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A Piezoelectric Heterostructure Scavenging Mechanical Energy from Human Foot Strikes

This paper presents a piezoelectric heterostructure for extracting mechanical energy from human foot strikes based on the impact of a moving block on the tips of the piezoelectric unimorph cantilevers. The use of the magnetic springs allows low-frequency and high-amplitude movements of the device. T...

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Detalles Bibliográficos
Autor principal: He, Wei
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9413845/
https://www.ncbi.nlm.nih.gov/pubmed/36014275
http://dx.doi.org/10.3390/mi13081353
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author He, Wei
author_facet He, Wei
author_sort He, Wei
collection PubMed
description This paper presents a piezoelectric heterostructure for extracting mechanical energy from human foot strikes based on the impact of a moving block on the tips of the piezoelectric unimorph cantilevers. The use of the magnetic springs allows low-frequency and high-amplitude movements of the device. The piezoelectric unimorph cantilevers deform under a human foot strike on the pedal, and the piezoelectric elements in d(31)-mode produce output voltages. An analysis was conducted, and the working principle was stated. A prototype was fabricated to validate the feasibility of the proposed design. The experimental results show that the generated RMS voltage increases with human walking (running) speed. At the walking speed of 6 km/h, an average power of 36.26 μW is produced across a matching resistive load of 4 MΩ with an initial separating distance of 9 mm. Improvements of the device are possible, allowing an increase in the average power by increasing the number of piezoelectric unimorph cantilevers and using the piezoelectric materials with higher piezoelectric constants.
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spelling pubmed-94138452022-08-27 A Piezoelectric Heterostructure Scavenging Mechanical Energy from Human Foot Strikes He, Wei Micromachines (Basel) Article This paper presents a piezoelectric heterostructure for extracting mechanical energy from human foot strikes based on the impact of a moving block on the tips of the piezoelectric unimorph cantilevers. The use of the magnetic springs allows low-frequency and high-amplitude movements of the device. The piezoelectric unimorph cantilevers deform under a human foot strike on the pedal, and the piezoelectric elements in d(31)-mode produce output voltages. An analysis was conducted, and the working principle was stated. A prototype was fabricated to validate the feasibility of the proposed design. The experimental results show that the generated RMS voltage increases with human walking (running) speed. At the walking speed of 6 km/h, an average power of 36.26 μW is produced across a matching resistive load of 4 MΩ with an initial separating distance of 9 mm. Improvements of the device are possible, allowing an increase in the average power by increasing the number of piezoelectric unimorph cantilevers and using the piezoelectric materials with higher piezoelectric constants. MDPI 2022-08-20 /pmc/articles/PMC9413845/ /pubmed/36014275 http://dx.doi.org/10.3390/mi13081353 Text en © 2022 by the author. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
He, Wei
A Piezoelectric Heterostructure Scavenging Mechanical Energy from Human Foot Strikes
title A Piezoelectric Heterostructure Scavenging Mechanical Energy from Human Foot Strikes
title_full A Piezoelectric Heterostructure Scavenging Mechanical Energy from Human Foot Strikes
title_fullStr A Piezoelectric Heterostructure Scavenging Mechanical Energy from Human Foot Strikes
title_full_unstemmed A Piezoelectric Heterostructure Scavenging Mechanical Energy from Human Foot Strikes
title_short A Piezoelectric Heterostructure Scavenging Mechanical Energy from Human Foot Strikes
title_sort piezoelectric heterostructure scavenging mechanical energy from human foot strikes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9413845/
https://www.ncbi.nlm.nih.gov/pubmed/36014275
http://dx.doi.org/10.3390/mi13081353
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