Effect of the first two wheelset bending modes on wheel-rail contact behavior
07 Dec 2014-Journal of Zhejiang University Science (Zhejiang University Press)-Vol. 15, Iss: 12, pp 984-1001
TL;DR: In this article, a new wheel-rail contact model was developed for considering the effect of wheel-set bending deformation on wheelrail contact behavior at high speeds, which is suitable for high-speed vehicles.
Abstract: The objective of this paper is to develop a new wheel–rail contact model, which is suitable for considering the effect of wheelset bending deformation on wheel–rail contact behavior at high speeds. Dummies of the two rigid half wheelsets are introduced to describe the spacial positions of the wheels of the deformed wheelset. In modeling the flexible wheelset, the first two wheelset bending modes are considered. Based on the modal synthesis method, these mode values of the wheelset axle are used to solve the motion equations of the flexible wheelset axle modeled as an Euler–Bernoulli beam. The wheel is assumed to be rigid and always perpendicular to the deformed axle at the wheel center. In the vehicle model, two bogies and one car body are modeled as lumped masses. Spring–damper elements are adopted to model the primary and secondary suspension systems. The ballasted track is modeled as a triple-layer discrete elastic supported model. Two high-speed vehicle–track models, one considering rigid wheelset models and the other considering flexible wheelset models, are used to analyze the differences of the numerical results of the two models in both frequency and time domains. In the simulation, a random high-speed railway track irregularity is used as wheel–rail excitations. Wheel–rail forces are calculated and analyzed in the time and frequency domains. The results clarify that this new contact model can characterize very well the influence of the first two bending modes of the wheelset on contact behavior.
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01 Jun 2020
TL;DR: In this article, the authors characterized the peak particle velocities (PPVs) generated in the component strata of a ballasted railway embankment during high-speed train transit within 160 to 200 km/h.
Abstract: The ascending requirement of railway passengers for fast transit to distant stations has led to the development of high-speed railway networks. Faster and longer trains with heavy axle loads are in operation, inducing stronger ground vibrations in the supporting railway infrastructure. The conventional design of railway track structures are based on the maximum displacements safely allowed in the track under the expected railway loads. However, the vibrations generated in the tracks due to railway operations should also be of concern. This study characterizes the peak particle velocities (PPVs) generated in the component strata of a ballasted railway embankment during high-speed train transit within 160 to 200 km/h. The transient response of each strata is characterized for transit of wheel load in the vibration influence zone, and temporal variation of PPVs have been logged for the transit of wheel load through a distance of 30 m on the railway track. The results from the present study indicate that railway track embankments are subject to strong ground motions during high-speed train transit, which will lead to accelerated degradation of the track structure. Ground vibrations are remnant in the railway embankment, even after passage of train wheels to farther distances. Deployment of vibration mitigation measures are recommended in sensitive locations proximate to railway lines. The particle velocities quantified in this study can be utilized by railway design authorities for estimating ground-borne railway vibrations under multiple train wheel configurations, based on the axle spacing, bogie spacing and the depth of the track under consideration.
10 citations
TL;DR: In this paper, a specific coupling of wheel-rail contact with a flexible wheelset is presented and integrated into a conventional vehicle-track dynamic system model to investigate the effects of wheelset bending and axial deformation of the wheel web.
Abstract: The flexibility of a train’s wheelset can have a large effect on vehicle–track dynamic responses in the medium to high frequency range. To investigate the effects of wheelset bending and axial deformation of the wheel web, a specific coupling of wheel–rail contact with a flexible wheelset is presented and integrated into a conventional vehicle–track dynamic system model. Both conventional and the proposed dynamic system models are used to carry out numerical analyses on the effects of wheelset bending and axial deformation of the wheel web on wheel–rail rolling contact behaviors. Excitations with various irregularities and speeds were considered. The irregularities included measured track irregularity and harmonic irregularities with two different wavelengths. The speeds ranged from 200 to 400 km/h. The results show that the proposed model can characterize the effects of flexible wheelset deformation on the wheel–rail rolling contact behavior very well. Wheelset flexibility has a significant effect on vehicle–track dynamic responses in the medium to high frequency range. To investigate the effects of wheelset bending and axial deformation of the wheel web, a specific coupling of wheel–rail contact with a flexible wheelset is presented and integrated into a conventional vehicle–track dynamic system model. Both the conventional and proposed dynamic system models are used to analyze the effect of the wheelset bending and the axial deformation of wheel web on the wheel–rail rolling contact behaviors.
