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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-07-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/18/7/2182 |
| _version_ | 1818037530054885376 |
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| author | Sung-Ho Joh Katherine Magno Sung Ho Hwang |
| author_facet | Sung-Ho Joh Katherine Magno Sung Ho Hwang |
| author_sort | Sung-Ho Joh |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-10T07:28:18Z |
| format | Article |
| id | doaj.art-342ab1ca603a4d88adbd5518ce91d6b8 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-12-10T07:28:18Z |
| publishDate | 2018-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-342ab1ca603a4d88adbd5518ce91d6b82022-12-22T01:57:39ZengMDPI AGSensors1424-82202018-07-01187218210.3390/s18072182s18072182Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and StrainSung-Ho Joh0Katherine Magno1Sung Ho Hwang2Department of Civil and Environmental Engineering, Chung-Ang University, Seoul 06974, KoreaDepartment of Civil and Environmental Engineering, Chung-Ang University, Seoul 06974, KoreaAdvanced Railroad Civil Engineering Division, Korean Research Railroad Institute, Gyeonggi-do 16105, KoreaDynamic 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.http://www.mdpi.com/1424-8220/18/7/2182deflectionrailroad sleeperstructural health monitoringballast trackcomputer vision |
| spellingShingle | Sung-Ho Joh Katherine Magno Sung Ho Hwang Dynamic Deflection of a Railroad Sleeper from the Coupled Measurements of Acceleration and Strain Sensors deflection railroad sleeper structural health monitoring ballast track computer vision |
| 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 | deflection railroad sleeper structural health monitoring ballast track computer vision |
| url | http://www.mdpi.com/1424-8220/18/7/2182 |
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