Influence of Wheel-Rail Contact Algorithms on Running Safety Assessment of Trains under Earthquakes
Accurate running safety assessment of trains under earthquakes is crucial to ensuring the safety of line operation. Extreme contact behaviors such as wheel flange contact and wheel jump during earthquakes will directly affect the running safety of trains. To accurately simulate a wheel-rail extreme...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/9/5230 |
| _version_ | 1797603074539257856 |
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| author | Guanmian Cai Zhihui Zhu Wei Gong Gaoyang Zhou Lizhong Jiang Bailong Ye |
| author_facet | Guanmian Cai Zhihui Zhu Wei Gong Gaoyang Zhou Lizhong Jiang Bailong Ye |
| author_sort | Guanmian Cai |
| collection | DOAJ |
| description | Accurate running safety assessment of trains under earthquakes is crucial to ensuring the safety of line operation. Extreme contact behaviors such as wheel flange contact and wheel jump during earthquakes will directly affect the running safety of trains. To accurately simulate a wheel-rail extreme contact state, the calculation of the normal compression amount, the normal contact stiffness, and a number of contact points are crucial in wheel-rail space contact modeling. Hence, in order to clarify the applicable algorithms during earthquakes, this paper first introduces different algorithms in three aspects mentioned above. Taking a single CRH2 motor vehicle passing through a ballastless track structure under EI-Centro wave excitation as an example, a comparative analysis of wheel-rail contact dynamics and running safety was conducted. The results showed that adopting the normal compression algorithm based on vertical penetration and the consideration of only single-point contact will result in the maximum calculation error of wheel-rail contact force to reach 339.50% and 35.00%, respectively. This significantly affects the accuracy of train safety assessment, while using the empirical formula for wheel-rail normal contact stiffness has relatively less impact. To ensure the accuracy of running safety assessment of trains during an earthquake, it is recommended to adopt the normal compression algorithm based on normal penetration and consider the multi-point contact in wheel-rail contact modelling. |
| first_indexed | 2024-03-11T04:25:15Z |
| format | Article |
| id | doaj.art-88e60fe391f841ad85130b2e24413a75 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T04:25:15Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-88e60fe391f841ad85130b2e24413a752023-11-17T22:31:08ZengMDPI AGApplied Sciences2076-34172023-04-01139523010.3390/app13095230Influence of Wheel-Rail Contact Algorithms on Running Safety Assessment of Trains under EarthquakesGuanmian Cai0Zhihui Zhu1Wei Gong2Gaoyang Zhou3Lizhong Jiang4Bailong Ye5School of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaAccurate running safety assessment of trains under earthquakes is crucial to ensuring the safety of line operation. Extreme contact behaviors such as wheel flange contact and wheel jump during earthquakes will directly affect the running safety of trains. To accurately simulate a wheel-rail extreme contact state, the calculation of the normal compression amount, the normal contact stiffness, and a number of contact points are crucial in wheel-rail space contact modeling. Hence, in order to clarify the applicable algorithms during earthquakes, this paper first introduces different algorithms in three aspects mentioned above. Taking a single CRH2 motor vehicle passing through a ballastless track structure under EI-Centro wave excitation as an example, a comparative analysis of wheel-rail contact dynamics and running safety was conducted. The results showed that adopting the normal compression algorithm based on vertical penetration and the consideration of only single-point contact will result in the maximum calculation error of wheel-rail contact force to reach 339.50% and 35.00%, respectively. This significantly affects the accuracy of train safety assessment, while using the empirical formula for wheel-rail normal contact stiffness has relatively less impact. To ensure the accuracy of running safety assessment of trains during an earthquake, it is recommended to adopt the normal compression algorithm based on normal penetration and consider the multi-point contact in wheel-rail contact modelling.https://www.mdpi.com/2076-3417/13/9/5230running safety assessmentearthquakewheel-rail contactcontact pointnormal compression amountnormal contact stiffness |
| spellingShingle | Guanmian Cai Zhihui Zhu Wei Gong Gaoyang Zhou Lizhong Jiang Bailong Ye Influence of Wheel-Rail Contact Algorithms on Running Safety Assessment of Trains under Earthquakes Applied Sciences running safety assessment earthquake wheel-rail contact contact point normal compression amount normal contact stiffness |
| title | Influence of Wheel-Rail Contact Algorithms on Running Safety Assessment of Trains under Earthquakes |
| title_full | Influence of Wheel-Rail Contact Algorithms on Running Safety Assessment of Trains under Earthquakes |
| title_fullStr | Influence of Wheel-Rail Contact Algorithms on Running Safety Assessment of Trains under Earthquakes |
| title_full_unstemmed | Influence of Wheel-Rail Contact Algorithms on Running Safety Assessment of Trains under Earthquakes |
| title_short | Influence of Wheel-Rail Contact Algorithms on Running Safety Assessment of Trains under Earthquakes |
| title_sort | influence of wheel rail contact algorithms on running safety assessment of trains under earthquakes |
| topic | running safety assessment earthquake wheel-rail contact contact point normal compression amount normal contact stiffness |
| url | https://www.mdpi.com/2076-3417/13/9/5230 |
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