Influence of wheel flat of EMUs on vehicle-track dynamic characteristics at sections in permafrost region

WU Dan; WANYAN Bo; YAO Yun; LONG Ye; LI Xian-feng

doi:10.19818/j.cnki.1671-1637.2026.064

Volume 26 Issue 7

Jul. 2026

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Article Navigation > Journal of Traffic and Transportation Engineering > 2026 > 26(7): 134-144

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WU Dan, WANYAN Bo, YAO Yun, LONG Ye, LI Xian-feng. Influence of wheel flat of EMUs on vehicle-track dynamic characteristics at sections in permafrost region[J]. Journal of Traffic and Transportation Engineering, 2026, 26(7): 134-144. doi: 10.19818/j.cnki.1671-1637.2026.064

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WU Dan, WANYAN Bo, YAO Yun, LONG Ye, LI Xian-feng. Influence of wheel flat of EMUs on vehicle-track dynamic characteristics at sections in permafrost region[J]. Journal of Traffic and Transportation Engineering, 2026, 26(7): 134-144. doi: 10.19818/j.cnki.1671-1637.2026.064

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Influence of wheel flat of EMUs on vehicle-track dynamic characteristics at sections in permafrost region

doi: 10.19818/j.cnki.1671-1637.2026.064

WU Dan^{1
,
,},
WANYAN Bo¹,
YAO Yun¹,
LONG Ye¹,
LI Xian-feng²

1.
School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
2.
School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China

More Information

Corresponding author: WU Dan, associate professor, PhD, E-mail: wudan@mail.lzjtu.cn
Received Date: 2025-05-20
Accepted Date: 2025-09-26
Rev Recd Date: 2025-07-30
Publish Date: 2026-07-28

Abstract

Abstract

To study the wheel-rail vibration response characteristics of EMUs under the combined action of sections in a permafrost region and wheel flat, a rigid-flexible coupling vehicle-track dynamic model considering flexible wheelsets and rails was established based on multi-body dynamics theory and finite element method. With the wheel flat and uneven frost heave of sections in the permafrost region as the wheel-rail excitation, the influence law of the joint action of the two on the dynamic performance of the vehicle and the safety threshold of each parameter were studied. The research results show that both wheel flat and frost heave deformation increase the wheel-rail vertical force to varying degrees. When the vehicle running speed is 300 km·h^-1 and the wheel flat length is greater than 30 mm, a brief separation phenomenon occurs between the wheel and rail. Through a comparative analysis of 9 kinds of composite irregularity conditions formed by the combination of wheel flat length (10, 20, and 30 mm) and uneven frost heave deformation amplitude (10, 20, and 30 mm), it is found that the longitudinal creep force is mainly influenced by the wheel flat length, while the lateral creep force is influenced by both the wheel flat length and the frost heave amplitude. In terms of vibration response, the vertical acceleration of the frame is influenced by both the irregularity combination and the vehicle running speed. The vertical acceleration transmitted to the vehicle body is attenuated by the suspension system, and its response level is mainly positively correlated with the vehicle running speed. In terms of operation safety, the rate of wheel load reduction and wheel-rail vertical force are mainly influenced by the wheel flat length. Combined with the vehicle performance safety index, it is recommended that the wheel flat limit be controlled within 30 mm when passing through sections in the permafrost region. The research results can provide some theoretical reference value for the operation and maintenance of high-speed trains.
- high-speed train,
- wheel flat,
- vehicle-track coupled dynamics,
- vibration characteristic,
- safety threshold,
- permafrost region

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References

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Influence of wheel flat of EMUs on vehicle-track dynamic characteristics at sections in permafrost region

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