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建立了压电纤维复合材料桨叶的非线性动力学模型。在此基础上,研究了压电纤维铺层对复合材料桨叶固有频率和桨叶扭转运动阻尼特性的影响。计算结果表明:桨叶扭转角变化量随着压电纤维施加电压的增加而增大;当电压为1000 V时,桨尖扭转角变化量大约为2°。压电纤维铺层对桨叶固有频率几乎没有影响,其存在不会改变原设计复合材料桨叶的频率分布。当压电纤维铺设方向与桨叶展向成45°时,其对桨叶扭转方向的阻尼特性有着很大的影响;采用适当的电压控制,可以明显增加扭转方向的阻尼。
A nonlinear dynamic model of piezoelectric fiber composite blade was established. Based on this, the influence of piezoelectric fiber ply on the natural frequency of blade and the damping characteristic of blade torsional motion was studied. The calculation results show that the change of blade twist angle increases with the increase of the applied voltage of piezoelectric fiber. When the voltage is 1000 V, the variation of tip twist angle is about 2 °. Piezoelectric fiber ply has almost no effect on the natural frequency of the blade, and its presence does not change the frequency distribution of the original composite blade. When the direction of piezoelectric fiber laying is 45 ° to the blade, it has a great influence on the damping characteristics of the blade in the twisting direction. Appropriate voltage control can obviously increase the torsional damping.