Analysis of wheel-rail adhesion redundancy considering the third-body medium on the rail surface
Purpose – In response to the problem of insufficient traction/braking adhesion force caused by the existence of the third-body medium on the rail surface, this study aims to analyze the utilization of wheel-rail adhesion coefficient under different medium conditions and propose relevant measures for...
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| Language: | English |
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Emerald Publishing
2024-04-01
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| Series: | Railway Sciences |
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| Online Access: | https://www.emerald.com/insight/content/doi/10.1108/RS-12-2023-0051/full/pdf |
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| author | Chun Tian Gengwei Zhai Mengling Wu Jiajun Zhou Yaojie Li |
| author_facet | Chun Tian Gengwei Zhai Mengling Wu Jiajun Zhou Yaojie Li |
| author_sort | Chun Tian |
| collection | DOAJ |
| description | Purpose – In response to the problem of insufficient traction/braking adhesion force caused by the existence of the third-body medium on the rail surface, this study aims to analyze the utilization of wheel-rail adhesion coefficient under different medium conditions and propose relevant measures for reasonable and optimized utilization of adhesion to ensure the traction/braking performance and operation safety of trains. Design/methodology/approach – Based on the PLS-160 wheel-rail adhesion simulation test rig, the study investigates the variation patterns of maximum utilized adhesion characteristics on the rail surface under different conditions of small creepage and large slip. Through statistical analysis of multiple sets of experimental data, the statistical distribution patterns of maximum utilized adhesion on the rail surface are obtained, and a method for analyzing wheel-rail adhesion redundancy based on normal distribution is proposed. The study analyzes the utilization of traction/braking adhesion, as well as adhesion redundancy, for different medium under small creepage and large slip conditions. Based on these findings, relevant measures for the reasonable and optimized utilization of adhesion are derived. Findings – When the third-body medium exists on the rail surface, the train should adopt the low-level service braking to avoid the braking skidding by extending the braking distance. Compared with the current adhesion control strategy of small creepage, adopting appropriate strategies to control the train’s adhesion coefficient near the second peak point of the adhesion coefficient-slip ratio curve in large slip can effectively improve the traction/braking adhesion redundancy and the upper limit of adhesion utilization, thereby ensuring the traction/braking performance and operation safety of the train. Originality/value – Most existing studies focus on the wheel-rail adhesion coefficient values and variation patterns under different medium conditions, without considering whether the rail surface with different medium can provide sufficient traction/braking utilized adhesion coefficient for the train. Therefore, there is a risk of traction overspeeding/braking skidding. This study analyzes whether the rail surface with different medium can provide sufficient traction/braking utilized adhesion coefficient for the train and whether there is redundancy. Based on these findings, relevant measures for the reasonable and optimized utilization of adhesion are derived to further ensure operation safety of the train. |
| format | Article |
| id | doaj-art-78e6072d57a241b581664ab4e75d6ccc |
| institution | OA Journals |
| issn | 2755-0907 2755-0915 |
| language | English |
| publishDate | 2024-04-01 |
| publisher | Emerald Publishing |
| record_format | Article |
| series | Railway Sciences |
| spelling | doaj-art-78e6072d57a241b581664ab4e75d6ccc2025-08-20T02:10:32ZengEmerald PublishingRailway Sciences2755-09072755-09152024-04-013215617610.1108/RS-12-2023-0051Analysis of wheel-rail adhesion redundancy considering the third-body medium on the rail surfaceChun Tian0Gengwei Zhai1Mengling Wu2Jiajun Zhou3Yaojie Li4Institute of Rail Transit, Tongji University, Shanghai, ChinaInstitute of Rail Transit, Tongji University, Shanghai, ChinaInstitute of Rail Transit, Tongji University, Shanghai, ChinaInstitute of Rail Transit, Tongji University, Shanghai, ChinaInstitute of Rail Transit, Tongji University, Shanghai, ChinaPurpose – In response to the problem of insufficient traction/braking adhesion force caused by the existence of the third-body medium on the rail surface, this study aims to analyze the utilization of wheel-rail adhesion coefficient under different medium conditions and propose relevant measures for reasonable and optimized utilization of adhesion to ensure the traction/braking performance and operation safety of trains. Design/methodology/approach – Based on the PLS-160 wheel-rail adhesion simulation test rig, the study investigates the variation patterns of maximum utilized adhesion characteristics on the rail surface under different conditions of small creepage and large slip. Through statistical analysis of multiple sets of experimental data, the statistical distribution patterns of maximum utilized adhesion on the rail surface are obtained, and a method for analyzing wheel-rail adhesion redundancy based on normal distribution is proposed. The study analyzes the utilization of traction/braking adhesion, as well as adhesion redundancy, for different medium under small creepage and large slip conditions. Based on these findings, relevant measures for the reasonable and optimized utilization of adhesion are derived. Findings – When the third-body medium exists on the rail surface, the train should adopt the low-level service braking to avoid the braking skidding by extending the braking distance. Compared with the current adhesion control strategy of small creepage, adopting appropriate strategies to control the train’s adhesion coefficient near the second peak point of the adhesion coefficient-slip ratio curve in large slip can effectively improve the traction/braking adhesion redundancy and the upper limit of adhesion utilization, thereby ensuring the traction/braking performance and operation safety of the train. Originality/value – Most existing studies focus on the wheel-rail adhesion coefficient values and variation patterns under different medium conditions, without considering whether the rail surface with different medium can provide sufficient traction/braking utilized adhesion coefficient for the train. Therefore, there is a risk of traction overspeeding/braking skidding. This study analyzes whether the rail surface with different medium can provide sufficient traction/braking utilized adhesion coefficient for the train and whether there is redundancy. Based on these findings, relevant measures for the reasonable and optimized utilization of adhesion are derived to further ensure operation safety of the train.https://www.emerald.com/insight/content/doi/10.1108/RS-12-2023-0051/full/pdfWheel-rail adhesion redundancyPLS-160 wheel-rail adhesion simulation test rigNormal distributionUtilized adhesion coefficient |
| spellingShingle | Chun Tian Gengwei Zhai Mengling Wu Jiajun Zhou Yaojie Li Analysis of wheel-rail adhesion redundancy considering the third-body medium on the rail surface Railway Sciences Wheel-rail adhesion redundancy PLS-160 wheel-rail adhesion simulation test rig Normal distribution Utilized adhesion coefficient |
| title | Analysis of wheel-rail adhesion redundancy considering the third-body medium on the rail surface |
| title_full | Analysis of wheel-rail adhesion redundancy considering the third-body medium on the rail surface |
| title_fullStr | Analysis of wheel-rail adhesion redundancy considering the third-body medium on the rail surface |
| title_full_unstemmed | Analysis of wheel-rail adhesion redundancy considering the third-body medium on the rail surface |
| title_short | Analysis of wheel-rail adhesion redundancy considering the third-body medium on the rail surface |
| title_sort | analysis of wheel rail adhesion redundancy considering the third body medium on the rail surface |
| topic | Wheel-rail adhesion redundancy PLS-160 wheel-rail adhesion simulation test rig Normal distribution Utilized adhesion coefficient |
| url | https://www.emerald.com/insight/content/doi/10.1108/RS-12-2023-0051/full/pdf |
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