Analysis of Structural Dynamic Response of Wind Turbine in Time–Frequency Domain under Non-Stationary Operating Condition Based on HHT Method

YANG Yang1, LI Chun1, 2,YE Kehua1, MIAO Weipao1, YANG Jun1,2, GAO Wei3

Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (21) : 22-28.

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PDF(2133 KB)
Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (21) : 22-28.

Analysis of Structural Dynamic Response of Wind Turbine in Time–Frequency Domain under Non-Stationary Operating Condition Based on HHT Method

  • YANG Yang1, LI Chun1, 2,YE Kehua1, MIAO Weipao1, YANG Jun1,2, GAO Wei3
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Abstract

The typical non-stationary operating condition such as turbulent inflow of wind speed changing dramatically, starting up, yawing motion, and emergency shutdown would enhance the nonlinear aero-elastic response of wind turbine, the structural dynamic responses in time domain and frequency domain both have obvious non-stationary characteristics. The turbulent inflow of velocity and direction both varying intensely is created based on spectral model and coherent structure, the dynamic characteristics under non-stationary conditions are carried out through the aerodynamic-servo-elastic tool called FAST. The numerical calculation is compared with GH Bladed to verify the validity. The dynamic characteristics in time-frequency domain for blade and tower deflections are calculated based on Hilbert-Huang Transform (HHT) method. The results show that the deflections of tower and blade tip fluctuate within a narrow range about 40s and increase rapidly in starting up condition but fluctuate wildly about 20s and return to steady after emergency shutdown. Yawing motion lead to a clearly rise of tower tip deflection in side to side direction. The fluctuation of tower tip deflection at the first order vibration frequency is obvious and increase in yawing motion. The fluctuation blade tip deflection in plane is mainly caused by the rotor rotating and the unforced fluctuation at first order vibration in plane frequency is impacted by coherent structure. The negative aerodynamic damping for the particular mode shape develop the divergent oscillations, enlarging the structural damping should be considered in the initial design of blade to depress amplitude increasing caused by the dramatically decreasing of aerodynamic damping.
 

Key words

wind turbine / turbulent inflow / structural dynamic characteristics / HHT method

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YANG Yang1, LI Chun1, 2,YE Kehua1, MIAO Weipao1, YANG Jun1,2, GAO Wei3. Analysis of Structural Dynamic Response of Wind Turbine in Time–Frequency Domain under Non-Stationary Operating Condition Based on HHT Method[J]. Journal of Vibration and Shock, 2016, 35(21): 22-28

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