Institute for Electronic Appliances and Circuits, Faculty of Computer Science and Electrical Engineering, University of Rostock, Albert-Einstein-Str. 2, 18059 Rostock, Germany.
Sensors (Basel). 2019 Mar 7;19(5):1149. doi: 10.3390/s19051149.
In this paper, we present a novel vibration-based piezoelectric energy harvester, capable of collecting power at multiple operating frequencies and autonomously adapting itself to the dominant ambient frequencies. It consists of a compact dual-frequency resonator designed such that the first two fundamental natural frequencies are in the range of [50, 100] Hz, which is a typical frequency range for ambient vibrations in industrial environments. A magnetic frequency-tuning scheme is incorporated into the structure, which enables the frequency agility of the system. In contrast to single frequency harvesters, the presented approach combines multi-resonance and frequency tunability of both modes enabling a larger operative bandwidth. We experimentally demonstrate independent bi-directional tunability of our dual-frequency design. Furthermore, a control algorithm based on maximum amplitude tracking has been implemented for self-adaption of the system. The latter has been demonstrated in a system-level simulation model, which integrates the dual-frequency resonator, the magnetic tuning, and the control algorithm.
本文提出了一种新颖的基于振动的压电能量收集器，能够在多个工作频率下收集能量，并自动适应环境中的主导频率。它由一个紧凑的双频谐振器组成，设计使得前两个基频在[50,100]Hz 的范围内，这是工业环境中环境振动的典型频率范围。结构中采用了磁频率调谐方案，实现了系统的频率灵活性。与单频收集器相比，所提出的方法结合了多共振和两种模式的频率可调性，从而实现了更大的工作带宽。我们通过实验证明了我们的双频设计的独立双向可调性。此外，还实现了基于最大幅值跟踪的控制算法，用于系统的自适应。后者已在集成双频谐振器、磁调谐和控制算法的系统级仿真模型中得到了验证。
