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Study on MFL Technology for Defect Detection of Railroad Track Under Speed-up Condition
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 Title & Authors
Study on MFL Technology for Defect Detection of Railroad Track Under Speed-up Condition
Kang, Donghoon; Oh, Ji-Taek; Kim, Ju-Won; Park, Seunghee;
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Defects generated in a railroad track that guides the railroad vehicle have the characteristic of growing fast; as such, the detection technology for railroad track defects is very important because defects can eventually cause mass disasters like derailments. In this study, a speed-up test facility was fabricated to investigate the feasibility of using magnetic flux leakage (MFL) technology for defect detection in a railroad track under speed-up condition; a test was conducted using a railroad track specimen with defects. For this purpose, an MFL sensor head dedicated to the configuration of the railroad was designed and test specimens with artificial defects on their surfaces were manufactured. Using the test facility, a speed-up test ranging from 4km/h to 12km/h was performed and defects including locations were successfully detected from MFL signals induced by defects with enhanced visibility by differentiating raw MFL signals. In the future, it should be possible to apply this system to a high-speed railroad inspection car by improving the lift-off stability that is necessary for speed-up of the developed MFL sensor system.
Railroad track;Defect detection;Magnetic flux leakage;Speed-up test;
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