MW级风机叶片单点疲劳加载系统设计、建模及试验

DESIGN,MODELING AND TEST OF MW WIND TURBINE BLADE SINGLE-POINT FATIGUE LOADING SYSTEM

设计一套偏心质量块驱动的风机叶片单点疲劳加载系统。以叶片的最大挥舞方向振动为例,将系统简化为两自由度模型、建立动力学方程。采用异频驱动模式进行仿真试验,得出叶片加载点振幅最终会趋向稳定状态的结论。根据能量守恒定律,推导出偏心质量块回转驱动系统的能量守恒关系式,得出补给的能量与偏心质量块质量和臂长均成正比。最后构建一套areoblade1.5-40.3风机叶片疲劳加载系统,结果表明,在偏心质量块质量和臂长一定的条件下,叶片加载点振幅会逐渐趋于稳定;回转驱动频率越接近于叶片的固有频率,加载点振幅越大;当两者频率存在一定差异时,振幅最终会趋于稳定,但幅值会急剧减少。

A wind turbine driven. Take the maximum blade single-point fatigue loading system was designed based on an unbalanced shaft flapwise direction of wind turbine blade for example, the whole system was simplified as a two free degree model and the dynamic equation were built. When the unbalanced shaft was driven at the different frequency, simulation conclusion was that the wind turbine blade loading point amplitude tended to stability at last. According to the law of energy conservation, energy conservation equation of unbalanced shaft driven system was derivation and had concluded that energy supplied was proportional to the unbalanced shaft mass and its length. Finally, a single-point fatigue loading test system was set up for the areobladel. 5-40. 3 wind turbine blade. Test results proved that, under the condition of unbalanced shaft mass and its length, the blade loading point amplitude tended to be stable. The drive frequency was close to the blade resonance frequency, the bigger amplitude of wind turbine blade loading point. When there were certain differences between the two frequencies, the amplitude became stable at last, but reduced rapidly.