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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...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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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. |
format | Online Article Text |
id | pubmed-6068745 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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