Sensitivity Analysis for Influence Parameters of Rail Corrugation Characteristics in Metro Straight Section

Wang, Zhiqiang; Lei, Zhenyu

doi:10.12913/22998624/142034

Cited by 1 publication

(4 citation statements)

References 19 publications

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“…For both straight and curved track, the most unfavourable situation occurs when the value of the aforementioned track stiffness is close to 1E6 N/m. The results of the calculations, concerning the numerical values of the natural frequencies of the wheelset -track system, are in accordance with those presented in [2] or [5] and confirm the direct influence on the possibility of corrugation formation. However, it should be noted that, contrary to the assumptions of the article presented here, the test scenarios described in [2], [5] and [6] were based on the assumption that the rails are undulating and that existing corrugations are the source of kinematic forcing from the track.…”

Section: Discussionsupporting

confidence: 84%

“…The results of the calculations, concerning the numerical values of the natural frequencies of the wheelset -track system, are in accordance with those presented in [2] or [5] and confirm the direct influence on the possibility of corrugation formation. However, it should be noted that, contrary to the assumptions of the article presented here, the test scenarios described in [2], [5] and [6] were based on the assumption that the rails are undulating and that existing corrugations are the source of kinematic forcing from the track. While appreciating that a mathematical model of the vehicle incorporating the transfer of traction power from the electric motors to the axle of the wheelset via a gearbox was used in [6] to investigate the non-linear dynamic responses of the heavy locomotive, we note that the type of system considered is not typical of high-speed vehicles.…”

Section: Discussionsupporting

confidence: 84%

“…In Poland, corrugations with wavelengths of 25 to 80 mm ('short' waves) and amplitudes of the order of hundredths of a millimetre are predominant [1]. It has been shown in the literature [2] that the occurrence of rail corrugation is closely related to the self-excited vibrations of the wheel-rail system, and that the characteristic frequency of these vibrations is close to the characteristic frequency of the vibrations generated by the parameters of the already existing rail corrugation. In this literature the stochastic finite element method was used, investigating the sensitivity of prameters such as the elastic modulus and material density of the rail, the stiffness and damping of the track and the longitudinal creepage in the wheel-rail system as random parameters.…”

Section: Introductionmentioning

confidence: 99%

“…In this literature the stochastic finite element method was used, investigating the sensitivity of prameters such as the elastic modulus and material density of the rail, the stiffness and damping of the track and the longitudinal creepage in the wheel-rail system as random parameters. According to [2] the following elements are necessary for the initiation and development of the corrugation process: the dynamic interaction between wheels and rails in the contact areas, the cyclicity of the vertical and longitudinal loads exerted by the wheels on the rails, and the large longitudinal slips in the wheel-rail contact areas. Most of the available literature is concerned with studies of the mechanism of corrugation wavelength determination as a result of interaction between a wheel and a rail with a rough surface.…”

Section: Introductionmentioning

confidence: 99%

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Impact of an Electric Locomotive on a Perfectly Smooth Railway Track in Terms of Rail Corrugation Formation

Matej,

Orliński

2023

Adv. Sci. Technol. Res. J.

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Purpose of the article is to demonstrate that a high-speed electric locomotive, driven by asynchronous motors in a hollow shaft arrangement and swing-out couplings, can generate corrugation conditions on the surface of new and smooth rails on straight and curved track. Most studies carried out in this area is usually concerned with the response of the power train to kinematic excitation from a track where corrugations are already present. The novelty of the look presented in the article is to establish the influence of the vehicle's driveline and the parameters of a perfectly smooth formation track on the mechanism of corrugation. A four-axle EU11 electric locomotive, produced in Poland in the late 1990s, has been selected for analysis. A complete electro-mechanical model of the locomotive was built using the Vi-Rail software and prepared for simulation on straight and curved track. A non-linear model of wheel-rail contact was included and the contact forces were determined for the locomotive model in motion with the active power system. Unbalanced inertia forces generated by the scattering of stiffness characteristics of the coupling links, have been included to the propulsion system as an additional source of dynamic excitations. The complexity of the obtained results was influenced by the fact that simulation studies were carried out in both the time and frequency domains. The results obtained in the time domain were used to calculate the vertical and torsional vibration frequencies with respect to the driving wheelsets. One of the most important results of the simulation studies carried out is the determination of the effect of locomotive acceleration on the frequency of resonant torsional vibrations of the wheelsets in straight and curved track traffic.

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