Large-scale Wind Turbine Dynamics Characteristics Research Based On Flexible Multi-body System And Bionic Mechanism Explore

The advantage of wind energy is significant to the improvement of energy structure. In recent years, the MW wind turbine has become the mainstream style. Large-scale horizontal axis wind turbine is a complex flexible multi-body system. The hierarchical system-coupling becomes significant and important in order to keep the dynamics system stable for wind turbine. As the direct catching wind sector, the flexibility of blade is growing as the size increasing, reasonable dynamic performance for wind turbine can enhance the anti-typhoon performance, expand the working wind speed under high reliability, and improve the output power.Based on the flexible multi-body dynamic system theory, analysis and research of blade and wind turbine whole structure machine have been done using the finite element modeling simulation and experimental means. And the result shows that: there is little influence to the nature frequency in the case of stress rigidity for the blade rotating; the angle of layers will greatly adjust the nature frequency of blades; unsteady wind excitation makes the blade structure vibration causing alternating stress which may be very harmful blades; tip mode displacement changes like sinusoid fluctuations with the azimuth; wind turbine rotation causes the global stiffness matrix and damping changing under gust excitation, resulting in blade and tower dynamic acceleration phase response more complex; the shaft rotor hub stiffness will have great influence to the wind wheel and tower dynamic response with gust excitation.Inspired by the similar working environment between a kind of offshore plants and wind turbine, an experiment combined with bionics methods for plant trunk geometry and material characters was done in order to explore the anti-wind mechanism. The result shows that trunk exist a geometric structural material grade classification characteristics. Static and dynamic finite element computation shows that: palm tree trunks have a good flexible characters compared to the tower, which can reduce the external loading caused by the cumulative fatigue damage and improving the environment adaptability. It will be a good bionic design method for the design of anti-typhoon and flexible wind turbine.