Magnetic Frequency Tuning of a Multimodal Vibration Energy Harvester

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 fun...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2019-03, Vol.19 (5), p.1149
Main Authors: Bouhedma, Sofiane, Zheng, Yuhang, Lange, Fred, Hohlfeld, Dennis
Format: Article
Language:English
Subjects:
bi-stability
energy harvesting
magnetic frequency tuning
multimodal structures
nonlinear resonators
piezoelectricity
vibration
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s19051149