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