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Enhancement of harvesting capability of coupled nonlinear energy harvesters through high energy orbits / P. V. Malaji, Michael Friswell, Sondipon Adhikari, G. Litak

AIP Advances, Volume: 10, Issue: 8

Swansea University Authors: Michael Friswell, Sondipon Adhikari

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DOI (Published version): 10.1063/5.0014426

Abstract

Mechanical coupling in similar energy harvesters has the potential to enhance their broadband harvesting capability. However, often the performance of one harvester dominates the other, and the coupling transfers energy from the high frequency harvester to the low frequency harvester, thus reducing...

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Published in: AIP Advances
ISSN: 2158-3226
Published: AIP Publishing 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa55159
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spelling 2020-10-28T14:08:24.7394309 v2 55159 2020-09-10 Enhancement of harvesting capability of coupled nonlinear energy harvesters through high energy orbits 5894777b8f9c6e64bde3568d68078d40 Michael Friswell Michael Friswell true false 4ea84d67c4e414f5ccbd7593a40f04d3 0000-0003-4181-3457 Sondipon Adhikari Sondipon Adhikari true false 2020-09-10 EEN Mechanical coupling in similar energy harvesters has the potential to enhance their broadband harvesting capability. However, often the performance of one harvester dominates the other, and the coupling transfers energy from the high frequency harvester to the low frequency harvester, thus reducing the capability of the high frequency harvester. Hence, researchers have proposed using the high frequency harvester only as an auxiliary oscillator to save the material cost. This paper investigates the possibility of enhancing the energy harvesting capability of both coupled harvesters. A torsionally coupled electromagnetic pendulum harvester system is considered, which is suitable for low frequency (<5 Hz) applications. The harmonic balance method is used to identify possible multiple solutions, and high magnitude solutions are observed to coexist with low magnitude solutions. These high energy solutions, which are often missed in the numerical simulation, can be attained by a careful choice of initial conditions or energy input. The simulation results show that more energy can be harvested over a wider range of frequencies by ensuring that the response occurs in the high energy orbits. The results show an enhancement of the bandwidth by 54% and 140% for the low and high frequency harvesters, respectively, with the optimum initial conditions. Moreover, an isolated frequency island is reported, which occurs due to the coupling of the nonlinear harvesters. Journal Article AIP Advances 10 8 AIP Publishing 2158-3226 11 8 2020 2020-08-11 10.1063/5.0014426 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2020-10-28T14:08:24.7394309 2020-09-10T10:23:46.1697719 P. V. Malaji 1 Michael Friswell 2 Sondipon Adhikari 0000-0003-4181-3457 3 G. Litak 4 55159__18139__3cbf2f478ad74947bdcef99537aad59b.pdf 55159.pdf 2020-09-10T10:25:26.0214005 Output 2058320 application/pdf Version of Record true © 2020 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license false eng
title Enhancement of harvesting capability of coupled nonlinear energy harvesters through high energy orbits
spellingShingle Enhancement of harvesting capability of coupled nonlinear energy harvesters through high energy orbits
Michael, Friswell
Sondipon, Adhikari
title_short Enhancement of harvesting capability of coupled nonlinear energy harvesters through high energy orbits
title_full Enhancement of harvesting capability of coupled nonlinear energy harvesters through high energy orbits
title_fullStr Enhancement of harvesting capability of coupled nonlinear energy harvesters through high energy orbits
title_full_unstemmed Enhancement of harvesting capability of coupled nonlinear energy harvesters through high energy orbits
title_sort Enhancement of harvesting capability of coupled nonlinear energy harvesters through high energy orbits
author_id_str_mv 5894777b8f9c6e64bde3568d68078d40
4ea84d67c4e414f5ccbd7593a40f04d3
author_id_fullname_str_mv 5894777b8f9c6e64bde3568d68078d40_***_Michael, Friswell
4ea84d67c4e414f5ccbd7593a40f04d3_***_Sondipon, Adhikari
author Michael, Friswell
Sondipon, Adhikari
author2 P. V. Malaji
Michael Friswell
Sondipon Adhikari
G. Litak
format Journal article
container_title AIP Advances
container_volume 10
container_issue 8
publishDate 2020
institution Swansea University
issn 2158-3226
doi_str_mv 10.1063/5.0014426
publisher AIP Publishing
document_store_str 1
active_str 0
description Mechanical coupling in similar energy harvesters has the potential to enhance their broadband harvesting capability. However, often the performance of one harvester dominates the other, and the coupling transfers energy from the high frequency harvester to the low frequency harvester, thus reducing the capability of the high frequency harvester. Hence, researchers have proposed using the high frequency harvester only as an auxiliary oscillator to save the material cost. This paper investigates the possibility of enhancing the energy harvesting capability of both coupled harvesters. A torsionally coupled electromagnetic pendulum harvester system is considered, which is suitable for low frequency (<5 Hz) applications. The harmonic balance method is used to identify possible multiple solutions, and high magnitude solutions are observed to coexist with low magnitude solutions. These high energy solutions, which are often missed in the numerical simulation, can be attained by a careful choice of initial conditions or energy input. The simulation results show that more energy can be harvested over a wider range of frequencies by ensuring that the response occurs in the high energy orbits. The results show an enhancement of the bandwidth by 54% and 140% for the low and high frequency harvesters, respectively, with the optimum initial conditions. Moreover, an isolated frequency island is reported, which occurs due to the coupling of the nonlinear harvesters.
published_date 2020-08-11T04:17:53Z
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