Volume 130, Number 5, June 2020
|Number of page(s)||7|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||06 July 2020|
Experimental study of auto-tuning piezoelectric energy harvester attaching balls in boxes
1 College of Mechanical Engineering, Beijing University of Technology - Beijing 100124, China
2 Key Laboratory of Nonlinear Vibration and Strength of Mechanical Structures - Beijing 100124, China
Received: 26 February 2020
Accepted: 9 June 2020
In this paper, an auto-tuning piezoelectric energy harvester (PEH) based on the cantilever plate is presented by attaching a box to each corner of the free sides and placing a ball in each box. The prototype and supporting experimental fixtures were designed and manufactured. A series of hammering experiments are carried out to measure the natural frequency of the device according to different whole centroid position of the two balls. Seven excitation frequencies are selected to perform auto-tuning experiments, respectively. The two balls roll automatically to make the natural frequency of the structure consistent with the excitation, thereby resonating. The device is subjected to sweeping experiments. It can be seen from open circuit voltage-frequency and power-frequency diagrams that the auto-tuning PEH has a wider work frequency band as TFB and outputs higher voltage and power compared to cases where balls are fixed.
PACS: 43.38.Fx – Piezoelectric and ferroelectric transducers / 43.60.Qv – Signal processing instrumentation, integrated systems, smart transducers, devices and architectures, displays and interfaces for acoustic systems
© EPLA, 2020
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