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| Effect of rotation speed on mode of fan blades and its Weibull fitting |
| ZHANG Jianping1*, LIU Ming1, ZHANG Zhiwei2, WANG Mingqiang3, HAN Yi3 |
| 1. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; 2. Shanghai Dong Hai Wind Power Co., Ltd., Shanghai 200090, China; 3. College of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai 200090, China |
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Abstract To investigate the effect of rotation effect on the mode of wind turbine blades, the finite element model of the blades was established and imported into ANSYS software for calculation. The modes of the blades under static and rotating conditions were obtained, and the relationship between rotational speed and blade modal frequency was obtained by Weibull function fitting. The results show that the vibration mode of stationary blades basically keeps the mixed mode of swing and shimmy or one of the dominant modes with the increase of modal order, while the torsional mode does not appear until the tenth order mode. The vibration mode frequencies and modes of the rotating blade are significantly different from those of the stationary blade. The first and second order vibration modes exhibit the swing vibration in the opposite direction, while the vibration form of the third to tenth order are similar to that of the first to seventh order under the static conditions. The rotating blade have stronger resistance to bending and torsion. With the increase of rotation speed, the blade modal frequencies from the third to the seventh order show a non-linear decreasing trend, while those from the eighth to tenth order present an opposite trend. The Weibull function fitting model can not only describe the variation law of blade modal with rotation speed, but also has high fitting accuracy. The research results provide a theoretical basis and technical guidance for the safe operation and reliability design of wind turbines.
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Received: 12 August 2019
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