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 elastical...

中文翻译：

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用于振动能量收集的非线性压电变换器的多频率阵列

从宽带和随机振动中收集能量需要克服线性转换器局限性的技术和解决方案，当振动频率与转换器的谐振频率匹配时，线性转换器才能最佳地工作。可行的方法包括：使用具有不同谐振频率的线性收割机阵列，采用非线性技术或开发机械耦合转换器。这项工作提出了一种压电能量收集器，其中在独特的装置中探索了这些技术的组合。收割机由四个压电悬臂阵列组成，这些悬臂是通过在不锈钢基板上丝网印刷钛酸锆钛酸铅（PZT）薄膜制成的。悬臂的非线性行为是通过利用磁体与其铁磁钢基底之间的相互作用来实现的。已经分析了两种配置，其中磁铁要么固定在收割机底座上，要么是弹性的。