Effects of wheel diameter difference on lateral stability of motor elastic frame suspension bogie

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (11) : 111-118.

VIBRATION THEORY AND INTERDISCIPLINARY RESEARCH

Effects of wheel diameter difference on lateral stability of motor elastic frame suspension bogie

QI Yayun*1, AO Peng1, DAI Huanyun2, LIU Hua1, HE Xing1, LI Liangxu1

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Abstract

Wheel diameter differences can intensify the hunting instability of the bogie, and a motor suspension structure with elasticity can effectively enhance its stability. To elucidate the relationship between wheel diameter differences and the lateral stability of a motor-suspended bogie, a nonlinear wheel-rail contact model and a lateral dynamic model of a motor-suspended bogie is established. These models are used to analyze the effect of wheel diameter differences and motor suspension parameters on the lateral stability of the bogie. Additionally, this paper investigates the Hopf bifurcation characteristics of wheelsets under different wheel-rail contact conditions. The research results showed that under the condition of in-phase wheel diameter difference, the stability of the bogie system first increases and then decreases with the increase of the motor's lateral frequency, with an optimal frequency of approximately 3Hz. When the frequency of the motor matches the hunting frequency of the bogie, and its amplitude is lower than that of the latter, the vibration reduction effect of the motor suspension is better. However, the generation of wheel diameter difference will reduce this effect. When the vehicle speed is too high and the wheel diameter difference exceeds 1.2mm, it will lead to flange contact between the wheel and rail. This can enhance the stability of the bogie in the short term, but it will intensify wheel and rail wear in the long term. The larger the wheel diameter difference, the more the balance centerline of the wheelset deviates from the centerline of the track, making the wheelset system more likely to transition from a subcritical Hopf bifurcation to a supercritical Hopf bifurcation. In-phase operating conditions, the critical value for the wheel diameter difference is 0.5mm, and the critical value for the front wheelset diameter difference is 1.5mm.

Key words

high speed EMUs；bogie stability；wheel diameter difference / motor elastic suspension / Hopf bifurcation

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QI Yayun1, AO Peng1, DAI Huanyun2, LIU Hua1, HE Xing1, LI Liangxu1. Effects of wheel diameter difference on lateral stability of motor elastic frame suspension bogie[J]. Journal of Vibration and Shock, 2025, 44(11): 111-118

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