Study on evaluation of rail axial stress with ultrasonic wave method (Application of wavelet transform results)
The part of rail joint becomes the cause of the disadvantage points such as ride discomfort, undesired sound and track maintenance, etc. For restraining those points, the long rail made by welding the standard length rails has been developed. However, the problems of the buckling caused by the axial...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2019-11-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/85/880/85_19-00206/_pdf/-char/en |
| _version_ | 1797989016478416896 |
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| author | Keisuke OOSUMI Masanori TAKUMA Kenichi SAITOH Yoshimasa TAKAHASHI Tomohiro SATO Ken YAMAMOTO |
| author_facet | Keisuke OOSUMI Masanori TAKUMA Kenichi SAITOH Yoshimasa TAKAHASHI Tomohiro SATO Ken YAMAMOTO |
| author_sort | Keisuke OOSUMI |
| collection | DOAJ |
| description | The part of rail joint becomes the cause of the disadvantage points such as ride discomfort, undesired sound and track maintenance, etc. For restraining those points, the long rail made by welding the standard length rails has been developed. However, the problems of the buckling caused by the axial stress (i.e. the thermal stress which is brought out by the weather conditions or the friction heat between wheel and rail) of the rail have been pointed out. Therefore, some evaluation techniques for buckling management have been proposed. In this study, the relationship between the increase in compressive stress and the behaviors of the characteristics of the wavelet transform (i.e. a kind of time-frequency analysis) results of ultrasonic echoes was researched. The stress was increased in 10 [MPa] interval, and the echo at each stress was detected. From the results of experiment and analysis, it became clear that there is the relatively correlation between three characteristics and the stress. They are RMWC, RWE and RKTW respectively. The value of each RMWC, RWE and RKTW shows the ratio to the initial value (i.e. shows at 0[MPa] in this case) of MWC (i.e. the maximum wavelet coefficient), WE (i.e. wavelet energy) and KTW (i.e. the kurtosis of the time fluctuation waveform of the wavelet coefficient of the frequency that indicates MWC). Therefore, it was able to show the possibility of comparatively accurately predicting the increment of the stress by comparing the transitions of those. |
| first_indexed | 2024-04-11T08:12:17Z |
| format | Article |
| id | doaj.art-3f7efd90e5a04c1c8329faa30d76bdc1 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T08:12:17Z |
| publishDate | 2019-11-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-3f7efd90e5a04c1c8329faa30d76bdc12022-12-22T04:35:16ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612019-11-018588019-0020619-0020610.1299/transjsme.19-00206transjsmeStudy on evaluation of rail axial stress with ultrasonic wave method (Application of wavelet transform results)Keisuke OOSUMI0Masanori TAKUMA1Kenichi SAITOH2Yoshimasa TAKAHASHI3Tomohiro SATO4Ken YAMAMOTO5Railtec Co., LTD.Kansai Univ. of Dept. of Mechanical EngineeringKansai Univ. of Dept. of Mechanical EngineeringKansai Univ. of Dept. of Mechanical EngineeringKansai Univ. of Dept. of Mechanical EngineeringKansai Univ. of Dept. of Pure and Applied PhysicsThe part of rail joint becomes the cause of the disadvantage points such as ride discomfort, undesired sound and track maintenance, etc. For restraining those points, the long rail made by welding the standard length rails has been developed. However, the problems of the buckling caused by the axial stress (i.e. the thermal stress which is brought out by the weather conditions or the friction heat between wheel and rail) of the rail have been pointed out. Therefore, some evaluation techniques for buckling management have been proposed. In this study, the relationship between the increase in compressive stress and the behaviors of the characteristics of the wavelet transform (i.e. a kind of time-frequency analysis) results of ultrasonic echoes was researched. The stress was increased in 10 [MPa] interval, and the echo at each stress was detected. From the results of experiment and analysis, it became clear that there is the relatively correlation between three characteristics and the stress. They are RMWC, RWE and RKTW respectively. The value of each RMWC, RWE and RKTW shows the ratio to the initial value (i.e. shows at 0[MPa] in this case) of MWC (i.e. the maximum wavelet coefficient), WE (i.e. wavelet energy) and KTW (i.e. the kurtosis of the time fluctuation waveform of the wavelet coefficient of the frequency that indicates MWC). Therefore, it was able to show the possibility of comparatively accurately predicting the increment of the stress by comparing the transitions of those.https://www.jstage.jst.go.jp/article/transjsme/85/880/85_19-00206/_pdf/-char/enrailwaycontinuous welded railbucklingcompression testnondestructive inspectionultrasonic wavewavelet transform |
| spellingShingle | Keisuke OOSUMI Masanori TAKUMA Kenichi SAITOH Yoshimasa TAKAHASHI Tomohiro SATO Ken YAMAMOTO Study on evaluation of rail axial stress with ultrasonic wave method (Application of wavelet transform results) Nihon Kikai Gakkai ronbunshu railway continuous welded rail buckling compression test nondestructive inspection ultrasonic wave wavelet transform |
| title | Study on evaluation of rail axial stress with ultrasonic wave method (Application of wavelet transform results) |
| title_full | Study on evaluation of rail axial stress with ultrasonic wave method (Application of wavelet transform results) |
| title_fullStr | Study on evaluation of rail axial stress with ultrasonic wave method (Application of wavelet transform results) |
| title_full_unstemmed | Study on evaluation of rail axial stress with ultrasonic wave method (Application of wavelet transform results) |
| title_short | Study on evaluation of rail axial stress with ultrasonic wave method (Application of wavelet transform results) |
| title_sort | study on evaluation of rail axial stress with ultrasonic wave method application of wavelet transform results |
| topic | railway continuous welded rail buckling compression test nondestructive inspection ultrasonic wave wavelet transform |
| url | https://www.jstage.jst.go.jp/article/transjsme/85/880/85_19-00206/_pdf/-char/en |
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