半电极含金属芯压电纤维阵列研究

Research on Half Coated Metal Core Piezoelectric Fiber Array

通过计算半周期内的有效电压,分析了半电极含金属芯压电纤维阵列能量收集的动力学方程组,推导了纤维完全一致和存在尺寸差异两种情况下阵列收集的电压和能量方程,仿真计算了纤维几何参数满足正态分布时能量收集效率与半径比、纤维长度和半电极角度的方差之间的变化规律。分析结果表明,纤维尺寸差异越大,能量收集效率越低。为提高阵列在不同方向的外界激励下能量收集效率,需要在每根纤维直接连接交流-直流转换电路。

The electromechanical coupling dynamics of half coated metal core piezoelectric fiber array is analyzed by calculating the effective voltage in half cycle. The expression of harvest voltage and power is derived in two cases of uniformed fibers and different fibers. When the geometry parameters of the fibers meet normal distribute, the normalized harvesting power affected by the variance of radius ratio, length of fiber and angle of half electrode is simulated. The results show that the normalized harvesting power is lower with bigger difference of the fiber geome- try parameters. To improve the normalized harvesting power with different direction of environment vibration every fiber needs an AC-DC transfer circuit.