Operational modal analysis of a large wind turbine

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (6) : 121-126.

ZHONG Can-tang1，LI De-yuan1，WANG Xian-neng1，MO Wen-wei1，LIU Xiong2

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Abstract

This paper aims to research the vibration modes and its variation characteristics of large wind turbine under static status and various rotational speeds. The variation of each mode caused by elastic deformation, inertia and gyroscopic effect and its effects on aeroelastic stability of wind turbine system were studied. Taking the large wind turbine system’s non-linear characteristic and time-varying characteristic caused by the rotational wind rotor into account, the linear eigenvalue problems of wind turbine were analyzed first via dynamics software ADAMS, based on dynamics theory of multi-body system and modeling methodology of Hybrid Multi-body system (HMBS). Next, stiff integral method was employed to numerically solve the non-linear control equations of system considering the elastic deformation of flexible components and the rotation of wind rotor. The operational modal identification was performed through Fourier spectral analysis method. The variation characteristics of the system’s first ten modes and their influencing factors were discussed and analyzed in detail. The research results can be used as aeroelastic stability criteria which offer effective solution and analysis method for avoiding resonance and improving operating efficiency of wind turbine system.

Key words

wind turbine / superelement / modal analysis / aeroelastic stability

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ZHONG Can-tang1，LI De-yuan1，WANG Xian-neng1，MO Wen-wei1，LIU Xiong2. Operational modal analysis of a large wind turbine[J]. Journal of Vibration and Shock, 2016, 35(6): 121-126

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