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Biomechanical knee energy harvester: Design optimization and testing
Biomechanical energy harvesters are designed to generate electrical energy from human locomotion (e.g., walking) with minimal or no additional effort by the users. These harvesters aim to carry out the work of the muscles during phases in locomotion where the muscles are acting as brakes. Currently,...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Frontiers Media S.A.
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9581163/ https://www.ncbi.nlm.nih.gov/pubmed/36274915 http://dx.doi.org/10.3389/frobt.2022.998248 |
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author | Gad, Moran Lev-Ari, Ben Shapiro, Amir Ben-David, Coral Riemer, Raziel |
author_facet | Gad, Moran Lev-Ari, Ben Shapiro, Amir Ben-David, Coral Riemer, Raziel |
author_sort | Gad, Moran |
collection | PubMed |
description | Biomechanical energy harvesters are designed to generate electrical energy from human locomotion (e.g., walking) with minimal or no additional effort by the users. These harvesters aim to carry out the work of the muscles during phases in locomotion where the muscles are acting as brakes. Currently, many harvesters focus on the knee joint during late swing, which is only one of three phases available during the gait cycle. For the device to be successful, there is a need to consider design components such as the motor/generator and the gear ratio. These components influence the amount of electrical energy that could be harvested, metabolic power during harvesting, and more. These various components make it challenging to achieve the optimal design. This paper presents a design of a knee harvester with a direct drive that enables harvesting both in flexion and extension using optimization. Subsequently, two knee devices were built and tested using five different harvesting levels. Results show that the 30% level was the best, harvesting approximately 5 W of electricity and redacting 8 W of metabolic energy compared to walking with the device as a dead weight. Evaluation of the models used in the optimization showed a good match to the system model but less for the metabolic power model. These results could pave the way for an energy harvester that could utilize more of the negative joint power during the gait cycle while reducing metabolic effort. |
format | Online Article Text |
id | pubmed-9581163 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-95811632022-10-20 Biomechanical knee energy harvester: Design optimization and testing Gad, Moran Lev-Ari, Ben Shapiro, Amir Ben-David, Coral Riemer, Raziel Front Robot AI Robotics and AI Biomechanical energy harvesters are designed to generate electrical energy from human locomotion (e.g., walking) with minimal or no additional effort by the users. These harvesters aim to carry out the work of the muscles during phases in locomotion where the muscles are acting as brakes. Currently, many harvesters focus on the knee joint during late swing, which is only one of three phases available during the gait cycle. For the device to be successful, there is a need to consider design components such as the motor/generator and the gear ratio. These components influence the amount of electrical energy that could be harvested, metabolic power during harvesting, and more. These various components make it challenging to achieve the optimal design. This paper presents a design of a knee harvester with a direct drive that enables harvesting both in flexion and extension using optimization. Subsequently, two knee devices were built and tested using five different harvesting levels. Results show that the 30% level was the best, harvesting approximately 5 W of electricity and redacting 8 W of metabolic energy compared to walking with the device as a dead weight. Evaluation of the models used in the optimization showed a good match to the system model but less for the metabolic power model. These results could pave the way for an energy harvester that could utilize more of the negative joint power during the gait cycle while reducing metabolic effort. Frontiers Media S.A. 2022-10-05 /pmc/articles/PMC9581163/ /pubmed/36274915 http://dx.doi.org/10.3389/frobt.2022.998248 Text en Copyright © 2022 Gad, Lev-Ari, Shapiro, Ben-David and Riemer. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Robotics and AI Gad, Moran Lev-Ari, Ben Shapiro, Amir Ben-David, Coral Riemer, Raziel Biomechanical knee energy harvester: Design optimization and testing |
title | Biomechanical knee energy harvester: Design optimization and testing |
title_full | Biomechanical knee energy harvester: Design optimization and testing |
title_fullStr | Biomechanical knee energy harvester: Design optimization and testing |
title_full_unstemmed | Biomechanical knee energy harvester: Design optimization and testing |
title_short | Biomechanical knee energy harvester: Design optimization and testing |
title_sort | biomechanical knee energy harvester: design optimization and testing |
topic | Robotics and AI |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9581163/ https://www.ncbi.nlm.nih.gov/pubmed/36274915 http://dx.doi.org/10.3389/frobt.2022.998248 |
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