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Title: Broadband electromagnetic power harvester from vibrations via frequency conversion by impact oscillations

Abstract

In this paper, we propose an electromagnetic power harvester that uses a transformative multi-impact approach to achieve a wide bandwidth response from low frequency vibration sources through frequency-up conversion. The device consists of a pick-up coil, fixed at the free edge of a cantilever beam with high resonant frequency, and two cantilever beams with low excitation frequencies, each with an impact mass attached at its free edge. One of the two cantilevers is designed to resonate at 25 Hz, while the other resonates at 50 Hz within the range of ambient vibration frequency. When the device is subjected to a low frequency vibration, the two low-frequency cantilevers responded by vibrating at low frequencies, and thus their thick metallic masses made impacts with the high resonance frequency cantilever repeatedly at two locations. This has caused it along with the pick-up coil to oscillate, relative to the permanent magnet, with decaying amplitude at its resonance frequency, and results in a wide bandwidth response from 10 to 63 Hz at 2 g. A wide bandwidth response between 10–51 Hz and 10–58 Hz at acceleration values of 0.5 g and 2 g, respectively, were achieved by adjusting the impact cantilever frequencies closer to each other (25 Hz and 45 Hz). A maximum output powermore » of 85 μW was achieved at 5 g at 30 Hz across a load resistor, 2.68 Ω.« less

Authors:
;  [1];  [2]
  1. Electrical and Computer Engineering, University of Missouri, Columbia, Missouri 65211 (United States)
  2. Mechanical and Aerospace Engineering, University of Missouri, Columbia, Missouri 65211 (United States)
Publication Date:
OSTI Identifier:
22303543
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 105; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACCELERATION; BEAMS; CONVERSION; DECAY AMPLITUDES; EXCITATION; MASS; OSCILLATIONS; PERMANENT MAGNETS; RESISTORS; RESONANCE

Citation Formats

Yuksek, N. S., Almasri, M., and Feng, Z. C. Broadband electromagnetic power harvester from vibrations via frequency conversion by impact oscillations. United States: N. p., 2014. Web. doi:10.1063/1.4895927.
Yuksek, N. S., Almasri, M., & Feng, Z. C. Broadband electromagnetic power harvester from vibrations via frequency conversion by impact oscillations. United States. https://doi.org/10.1063/1.4895927
Yuksek, N. S., Almasri, M., and Feng, Z. C. Mon . "Broadband electromagnetic power harvester from vibrations via frequency conversion by impact oscillations". United States. https://doi.org/10.1063/1.4895927.
@article{osti_22303543,
title = {Broadband electromagnetic power harvester from vibrations via frequency conversion by impact oscillations},
author = {Yuksek, N. S. and Almasri, M. and Feng, Z. C.},
abstractNote = {In this paper, we propose an electromagnetic power harvester that uses a transformative multi-impact approach to achieve a wide bandwidth response from low frequency vibration sources through frequency-up conversion. The device consists of a pick-up coil, fixed at the free edge of a cantilever beam with high resonant frequency, and two cantilever beams with low excitation frequencies, each with an impact mass attached at its free edge. One of the two cantilevers is designed to resonate at 25 Hz, while the other resonates at 50 Hz within the range of ambient vibration frequency. When the device is subjected to a low frequency vibration, the two low-frequency cantilevers responded by vibrating at low frequencies, and thus their thick metallic masses made impacts with the high resonance frequency cantilever repeatedly at two locations. This has caused it along with the pick-up coil to oscillate, relative to the permanent magnet, with decaying amplitude at its resonance frequency, and results in a wide bandwidth response from 10 to 63 Hz at 2 g. A wide bandwidth response between 10–51 Hz and 10–58 Hz at acceleration values of 0.5 g and 2 g, respectively, were achieved by adjusting the impact cantilever frequencies closer to each other (25 Hz and 45 Hz). A maximum output power of 85 μW was achieved at 5 g at 30 Hz across a load resistor, 2.68 Ω.},
doi = {10.1063/1.4895927},
url = {https://www.osti.gov/biblio/22303543}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 11,
volume = 105,
place = {United States},
year = {2014},
month = {9}
}