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Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and Strain

Dynamic deflection of a railroad sleeper works as an indicator of ballast stiffness, reflecting the health conditions of a ballast track. However, difficulty exists in measuring dynamic deflection of a railroad sleeper by conventional deflection transducers such as a linear variable differential tra...

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Autores principales: Joh, Sung-Ho, Magno, Katherine, Hwang, Sung Ho
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6068745/
https://www.ncbi.nlm.nih.gov/pubmed/29986469
http://dx.doi.org/10.3390/s18072182
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author Joh, Sung-Ho
Magno, Katherine
Hwang, Sung Ho
author_facet Joh, Sung-Ho
Magno, Katherine
Hwang, Sung Ho
author_sort Joh, Sung-Ho
collection PubMed
description Dynamic deflection of a railroad sleeper works as an indicator of ballast stiffness, reflecting the health conditions of a ballast track. However, difficulty exists in measuring dynamic deflection of a railroad sleeper by conventional deflection transducers such as a linear variable differential transformer (LVDT) or a potentiometer. This is because a fixed reference point is unattainable due to ground vibrations during train passage. In this paper, a patented signal processing technique for evaluation of pseudo-deflection is presented to recover dynamic deflection of a railroad sleeper using a coupled measurement of acceleration and strain at the concrete sleeper. The presented technique combines high-frequency deflections calculated from double integration of acceleration and low-frequency deflections determined from strains. Validity of the combined deflections was shown by the deflections measured with a camera target on a concrete sleeper, captured by a high-resolution DSLR camera with superb video capturing features and processed by computer vision techniques, such as Canny edge detection and Blob analysis.
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spelling pubmed-60687452018-08-07 Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and Strain Joh, Sung-Ho Magno, Katherine Hwang, Sung Ho Sensors (Basel) Article Dynamic deflection of a railroad sleeper works as an indicator of ballast stiffness, reflecting the health conditions of a ballast track. However, difficulty exists in measuring dynamic deflection of a railroad sleeper by conventional deflection transducers such as a linear variable differential transformer (LVDT) or a potentiometer. This is because a fixed reference point is unattainable due to ground vibrations during train passage. In this paper, a patented signal processing technique for evaluation of pseudo-deflection is presented to recover dynamic deflection of a railroad sleeper using a coupled measurement of acceleration and strain at the concrete sleeper. The presented technique combines high-frequency deflections calculated from double integration of acceleration and low-frequency deflections determined from strains. Validity of the combined deflections was shown by the deflections measured with a camera target on a concrete sleeper, captured by a high-resolution DSLR camera with superb video capturing features and processed by computer vision techniques, such as Canny edge detection and Blob analysis. MDPI 2018-07-06 /pmc/articles/PMC6068745/ /pubmed/29986469 http://dx.doi.org/10.3390/s18072182 Text en © 2018 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Joh, Sung-Ho
Magno, Katherine
Hwang, Sung Ho
Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and Strain
title Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and Strain
title_full Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and Strain
title_fullStr Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and Strain
title_full_unstemmed Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and Strain
title_short Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and Strain
title_sort dynamic deflection of a railroad sleeper from the coupled measurements of acceleration and strain
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6068745/
https://www.ncbi.nlm.nih.gov/pubmed/29986469
http://dx.doi.org/10.3390/s18072182
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