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| Effect of wheel-rail slip on the vibration characteristics of fastener clips in high-speed railways |
| KANG Xi1,2，CHEN Guangxiong2，HE Junhua2，SONG Qifeng2，LU Sheng1 |
| 1.School of Advanced Manufacturing Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China；
2.Tribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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Abstract Aiming at the failure phenomenon of ω type fastener clips in the longitudinal gradient section of high-speed railways, the stability of a finite element model of the wheel-rail-fasteners system was studied via complex feature value method when wheel-rail slip occurs. Comparing the frictional self-excited vibration mode and the fastener clip structural mode, the occurrence of clip resonance phenomenon was analyzed. By recompiling the node coordinates of the rail surface, the real profile of rail corrugation in the high-speed railway was simulated, and the effect of forced vibrations excited by the rail corrugation on the clip resonance was evaluated. The results show that when the high-speed train tows or brakes in the longitudinal gradient section, the wheel-rail longitudinal creep force tends to be saturated, causing the unstable vibration of about 603 Hz. This vibration can not only excite the third-order mode of the fastener clip, but also cause the formation of rail corrugation. When the train runs at 300 km/h, the wheel-rail vibrations excited by the rail corrugation can also cause the clip to resonate. The static stiffness of the rail pad and the fastener preload have less effect on the tendency toward unstable vibration of 603 Hz caused by wheel-rail slip.
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Received: 18 July 2022
Published: 28 September 2023
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