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Sensors 2018, 18(7), 2182; https://doi.org/10.3390/s18072182

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

1
Department of Civil and Environmental Engineering, Chung-Ang University, Seoul 06974, Korea
2
Advanced Railroad Civil Engineering Division, Korean Research Railroad Institute, Gyeonggi-do 16105, Korea
*
Author to whom correspondence should be addressed.
Received: 1 June 2018 / Revised: 4 July 2018 / Accepted: 5 July 2018 / Published: 6 July 2018
(This article belongs to the Section Physical Sensors)
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Abstract

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. View Full-Text
Keywords: deflection; railroad sleeper; structural health monitoring; ballast track; computer vision deflection; railroad sleeper; structural health monitoring; ballast track; computer vision
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Joh, S.-H.; Magno, K.; Hwang, S.H. Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and Strain. Sensors 2018, 18, 2182.

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