wind Turbine

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (14) : 182-187.

Cao Jiufa，Wang Tongguang ，Wang Xiao

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Abstract

With the development of the large-scale flexible wind turbine, the deflection of the blade gets larger, which making the geometric nonlinear effect more obvious. A free vortex wake model is presented to improve the accuracy of the aerodynamics load. The blade is assumed to be a beam model to analyze the structural response with the finite element method. Then the nonlinear kinetic equation is built, in which the geometric nonlinear stiffness matrix is calculated by the Galerkin method. The equation is solved with the Newmark immediate integration method and the corrected Newton-Raphson method for time marching. Thus, the coupling simulation between the aerodynamics performance and the geometric nonlinear structural response of the large-scale wind turbine blade is realized. The computed results for NREL Phase VI rotor compare well with the experimental data, validating the prediction accuracy of the calculation model. The linear and nonlinear dynamics response of the large-scale wind turbine NH1500 is then calculated. The result indicates the influence on the structural response and aerodynamics performance of the geometric nonlinear analysis. The model is helpful to improve the design standard of the large-scale wind turbine and the accuracy of the load calculation.

Key words

wind turbine / free vortex wake method / geometric nonlinear / Newton-Raphson method / dynamics response

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Cao Jiufa，Wang Tongguang,Wang Xiao. Geometric Nonlinear Dynamics Response Research of Large-scale Wind Turbine[J]. Journal of Vibration and Shock, 2016, 35(14): 182-187

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