Dynamic vehicle–track interaction and plastic deformation of rail at rail welds

Wen, Zefeng; Xiao, Guangwen; Xiao, Xinbiao; Jin, Xuesong; Zhu, Minhao

doi:10.1016/j.engfailanal.2008.08.001

Cited by 67 publications

(37 citation statements)

References 23 publications

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“…Today, the most common rail welding processes are flashbutt welding, thermite welding, gas pressure welding and enclosed arc welding [5], and many papers have been published on the issues of rail welds. According to a review of recently published papers on the effect of out-of-round wheel on track and vehicle components [6], the welds are the weakest points in the continuous rail [7].…”

Section: Introductionmentioning

confidence: 99%

Track dynamic behavior at rail welds at high speed

Xiao

Guo

et al. 2010

Acta Mech Sin

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As a vehicle passing through a track with different weld irregularities, the dynamic performance of track components is investigated in detail by using a coupled vehicle-track model. In the model, the vehicle is modeled as a multi-body system with 35 degrees of freedom, and a Timoshenko beam is used to model the rails which are discretely supported by sleepers. In the track model, the sleepers are modeled as rigid bodies accounting for their vertical, lateral and rolling motions and assumed to move backward at a constant speed to simulate the vehicle running along the track at the same speed. In the study of the coupled vehicle and track dynamics, the Hertizian contact theory and the theory proposed by Shen-Hedrick-Elkins are, respectively, used to calculate normal and creep forces between the wheel and the rails. In the calculation of the normal forces, the coefficient of the normal contact stiffness is determined by transient contact condition of the wheel and rail surface. In the calculation of the creepages, the lateral, roll-over motions of the rail and the fact that the relative velocity between the wheel and rail in their common normal direction is equal to zero are simultaneously taken into account. The motion equations of the vehicle and track are solved by means of an explicit integration method, in which the rail weld irregularities are modeled as local track vertical deviations described by some ideal cosine functions. The effects of the train speed, the axle load, the wavelength and depth of the irregularities, and the weld center position in a sleeper span on the wheel-rail This project was supported by the National

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Section: Introductionmentioning

confidence: 99%

Track dynamic behavior at rail welds at high speed

Xiao

Guo

et al. 2010

Acta Mech Sin

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“…Several welding geometry defects have been published as, for example, in [1,[29][30][31]. In the present work the first welding geometry defect shown by Steenbergen in [31] has been chosen.…”

Section: Application Of the Methods For Modelling Forces And Displacemmentioning

confidence: 99%

A rational fraction polynomials model to study vertical dynamic wheel–rail interaction

Correa

Vadillo

Santamaría

et al. 2012

Journal of Sound and Vibration

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Please cite this paper as: Correa, N., Vadillo, E.G., Santamaria, J., Gomez, J. A rational fraction polynomials model to study vertical dynamic wheel-rail interaction. Journal of Sound and Vibration, Vol. 331, pp. 1844-1858. 2012 Corresponding author. Email: ernesto.garciavadillo@ehu.es Sound and Vibration, Vol. 331, pp. 1844-1858. 2012 NOTICE: This is an electronic version of an article published in Journal of SummaryThis paper presents a model designed to study vertical interactions between wheel and rail when the wheel moves over a rail welding. The model focuses on the spatial domain, and is drawn up in a simple fashion from track receptances. The paper obtains the receptances from a full track model in the frequency domain already developed by the authors, which includes deformation of the rail section and propagation of bending, elongation and torsional waves along an infinite track. Transformation between domains was secured by applying a modified rational fraction polynomials method. This obtains a track model with very few degrees of freedom, and thus with minimum time consumption for integration, with a good match to the original model over a sufficiently broad range of frequencies. Wheel-rail interaction is modelled on a non-linear Hertzian spring, and consideration is given to parametric excitation caused by the wheel moving over a sleeper, since this is a moving wheel model and not a moving irregularity model. The model is used to study the dynamic loads and displacements emerging at the wheel-rail contact passing over a welding defect at different speeds.

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“…However, upon considering the vibration mode, the wheel/rail contact geometry relationship becomes complex and difficult to solve because of the bending and torsion of the wheel/rail systems. In recent years, a new method-the explicit finite element (FE) method-has been used to solve problems of high-frequency wheel/rail rolling contact [6,15,[19][20][21][22][23]. This method abandons three basic assumptions including infinite half space, steady rolling, and linear elastic materials of the classic contact algorithms such as Kalker's CONTACT [22].…”

Section: Observation Of Time-frequency Vibration Of the Measured Axlementioning

confidence: 99%

“…They found that a short-wave irregularity with a wavelength range from 0.05 to 0.39 m was the main form. Initiation and development of such an irregularity can be from high-frequency excitation, which finally loses its energy by dissipation in the form of plastic deformation and other processes related to the growth of track damage, as reported by Wen [6], Correa [7], and Mandal and Dhanasekar [8]. Therefore, controlling the size of the short-wave irregularity of welds is of great importance to ensure secure, stable, and economic operation of high-speed railways.…”

Section: Introductionmentioning

confidence: 99%

Observation and Simulation of Axle Box Acceleration in the Presence of Rail Weld in High-Speed Railway

Wang

et al. 2017

Applied Sciences

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Rail welds are widely used in high-speed railways and short-wave irregularities usually appear due to limitations in welding technology. These irregularities can excite a high wheel/rail force and are regarded as the main cause of deterioration in track structures. To measure this fierce force (or deterioration of the rail weld), axle box acceleration is treated as an effective and economic measure, though an exact quantitative relation between these two quantities remains elusive. This paper aims to develop such a relation in order to provide a new theoretical basis and an analysis method for monitoring and controlling weld geometry irregularity. To better understand the characteristics of axle box acceleration, the paper consists of two parts: an observation and a numerical simulation of axle box acceleration by rail welds. Based on measured data from field tests, axle box acceleration at rail welds was found to have high-frequency vibrations in two frequency bands (i.e., 350-500 Hz and 1000-1200 Hz). Upon analyzing the vibration characteristics in time-frequency domains, the exact location of the rail weld irregularity could be identified. Subsequently, a 3D high-speed wheel/rail rolling contact finite element model was employed to investigate the effect of rail weld geometry on axle box acceleration, and led to the discovery that the weld length and depth determine the vibration frequency and amplitude of the axle box acceleration, respectively. A quantitative relation between axle box acceleration and wheel/rail force has also been determined. Finally, we propose an approach for real-time health detection of rail welds and discuss the influence of other defects and rail welds on the acceleration signal of the axle box.

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Dynamic vehicle–track interaction and plastic deformation of rail at rail welds

Cited by 67 publications

References 23 publications

Track dynamic behavior at rail welds at high speed

Track dynamic behavior at rail welds at high speed

A rational fraction polynomials model to study vertical dynamic wheel–rail interaction

Observation and Simulation of Axle Box Acceleration in the Presence of Rail Weld in High-Speed Railway

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