本文以有限元素法探討壓電複合樑之振動抑制，針對複合樑前三模態的組合討論壓電致動器不同施加電壓的方式和分別以速度和位移當作初始值所造成的影響。壓電致動器對稱貼附在複合樑的相對的表面，施加反相的電壓於上、下側的壓電致動器以產生控制彎矩，根據複合樑的能量的變化來改變電壓的正負號。結果顯示，不管是以速度或者位移當作初始值，其在單一模態的振動都受到良好的抑制，多個模態組合為初始值，獨立抑制各個模態的效果會比同時抑制每個模態的效果優良，從較高模態先抑制的效果比較低模態先抑制有效。

The effect of piezoelectric actuator on vibration suppression of composite beam structure was investigated by Finite Element Method. The influence of the different voltage types apply to piezoelectric actuators, the initial condition of velocity and displacement on the combination of the first three modes of composite beam was studied. The piezoelectric actuators are symmetrically bonded on the opposite surface of the beam. In order to generate control moments, the out-of-phase voltages applied to piezoelectric actuators and change their signal according to the energy variation of composite beam. The results show that the vibration suppression of the single mode are notable for both of the velocity and displacement initial conditions. For the combination of various modes as the initial conditions, the effect of suppressing each mode independently is better than suppressing all modes simultaneously. Besides, the effect of suppressing the higher mode first is better than suppressing the lower mode first.

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