Dynamic characteristics analysis of wind turbine drive train with flexible supporting

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (17) : 44-51.

Zhang Sheng-lin Zhu Cai-chao Song Chao- sheng Huang Hua-qing

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Abstract

In order to acquire the wind energy in the sky, most of the wind turbines are installed on the 100-meter towers. The flexibility of tower leads the force share and stress deformation of drive train become complex, while the wind turbines are always under varying direction of wind, loads and harsh working conditions, and this has become a weak link. A three point supporting wind turbine model in which the tower is considered to be flexible is analyzed, and the coupling parameters are extracted by finite elements method, then the dynamic coupling model of drive train with flexible support is established. The natural characteristic of the model is studied, the modes of the first two natural frequencies of the system respectively correspond to the tower swing and torsional vibration; after that, campbell diagram is used to get the potential resonance frequencies, modal-energy method is used on the identification of the potential resonance and the result indicates that 1.55Hz is the just potential frequency. An experiment is carried out in the wind field, in which the vibration characteristics of the main shaft are monitored when the rotational speed varies. The experimental result is consisting with the theoretical result, the error is one percent.

Key words

Wind turbine / Drive train / Dynamic behavior / Flexible supporting / Coupling analysis

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Zhang Sheng-lin Zhu Cai-chao Song Chao- sheng Huang Hua-qing. Dynamic characteristics analysis of wind turbine drive train with flexible supporting[J]. Journal of Vibration and Shock, 2016, 35(17): 44-51

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