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Open AccessArticle

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.
Sensors 2018, 18(7), 2182; https://doi.org/10.3390/s18072182
Received: 1 June 2018 / Revised: 4 July 2018 / Accepted: 5 July 2018 / Published: 6 July 2018
(This article belongs to the Section Physical Sensors)
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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MDPI and ACS Style

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. https://doi.org/10.3390/s18072182

AMA Style

Joh S-H, Magno K, Hwang SH. Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and Strain. Sensors. 2018; 18(7):2182. https://doi.org/10.3390/s18072182

Chicago/Turabian Style

Joh, Sung-Ho; Magno, Katherine; Hwang, Sung H. 2018. "Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and Strain" Sensors 18, no. 7: 2182. https://doi.org/10.3390/s18072182

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