| CUI Xiaolu,LI Jingchen,YINYue,QI Wei,XUJia.Comparative Study on Rail Corrugationat Different Fasteners in Small-radius Curve Sections of Metros[J],53(19):40-49 |
| Comparative Study on Rail Corrugationat Different Fasteners in Small-radius Curve Sections of Metros |
| Received:October 06, 2023 Revised:December 13, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.19.004 |
| KeyWord:rail corrugation vibration characteristics wear characteristics Cologne-egg fastener DTVI2 fastener |
| Author | Institution |
| CUI Xiaolu |
School of Mechanotronics& Vehicle Engineering, Chongqing Jiaotong University, Chongqing , China;Chongqing Rail Transit Group Co., Ltd., Chongqing , China |
| LI Jingchen |
School of Mechanotronics& Vehicle Engineering, Chongqing Jiaotong University, Chongqing , China |
| YINYue |
School of Mechanotronics& Vehicle Engineering, Chongqing Jiaotong University, Chongqing , China |
| QI Wei |
Chongqing Rail Transit Group Co., Ltd., Chongqing , China |
| XUJia |
School of Mechanotronics& Vehicle Engineering, Chongqing Jiaotong University, Chongqing , China |
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| Abstract: |
| Aiming at the issue of different rail corrugation wear between the Cologne-egg fastener section and the DTVI2 fastener section of Chongqing Metro Line 1 under the same line conditions, the rail corrugation wear of two different fasteners was comparatively studied. Firstly, track tests were conducted on rail corrugation with one span distance at fixed positions of the above fastener structure sections. By comparing measured values of rail corrugation in these two different fastener sections, it could be found that the measured values of rail corrugation in the Cologne-egg fastener section changed from 0.04 mm to 0.17 mm, while in the DTVI2 fastener section, the measured values of rail corrugation changed from 0.03 mm to 0.07 mm. Then, based on the field survey data, a finite element model of the wheel-rail-fastener system in the corresponding section was established. Besides, and based on the theory of frictional self-excited vibration, the vibration characteristics of the wheel-rail system in two different fastener sections were comparative analyzed. The wear characteristics of two different fastener section wheel-rail systems were comparatively analyzed based on the theory of friction work.Finally,assuming that the wear on the surface of the rail remained constant each time the wheel passed, the paper predicted the depth change of rail corrugation after one month in two types of fastener sections, and compared the field survey data and simulation prediction data. The wear correction coefficient for rail corrugation was proposed based on the development of rail corrugation.Simulation results showed that the main frequency of frictional self-excited vibration of the wheel-railsystem in the Cologne egg section was 486 Hz, and the main frequency of frictional self-excited vibration of the wheel-rail system in the DTVI2 fastener section was 496 Hz. In addition, the average surface wear of the rail in the two types of fastener sections was 0.000 75 mm and 0.000 37 mmafter one passage of the wheel. In the case of irregularity surface of the rail, the increase rates of rail corrugation wear in the two types of fastener sections were 33.3% and 18.9%.The conclusion indicates that the frictional self-excited vibration of the wheel-rail system in small radius curve sections is the cause of inducing rail corrugation, and the friction work generated by the relative sliding between the wheel and rail will further lead to rail wear. The difference in vibration response of wheel-rail systems under different fastener sections is the fundamental reason for the difference wear of rail. In addition, the irregularity of the rail surface in the two types of fastener sections of the small radius curve section will exacerbate the frictional self-excited vibration of the wheel-rail system.At the same time, the increaseof friction work between the wheel and rail will leads to increaseof rail wear,further leading to different development of rail corrugation in two types of fastener sections. Finally, the wear correction coefficient of the Cologne-egg fastener section is 1.10, and wear correction coefficient of DTVI2 fastener section is 1.19, providing a reference for the operation and maintenance cycle of field rail corrugation. |
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