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Impact Velocity Measurement Method Based on Trajectory and Impact Position

The impact velocity of falling weight is an instantaneous quantity. Currently, measurement of impact velocity relies on high-speed sensors to capture the moment of impact. The trajectory-position measurement method (TPMM) is proposed in this study. The main steps are: (1) The impact position is used...

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Detalles Bibliográficos
Autores principales: Liu, Hui, Wang, Jingfan, Wu, Yuantao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9657564/
https://www.ncbi.nlm.nih.gov/pubmed/36365985
http://dx.doi.org/10.3390/s22218288
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author Liu, Hui
Wang, Jingfan
Wu, Yuantao
author_facet Liu, Hui
Wang, Jingfan
Wu, Yuantao
author_sort Liu, Hui
collection PubMed
description The impact velocity of falling weight is an instantaneous quantity. Currently, measurement of impact velocity relies on high-speed sensors to capture the moment of impact. The trajectory-position measurement method (TPMM) is proposed in this study. The main steps are: (1) The impact position is used to capture the impact time. It can be measured when the falling weight is stationary. (2) The discrete falling trajectory is measured and a new empirical regression algorithm is proposed to fit the expression of falling trajectory. (3) The impact velocity is obtained by taking the impact time into the first derivative of the trajectory expression. For 1–5 m falling height, the simulation shows that the relative maximum error and relative expanded uncertainty of the proposed method are less than 0.481% and 0.442%, respectively. Then, the actual experiment is carried out to verify the simulation. The proposed method has high accuracy and low uncertainty. The reasons are: (1) Only a low-speed displacement sensor is need for impact velocity measurement. It is easier to improve accuracy and stability of a low-speed sensor. (2) The empirical regression algorithm can improve the stability of falling trajectory fitting.
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spelling pubmed-96575642022-11-15 Impact Velocity Measurement Method Based on Trajectory and Impact Position Liu, Hui Wang, Jingfan Wu, Yuantao Sensors (Basel) Article The impact velocity of falling weight is an instantaneous quantity. Currently, measurement of impact velocity relies on high-speed sensors to capture the moment of impact. The trajectory-position measurement method (TPMM) is proposed in this study. The main steps are: (1) The impact position is used to capture the impact time. It can be measured when the falling weight is stationary. (2) The discrete falling trajectory is measured and a new empirical regression algorithm is proposed to fit the expression of falling trajectory. (3) The impact velocity is obtained by taking the impact time into the first derivative of the trajectory expression. For 1–5 m falling height, the simulation shows that the relative maximum error and relative expanded uncertainty of the proposed method are less than 0.481% and 0.442%, respectively. Then, the actual experiment is carried out to verify the simulation. The proposed method has high accuracy and low uncertainty. The reasons are: (1) Only a low-speed displacement sensor is need for impact velocity measurement. It is easier to improve accuracy and stability of a low-speed sensor. (2) The empirical regression algorithm can improve the stability of falling trajectory fitting. MDPI 2022-10-28 /pmc/articles/PMC9657564/ /pubmed/36365985 http://dx.doi.org/10.3390/s22218288 Text en © 2022 by the authors. 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
Liu, Hui
Wang, Jingfan
Wu, Yuantao
Impact Velocity Measurement Method Based on Trajectory and Impact Position
title Impact Velocity Measurement Method Based on Trajectory and Impact Position
title_full Impact Velocity Measurement Method Based on Trajectory and Impact Position
title_fullStr Impact Velocity Measurement Method Based on Trajectory and Impact Position
title_full_unstemmed Impact Velocity Measurement Method Based on Trajectory and Impact Position
title_short Impact Velocity Measurement Method Based on Trajectory and Impact Position
title_sort impact velocity measurement method based on trajectory and impact position
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9657564/
https://www.ncbi.nlm.nih.gov/pubmed/36365985
http://dx.doi.org/10.3390/s22218288
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AT wangjingfan impactvelocitymeasurementmethodbasedontrajectoryandimpactposition
AT wuyuantao impactvelocitymeasurementmethodbasedontrajectoryandimpactposition