On kinematic and self-excited rail vehicle–track interaction

Bogacz, R.; Kurnik, W.

doi:10.1007/s00419-017-1298-x

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…Therefore, the main cause of rail corrugation is the coupling effect of wheel discs bending vibration and inner rail bending-torsional vibration under the condition of wheel-rail system with stick-slip negative slope. There are some related researches in [28][29][30], such as the self-excited vibration of wheel-rail system and the corresponding bending and torsional vibration modes, however, compared with those, this paper further analyzes the contact creep characteristics of inside and outside wheel-rail systems of leading and trailing wheelsets in detail. Meanwhile, combined with the modal analysis, the formation mechanism of rail corrugation is comprehensively explained in the presented paper.…”

Section: Modal Characteristics Of Wheelset-track Systemmentioning

confidence: 99%

Cause Analysis of Rail Corrugation Based on Stick-slip Characteristics

Wang

Lei²

2023

Period. Polytech. Mech. Eng.

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By analyzing the measured corrugation data, the cause of rail corrugation was discussed theoretically. Then, the vehicle-track coupling model was used to study the stick-slip characteristics of wheel-rail system. Finally, the cause of rail corrugation was explained by combining modal analysis and wheel-rail stick-slip relation. The transverse stick-slip curve on the inner rail-inner wheel of the leading wheelset presents a negative slope characteristic, which makes the inner wheel easy to slide on the inner rail surface and aggravates the wear of inner rail; there are also negative slope sections of the stick-slip curve on the outer rail-outer wheel of the trailing wheelset, but the adhesion coefficient is relatively large, indicating that the outer wheel will not slide obviously and the wear is relatively small. Meantime, with the increase of line curve radius, the negative slope phenomenon of stick-slip curves on the inner and outer rail sides shows a decreasing trend, which illustrates that the sliding wear of wheel is gradually reduced, and thus the occurrence probability of rail corrugation decreases. Combined with modal analysis, it can be seen that the coupling action of wheel discs bending vibration and inner rail bending-torsional vibration is the main cause of rail corrugation under the condition of wheel-rail system with stick-slip negative slope.

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Section: Modal Characteristics Of Wheelset-track Systemmentioning

confidence: 99%

Cause Analysis of Rail Corrugation Based on Stick-slip Characteristics

Wang

Lei²

2023

Period. Polytech. Mech. Eng.

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“…The problem of a moving oscillator on a flexible beam has been extensively studied in the literature [8,9], which is one cause of instability in railway vehicles [10]. In a roller coaster, however, the varying dynamical loads and speed caused by travelling along a spatial trajectory may not be neglected.…”

Section: Flexible Vehicle-track Interactionmentioning

confidence: 99%

“…where the evolution equations for the lateral and vertical deflections 𝐰 𝑦 and 𝐰 𝑧 the cars are given in Equation (10) and Equation (16).…”

Section: Mechanical Modelmentioning

confidence: 99%

Self‐excitability of roller coaster trains along spatial trajectories

Agustí,

Kecskeméthy

2023

Proc Appl Math and Mech

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It is well known that vibrations usually appear during a roller coaster ride, which in some cases leads to passenger discomfort and poses additional material and structural strain. However, the causes of such vibrations are still not fully understood or have not been rigorously tackled in the literature, mainly due to the lack of experiments and real data. While there have been technological advances that help to mitigate them to some degree, for instance by placing shock absorbers between the wheels and the bogie frame, an analysis of this phenomenon is required to make better decisions at the design stage. Here, two possible self‐excitation scenarios are analysed: a bogie instability in curved track sections and a train–track interaction from the point of view of a set of moving oscillators on a flexible spatial trajectory. In the first model, Hopf bifurcations are observed for a combination of reasonable parameters. In the second model, the numerical results also show increased vibrations for some train configurations, which potentially indicates that the track flexibility may not be overlooked. While this research proposes new causes of vibrations in roller coasters, experiments need to be carried out in order to corroborate the results.

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On kinematic and self-excited rail vehicle–track interaction

Cited by 2 publications

References 7 publications

Cause Analysis of Rail Corrugation Based on Stick-slip Characteristics

Cause Analysis of Rail Corrugation Based on Stick-slip Characteristics

Self‐excitability of roller coaster trains along spatial trajectories

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