An investigation into the influence of wheel–rail contact relationships on the carbody hunting stability of an electric locomotive

Li, Wei; Guan, Qinghua; Chi, Maoru; Wen, Zefeng; Sun, Jianfeng

doi:10.1177/09544097221084412

Cited by 17 publications

(8 citation statements)

References 20 publications

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“…It was found that there are similar mechanisms of hunting instability and complex types of hunting motion and bifurcation forms in curved tracks. In addition, some studies have found that the primary hunting motion of vehicle systems at low speeds occurs during the speed-up of the vehicle system, which seriously affects passenger comfort [29][30][31]. Based on the above analysis, there are complex periodic motion pa erns as well as bifurcation types in the speed range above the critical speed.…”

Section: Introductionmentioning

confidence: 97%

The Two-Parameter Bifurcation and Evolution of Hunting Motion for a Bogie System

Wang,

Ma,

Zhang

2024

Applied Sciences

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The complex service environment of railway vehicles leads to changes in the wheel–rail adhesion coefficient, and the decrease in critical speed may lead to hunting instability. This paper aims to reveal the diversity of periodic hunting motion patterns and the internal correlation relationship with wheel–rail impact velocities after the hunting instability of a bogie system. A nonlinear, non-smooth lateral dynamic model of a bogie system with 7 degrees of freedom is constructed. The wheel–rail contact relations and the piecewise smooth flange forces are the main nonlinear, non-smooth factors in the system. Based on Poincaré mapping and the two-parameter co-simulation theory, hunting motion modes and existence regions are obtained in the parameter plane consisting of running speed v and the wheel–rail adhesion coefficient μ. Three-dimensional cloud maps of the maximum lateral wheel–rail impact velocity are obtained, and the correlation with the hunting motion pattern is analyzed. The coexistence of periodic hunting motions is further revealed based on combined bifurcation diagrams and multi-initial value phase diagrams. The results show that grazing bifurcation causes the number of wheel–rail impacts to increase at a low-speed range. Periodic hunting motion with period number n = 1 has smaller lateral wheel–rail impact velocities, whereas chaotic motion induces more severe wheel–rail impacts. Subharmonic periodic hunting motion windows within the speed range of chaotic motion, pitchfork bifurcation, and jump bifurcation are the primary forms that induce the coexistence of periodic motion.

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Section: Introductionmentioning

confidence: 97%

The Two-Parameter Bifurcation and Evolution of Hunting Motion for a Bogie System

Wang,

Ma,

Zhang

2024

Applied Sciences

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“…11,12 Kulkarni et al 13 examine the effect of track maintenance on vehicle dynamics as supported by the nonlinearity parameter and the equivalent conicity at 3 mm on Swedish Railway. Li et al 14 studied the effect of track parameters on wheel-rail contact and carbody hunting stability. Liu et al 15 evaluated the impact of individual wheel profiles on vehicle dynamics and argued that a comprehensive dynamics evaluation in service should account for the distinctiveness of each wheel profile.…”

Section: Introductionmentioning

confidence: 99%

Investigating the effect of rail profile deviation on hunting instability of high-speed railway vehicle under multi-parameter coupling

Hou

Yang

Chen

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part F:

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Small changes to wheel-rail profiles can have a significant impact on the equivalent conicity and vehicle dynamics. Previous research has focused mostly on worn wheels, however, with little attention to different types of rail profile deviation and their influences on vehicle dynamics. Therefore, the specific objective of this paper is to investigate the individual and combined influences of various rail profiles and multi-parameter couplings on the hunting instability of railway vehicles. This paper first obtains the distribution law of rail profile deviation from a statistical analysis of several rail profiles with long-term measurements. Then, the equivalent conicity of rail profiles that match the studied wheel profiles, gauges and wheelback distances is compared. The dynamic model for the vehicle has been established. Finally, the measured rail profiles and wheel profiles, as well as the combinations of the gauges, wheelback distances, friction coefficients and key suspension characteristics are integrated into the simulation model to analyze the atypical phenomenon of the carbody hunting and the bogie hunting. According to the findings, rail profile deviation has a significant impact on equivalent conicity and the evaluation of vehicle stability when subjected to multi-parameter coupling, particularly for worn wheels. Therefore, strict limits of rail profile deviation have to be considered in track maintenance for vehicles running at speeds of 300 km/h or higher.

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“…This motion is characterized by a vibration frequency range of 7-9 Hz, which can be easily coupled with the first-order diamond vibration mode of the car body, thereby resulting in elastic vibration that significantly reduces passenger comfort. The second type is car body hunting, [22][23][24][25] which is occurs in case of an excessively small equivalent conicity. This motion is typically characterized by a vibration frequency range of 1-2 Hz, which can be easily coupled with the rigid body mode of the car body, thereby resulting in significant vibration and reduced passenger comfort.…”

Section: Introductionmentioning

confidence: 99%

Hunting motion of high-speed emu during cross-line operation: Mechanism and countermeasures

Yang,

Wei,

Gan

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part F:

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During the operation of the Chinese 250 km/h-level EMU, hunting occurs when the EMU crosses from Line B to Line A. Numerous tests and simulations have been conducted to investigate the mechanism of this phenomenon. Comparisons of the measured rail profiles of the two lines indicate that the left rail in Line A is higher than that in Line B at the inner rail shoulder. In addition, the top position of the right rail in Line A is approximately 2–3 mm closer to the inside than that of the right rail in Line B, with the right rail in Line A being higher than that in Line B at the inner rail shoulder. These differences cause a significant increase in the wheel–rail equivalent conicity when the EMU crosses from Line B to Line A and further cause the hunting phenomenon. Moreover, simulations and experiments are conducted to investigate the countermeasures for EMU cross-line hunting. Field test results show that both increasing the damping of the yaw damper and wheel reprofiling can improve the stability during EMU cross-line operation; however, the effect of increasing the damping of the yaw damper is limited under particularly poor wheel–rail relationship. Simulation results reveal that rail grinding of Line A referring to the Chinese 60N rail profile can also improve the stability of the EMU during cross-line operation.

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An investigation into the influence of wheel–rail contact relationships on the carbody hunting stability of an electric locomotive

Cited by 17 publications

References 20 publications

The Two-Parameter Bifurcation and Evolution of Hunting Motion for a Bogie System

The Two-Parameter Bifurcation and Evolution of Hunting Motion for a Bogie System

Investigating the effect of rail profile deviation on hunting instability of high-speed railway vehicle under multi-parameter coupling

Hunting motion of high-speed emu during cross-line operation: Mechanism and countermeasures

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