| The primary problem of dynamic researching is the systematic resonance and stability for the wind turbine. The alternate load, air driving force inertial force and elastic force etc that be pressed on the blade of wind turbine, can bring on coupling vibration of the elastic blade and tower when the wind turbine works in the condition of natural wind. If the frequency of outside force approaches the systematic natural frequency, the resonance will be happened and arousing intense destroying for wind turbine. Therefore, only making the systematic natural frequency keep away from the frequency of outside force can avoid resonance.By looking up a lot of data, the coupled rotor brandishing and tower front and backbending system is analyzed. The azimuth angleφis considered. Firstly, tower and rotor areseparated. A motion equation is set up which could describe rotor hub and nacelle tower with mode analytical method. Then, the consistent condition of hub and tower is performed to establish the coupled rotor/tower motion equation. The methods that can reasonable predigest the blade and tower model is discovered.The 1MW wind turbine of Shenyang University of Technology SUT-1000 is analyzed with above model. The systematic natural frequency and response curve are obtained. The results indicate that the wind turbine work is steady and the systematic natural frequency is not coincided with the rotor frequency. The effect relation between each parts weight and tower structure on wind turbine natural frequency is caught.In order to prove the mathematical modal is correct, the wind turbine SUT-1000 is also analyzed and calculated with Bladed wind turbine special design software combined with ANSYS finite element analysis software. It is important to analyze the stability of coupled rotor/tower system in the course of wind turbine independent design by the above analysis. It has important theory value and actual significance for wind turbine in enhancing capability and optimal design.
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