Spectrum analysis of hunting motion of flexible bogies in high-speed EMUs

GAN Feng; DAI Huan-yun; LUO Guang-bing; YANG Zhen-huan; LI Tao

doi:10.19818/j.cnki.1671-1637.2022.01.013

Volume 22 Issue 1

Feb. 2022

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Article Navigation > Journal of Traffic and Transportation Engineering > 2022 > 22(1): 155-167

GAN Feng, DAI Huan-yun, LUO Guang-bing, YANG Zhen-huan, LI Tao. Spectrum analysis of hunting motion of flexible bogies in high-speed EMUs[J]. Journal of Traffic and Transportation Engineering, 2022, 22(1): 155-167. doi: 10.19818/j.cnki.1671-1637.2022.01.013

Citation:

GAN Feng, DAI Huan-yun, LUO Guang-bing, YANG Zhen-huan, LI Tao. Spectrum analysis of hunting motion of flexible bogies in high-speed EMUs[J]. Journal of Traffic and Transportation Engineering, 2022, 22(1): 155-167. doi: 10.19818/j.cnki.1671-1637.2022.01.013

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Spectrum analysis of hunting motion of flexible bogies in high-speed EMUs

doi: 10.19818/j.cnki.1671-1637.2022.01.013

State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

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National Natural Science Foundation of China 51975485

Independent Subject of State Key Laboratory of Traction Power 2019TPL_20

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Author Bio:
GAN Feng(1986-), male, assistant research fellow, PhD, ganfengabc@126.com
Received Date: 2021-08-21
Publish Date: 2022-02-25

Abstract

Abstract

In order to analyze the spectrum of bogie hunting motion of high-speed EMUs at different operating speeds, a free wheelset hunting motion model was deduced, and three first-order differential equations related to the longitudinal velocity, lateral velocity and yaw angular velocity were established. A hunting motion model of the flexible bogie was established, and a 9- degree of freedom hunting motion equation related to the degrees of freedom of lateral displacement and shaking-head of wheelset and frame was given. Combined with the parameters of vehicle suspension and the measured wheel-rail contact relationship, and together with the hunting motion equation of free wheelset, the hunting wavelengths and frequencies of frame under different initial lateral displacements of wheelset were solved. Taking the wheel tread profile measured in one wheel repair cycle of a certain type of EMUs as an example, the variation law of the frame hunting wavelengths and frequencies under different mileages after wheel repair were analyzed. Analysis results show that some measuring points have obvious vibration frequencies of 2.9, 14.9 and 33.6 Hz, and these frequencies increase linearly with the vehicle speed. 33.6 Hz comes from the frequency when the vehicle passes through the CRTS Ⅱ track plate; 14.9 Hz comes from the wheel rotation frequency when running at 350 km·h^-1. When the initial lateral displacement of the wheelset is 3 mm and the equivalent conicity is 0.14, the calculated hunting frequency of the frame is 3.0 Hz, which is close to the measured lateral vibration frequency of the frame of 2.9 Hz. And then the accuracy of the differential equation is verified. With the increase of the mileage after the wheel repair, the equivalent conicity under the same wheelset lateral displacement continues to increase, the hunting wavelength of the frame continues to decrease, and the hunting frequency also increases. After 206 000 km after wheel repair, the maximum hunting frequency is close to 8 Hz when the wheelset lateral displacement is 1 mm. 1 tab, 18 figs, 32 refs.
- vehicle engineering,
- flexible bogie,
- hunting motion,
- hunting frequency,
- equivalent conicity,
- frame stability

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References(32)

References

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Spectrum analysis of hunting motion of flexible bogies in high-speed EMUs

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Spectrum analysis of hunting motion of flexible bogies in high-speed EMUs

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