Influence of wheel-rail excitation on contact characteristics and stress intensity factors of cracked gears for locomotives

ZHU Hai-yan; TAO Ze-yu; WANG Yu-hao; WANG Meng-wei; ZHANG Wei-hua; XIAO Qian; YI Yong

doi:10.19818/j.cnki.1671-1637.2024.04.011

Volume 24 Issue 4

Aug. 2024

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ZHU Hai-yan, TAO Ze-yu, WANG Yu-hao, WANG Meng-wei, ZHANG Wei-hua, XIAO Qian, YI Yong. Influence of wheel-rail excitation on contact characteristics and stress intensity factors of cracked gears for locomotives[J]. Journal of Traffic and Transportation Engineering, 2024, 24(4): 148-160. doi: 10.19818/j.cnki.1671-1637.2024.04.011

Citation:

ZHU Hai-yan, TAO Ze-yu, WANG Yu-hao, WANG Meng-wei, ZHANG Wei-hua, XIAO Qian, YI Yong. Influence of wheel-rail excitation on contact characteristics and stress intensity factors of cracked gears for locomotives[J]. Journal of Traffic and Transportation Engineering, 2024, 24(4): 148-160. doi: 10.19818/j.cnki.1671-1637.2024.04.011

Citation:

ZHU Hai-yan, TAO Ze-yu, WANG Yu-hao, WANG Meng-wei, ZHANG Wei-hua, XIAO Qian, YI Yong. Influence of wheel-rail excitation on contact characteristics and stress intensity factors of cracked gears for locomotives[J]. Journal of Traffic and Transportation Engineering, 2024, 24(4): 148-160. doi: 10.19818/j.cnki.1671-1637.2024.04.011

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Influence of wheel-rail excitation on contact characteristics and stress intensity factors of cracked gears for locomotives

doi: 10.19818/j.cnki.1671-1637.2024.04.011

1.
State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, Jiangxi, China
2.
State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

Funds:

National Natural Science Foundation of China 52162045

Natural Science Foundation of Jiangxi Province 20224BAB204040

Natural Science Foundation of Jiangxi Province 20232ACB204022

Science and Technology Project of Jiangxi Provincial Department of Education GJJ210633

Independent Project of Key Laboratory of Conveyance and Equipment of Ministry of Education KLCEZ2022-11

Open Project of State Key Laboratory of Rail Transit Vehicle System RVL2403

More Information

Author Bio:
ZHU Hai-yan(1975-), male, professor, PhD, zhupetrelcao@163.com
Received Date: 2024-01-23
Available Online: 2024-09-26
Publish Date: 2024-08-28

Abstract

Abstract

The time-varying meshing stiffness of gears with root crack faults was solved by the numerical method, a 6-DOF gear dynamics model was established, and the Newmark method was used to solve the dynamic responses of the gear transmission systems with crack depths of 1, 2, and 3 mm. The time domain signal was analyzed, and the sensitivities of different statistical indexes to different fault degrees were calculated. A multi-body dynamics model of the locomotive was built based on the multi-body dynamics. The contact characteristics of the gear transmission system with tooth root cracks were solved under wheel polygon excitations of 18th, 19th, and 24th orders and rail corrugations of 0.5, 1.0, and 1.5 mm wave depths. The contact states of tooth surfaces under different excitation conditions were simulated. Analysis results indicate that the time-varying meshing stiffness gradually decreases with the increase of crack propagation angle and crack depth. With the deepening of crack depth, the vibration and shock of the transmission system become increasingly severe. The pulse factor is sensitive to the crack fault characteristics and is suitable as an evaluation index of crack fault characteristics. With the increase of wheel polygon order and rail corrugation depth, the maximum contact force of a single tooth surface with cracks is about 3.0 times and 6.4 times that under the no excitation, respectively. When the wheel polygon order is 24, the contact resultant force of the tooth surface and the contact force of the single tooth surface both reach maximum values, which are 4 125 and 1 178 N, respectively. The value of the mode Ⅰ crack stress intensity factor is much larger than that of the mode Ⅱ crack stress intensity factor. Mode Ⅰ crack is dominant in crack propagation, and the stress intensity factor increases with the increase of load and expansion degree, indicating that the existence of wheel-rail excitation can increase the crack propagation rate of cracked teeth, shorten its service life, and affect the safe operation of locomotives.
- vehicle engineering,
- wheel polygon,
- rail corrugation,
- locomotive gear,
- tooth root crack,
- contact characteristic,
- stress intensity factor

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References(32)

References

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