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Piezoelectric bimorphs' characteristics as in-socket sensors for transfemoral amputees

Alternative sensory systems for the development of prosthetic knees are being increasingly highlighted nowadays, due to the rapid advancements in the field of lower limb prosthetics. This study presents the use of piezoelectric bimorphs as in-socket sensors for transfemoral amputees. An Instron mach...

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Main Authors: El-Sayed, Amr M., Hamzaid, Nur Azah, Abu Osman, Noor Azuan
Format: Article
Published: MDPI 2014
Subjects:
Q Science (General)
Online Access:http://eprints.um.edu.my/15550/
https://doi.org/10.3390/s141223724
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spelling my.um.eprints.155502021-02-26T04:18:12Z http://eprints.um.edu.my/15550/ Piezoelectric bimorphs' characteristics as in-socket sensors for transfemoral amputees El-Sayed, Amr M. Hamzaid, Nur Azah Abu Osman, Noor Azuan Q Science (General) Alternative sensory systems for the development of prosthetic knees are being increasingly highlighted nowadays, due to the rapid advancements in the field of lower limb prosthetics. This study presents the use of piezoelectric bimorphs as in-socket sensors for transfemoral amputees. An Instron machine was used in the calibration procedure and the corresponding output data were further analyzed to determine the static and dynamic characteristics of the piezoelectric bimorph. The piezoelectric bimorph showed appropriate static operating range, repeatability, hysteresis, and frequency response for application in lower prosthesis, with a force range of 0-100 N. To further validate this finding, an experiment was conducted with a single transfemoral amputee subject to measure the stump/socket pressure using the piezoelectric bimorph embedded inside the socket. The results showed that a maximum interface pressure of about 27 kPa occurred at the anterior proximal site compared to the anterior distal and posterior sites, consistent with values published in other studies. This paper highlighted the capacity of piezoelectric bimorphs to perform as in-socket sensors for transfemoral amputees. However, further experiments are recommended to be conducted with different amputees with different socket types. MDPI 2014 Article PeerReviewed El-Sayed, Amr M. and Hamzaid, Nur Azah and Abu Osman, Noor Azuan (2014) Piezoelectric bimorphs' characteristics as in-socket sensors for transfemoral amputees. Sensors, 14 (12). pp. 23724-23741. ISSN 1424-8220 https://doi.org/10.3390/s141223724 doi:10.3390/s141223724
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic Q Science (General)
spellingShingle Q Science (General)
El-Sayed, Amr M.
Hamzaid, Nur Azah
Abu Osman, Noor Azuan
Piezoelectric bimorphs' characteristics as in-socket sensors for transfemoral amputees
description Alternative sensory systems for the development of prosthetic knees are being increasingly highlighted nowadays, due to the rapid advancements in the field of lower limb prosthetics. This study presents the use of piezoelectric bimorphs as in-socket sensors for transfemoral amputees. An Instron machine was used in the calibration procedure and the corresponding output data were further analyzed to determine the static and dynamic characteristics of the piezoelectric bimorph. The piezoelectric bimorph showed appropriate static operating range, repeatability, hysteresis, and frequency response for application in lower prosthesis, with a force range of 0-100 N. To further validate this finding, an experiment was conducted with a single transfemoral amputee subject to measure the stump/socket pressure using the piezoelectric bimorph embedded inside the socket. The results showed that a maximum interface pressure of about 27 kPa occurred at the anterior proximal site compared to the anterior distal and posterior sites, consistent with values published in other studies. This paper highlighted the capacity of piezoelectric bimorphs to perform as in-socket sensors for transfemoral amputees. However, further experiments are recommended to be conducted with different amputees with different socket types.
format Article
author El-Sayed, Amr M.
Hamzaid, Nur Azah
Abu Osman, Noor Azuan
author_facet El-Sayed, Amr M.
Hamzaid, Nur Azah
Abu Osman, Noor Azuan
author_sort El-Sayed, Amr M.
title Piezoelectric bimorphs' characteristics as in-socket sensors for transfemoral amputees
title_short Piezoelectric bimorphs' characteristics as in-socket sensors for transfemoral amputees
title_full Piezoelectric bimorphs' characteristics as in-socket sensors for transfemoral amputees
title_fullStr Piezoelectric bimorphs' characteristics as in-socket sensors for transfemoral amputees
title_full_unstemmed Piezoelectric bimorphs' characteristics as in-socket sensors for transfemoral amputees
title_sort piezoelectric bimorphs' characteristics as in-socket sensors for transfemoral amputees
publisher MDPI
publishDate 2014
url http://eprints.um.edu.my/15550/
https://doi.org/10.3390/s141223724
_version_ 1692992293462605824
score 13.211869

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