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Abstract
This paper presents a novel piezoelectric vibration energy harvester (PVEH) in which a high-frequency generating beam (HFGB) is driven by an array of low-frequency driving beams (LFDBs) using ropes. Two mechanisms based on frequency upconversion and multimodal harvesting work together to broaden the frequency bandwidth of the proposed vibration energy harvester (VEH). The experimental results show that the output power of generating beam (GB) remains unchanged with the increasing number of driving beams (DBs), compared with the traditional arrays of beams vibration energy harvester (AB-VEH), and the output power and bandwidth behavior can be adjusted by parameters such as acceleration, rope margin, and stiffness of LFDBs, which shows the potential to achieve unlimited wideband vibration energy-harvesting for a variable environment.
Highlights
Energy harvesting from ambient vibration—such as industrial machines, human activity, vehicles, structures, and environment sources—offers a clean, regenerative means for powering small-scale systems [1,2]
We propose a novel wideband piezoelectric vibration energy harvester (PVEH), in which a high-frequency generating beam (HFGB) is driven by an array of low-frequency driving beams (LFDBs) using ropes
According to our experimental results, for multiple LFDBs driving an HFGB together at a fixed acceleration, better performance operating bandwidth with continuous output) can be together at a fixedaacceleration, a better(wider performance can be realized by adjusting parameters such as rope margin and stiffness of LFDBs
Summary
Energy harvesting from ambient vibration—such as industrial machines, human activity, vehicles, structures, and environment sources—offers a clean, regenerative means for powering small-scale systems [1,2]. Typical piezoelectric vibration energy harvesters (VEHs) are composed of a mass-spring-damper system with a transducer based on linear mechanical principles [4] Such devices give an appreciable response amplitude only if the dominant ambient vibration frequency is close to the resonant frequency of the harvester [5], and the output drops dramatically when ambient vibration frequency is slightly different from the resonant frequency. It is impractical for the VEH, which is designed based on one resonant frequency mode with narrow bandwidth, to harvest energy from a variable environment. This wideband operation of the device offers a promising approach to work effectively in very complicated environments
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