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Multi-frequency array of nonlinear piezoelectric converters for vibration energy harvesting

机译:用于振动能量收获的非线性压电转换器的多频阵列

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Energy harvesting from wideband and random vibrations demands for techniques and solutions to overcome limitations of linear converters, which best operate when the frequency of vibrations matches the resonant frequency of the converter. Viable approaches comprise, among others, the use of array of linear harvesters with different resonant frequencies, the adoption of nonlinear techniques or the exploitation of mechanically coupled converters. This work proposes a piezoelectric energy harvester where the combination of such techniques is explored in a unique device. The harvester is composed of an array of four piezoelectric cantilevers fabricated by screen printing lead zirconate titanate (PZT) films on a stainless steel substrate. Nonlinear behavior of the cantilevers is achieved by exploiting the interaction between a magnet and their ferromagnetic steel substrate. Two configurations have been analyzed where the magnet is either fixed on the harvester base, or it is elastically suspended through a spring on the harvester base. The latter configuration introduces a mechanical coupling among the cantilevers. For the experimental characterization, the prototype has been excited by band-pass filtered white-noise mechanical vibrations in the range 10-100 Hz with amplitude in the range 0.1-2.2g. The obtained experimental results show that the rms values of the open-circuit output voltage for each cantilever increase in the nonlinear configuration and it can be up to 215% higher for the case with the elastically suspended magnet compared to the case of the same array operated in linear regime.
机译:从宽带和随机振动的能量收集需要技术和解决方案,以克服线性转换器的限制,这在振动频率与转换器的谐振频率匹配时最能运行。可行方法包括使用具有不同谐振频率的线性收割机阵列,采用非线性技术或机械耦合转换器的开发。这项工作提出了一种压电能量收割机,其中在独特的装置中探讨了这种技术的组合。收割机由一系列由丝网印刷引线锆钛酸盐(PZT)薄膜制成的四个压电悬臂器阵列组成。通过利用磁铁和其铁磁钢基材之间的相互作用来实现悬臂的非线性行为。已经分析了两种配置,其中磁铁固定在收割机基座上,或者它在收割机基部上的弹簧弹性悬挂。后一种配置引入了悬臂中的机械耦合。对于实验表征,原型通过带通滤波的白噪声机械振动在10-100Hz的范围内被激发,其幅度范围为0.1-2.2g。所获得的实验结果表明,对于每个悬臂的开路输出电压的RMS值在非线性配置中增加,并且由于弹性悬浮的磁体与操作的情况相比,由于弹性悬挂磁铁的情况可以高达215%在线性制度。

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