A study on dynamic characteristics of wind turbines under complex conditions based on the modal superposition method

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (16) : 185-189.

CAO Li SUN Wenlei ZHOU Jianxing

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Abstract

Since the running environment of wind turbines is variable, wind-generating sets are subject to frequent disturbances and dynamic load excitations, resulting in strong vibrations, which are detrimental to the turbines’ operating performance and service life.Therefore, it is necessary to analyze their dynamic characteristics in various conditions.We did so by building computer models and adopting a computational method to calculate wind turbines’ dynamic characteristics in conditions of start-up, normal stop, turbulence, gusts, etc.We then applied the dynamic characteristics under various conditions.The results show that the wind turbine produced a huge transverse vibration under a transient forcing-flurry.The blade tip’s max displacement response is intensified up to 359.78% under a transient forcing-flurry, which was compared with the mean amplitude under the steady state.The max Von Mises stress at the top of tower is increased by 357.63% in reverse under a transient forcing-flurry, which was compared with the mean stress under the steady state, which should be given great attention in design.The results provide a useful theoretical basis for more optimal design of wind turbines.

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wind turbine / dynamic characteristics / modal superposition / gust / complex conditions

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CAO Li SUN Wenlei ZHOU Jianxing. A study on dynamic characteristics of wind turbines under complex conditions based on the modal superposition method[J]. Journal of Vibration and Shock, 2018, 37(16): 185-189

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