8 citations
01 Sep 2020
TL;DR: In this paper, the authors characterized the spatial variation of train-induced vibrations in the ballasted railway embankments for the high-speed train speeds from 160 to 200 km/h.
Abstract: Transit of high-speed trains in ballasted railway tracks leads to generation and propagation of ground vibrations onto buildings proximate to railway lines through the track embankment and native subsoil. These vibrations amplify through the building structure, causing deformations in the buildings and distress to the residents. The spatial variation of train-induced vibrations in the ballasted railway embankments is characterized for the high-speed train speeds from 160 to 200 km/h. Variation of PPVs in the embankment strata at different speeds, during the transit of train wheels on the track in single and multiple wheel load configurations, are presented. It is ascertained that faster train speeds induce strong ground vibrations in upper embankment strata and slower trains induce large ground vibrations in the strata below track subgrade. The results from the present study also point out that strong vibrations persist in the track embankment, even after a train wheel has traversed a distance of 15 m ahead of a given location in the track. Mitigation of these ground vibrations can avoid potential hazards due to track defects like flying ballasts, hanging sleepers and mud pumping resulting from strong ground motions.
8 citations
01 Nov 2018
TL;DR: This paper thoroughly evaluates the flexible deformation of shaft and bearing, time-varying nonlinear contact load, track irregularity, and bearing to establish a wheel/rail system coupling dynamics model and verified this theoretical model of the wheel–bearing–rail system dynamics.
Abstract: As the main bearing components of vehicle wheel/rail systems, railway bearings take on the main load of wheel/rail system. These bearings can be easily damaged after a long-term load, which causes ...
5 citations
Cites methods from "Effect of the first two wheelset be..."
...As vehicles capable of greater and greater speeds are built, the traditional multi-rigid-body dynamics modeling method cannot fully explain the problems during the operation; scholars considered replacing the corresponding flexible finite element model of bodywork, artifacts, round on the basis of the multibody dynamics model, established a series of rigid– flexible hybrid dynamic model and has carried on the theoretical analysis.(10,11) Luis used finite element software to establish a coupling dynamics model of flexible wheel/rail systems in which the axles were divided into finite elements....
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01 Jan 2004
TL;DR: The results from an extensive wheel measurement campaign performed in Sweden are given and discussed in this paper, where the selected wheels had travelled a distance of more than 100,000 km, and the measurements were conducted when the train wagons/coaches had been taken out of traffic for maintenance, most of them due to reasons other than wheel OOR.
Abstract: Results from an extensive wheel measurement campaign performed in Sweden are given and discussed. Out-of-roundness (OOR), transverse profile and surface hardness of 99 wheels on passenger trains (X2 and intercity), freight trains, commuter trains (Regina) and underground trains (C20) were measured. Both tread and disc braked wheels were investigated. The selected wheels had travelled a distance of more than 100000 km, and the measurements were conducted when the train wagons/coaches had been taken out of traffic for maintenance, most of them due to reasons other than wheel OOR. Mechanical contact measurement methods were used. The highest roughness levels (higher than 20 dB re 1 μm for some wheels) were found on powered high-speed (X2) train wheels. The previously known polygonalization of C20 underground wheels is quantified. It is also verified that an initial irregularity is formed due to the clamping in a three-jaw chuck during profiling of new C20 wheels. Magnitudes and wavelength contents of measured wheel roughness are compared with corresponding measurements of rail roughness.
5 citations
References
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TL;DR: In this paper, a comparison of alternative Creep Force Models for rail vehicle dynamic analysis is presented, and the results show that the alternative models are less accurate than the original models in terms of acceleration and acceleration.
Abstract: (1983). A Comparison of Alternative Creep Force Models for Rail Vehicle Dynamic Analysis. Vehicle System Dynamics: Vol. 12, No. 1-3, pp. 79-83.
459 citations
"Effect of the first two wheelset be..." refers methods in this paper
...The normal wheel-rail contact forces are calculated by the Hertzian nonlinear contact spring model, and the tangent contact forces and spin moments are calculated by means of the model by Shen et al. (1983)....
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Book•
01 Jan 1981
TL;DR: This book discusses filter design techniques, components Selection for LC and Active Filters, and how to select the Response Characteristic.
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245 citations
01 Mar 2000
TL;DR: In this paper, a literature survey discusses the state-of-the-art in research on why out-ofround railway wheels are developed and on the damage they cause to track and vehicle components.
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224 citations