Analysis of Dynamic Response Characteristics in Time-Frequency Domain of Wind Turbine on Earthquake Loading

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (18) : 245-251.

YANG Yang1, LI Chun1, 2, YUAN Quanyong1, ZHANG Wanfu1,2

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Abstract

To analyze the seismic load impact on the structure dynamic response of large-scale wind turbine, modelling the wind turbine platform and soil interaction based on Wolf theory. Structure dynamic response of the NREL 5MW wind turbine on start-up, normal operating, yawing motion and emergency shutdown conditions are predicted through FAST tool. Due to the nonlinear and non–stationary characteristics of the time-domain aero-elastic response of wind turbine on seismic and turbulence inflow condition, the Hilbert-Huang Transform (HHT) method is applied to obtain the time-frequency characteristics for analyzing the multi-load coupling mechanism. The results show that the influence on tower-top deflection of seismic loading should be taken to consider, especially on side to side direction. Earthquake load is the main excitation load for tower-top vibration which is far above the effect of aerodynamics. The characteristic vibrational frequency of tower is the first order natural frequency. Seismic loading enhances the magnitude of first order natural frequency and second harmonic frequency obviously. The phenomenon should be considered in tower structural design.

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wind turbine / dynamic response / earthquake loading / Hilbert-Huang Transform

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YANG Yang1, LI Chun1, 2, YUAN Quanyong1, ZHANG Wanfu1,2. Analysis of Dynamic Response Characteristics in Time-Frequency Domain of Wind Turbine on Earthquake Loading[J]. Journal of Vibration and Shock, 2017, 36(18): 245-251

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