Impact Loads due to Wheel Flats and Shells

Dukkipati, Rao V.; Dong, Ren G.

doi:10.1076/vesd.31.1.1.2097

Cited by 97 publications

(63 citation statements)

References 2 publications

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“…The latter will thus be preferred by engineers in the industry if such analysis is required. There has been some research on the effects of local defects [23,24], but these papers do not concern bridges specifically. Thus, the effect of this type of irregularity on bridge structure is not yet known.…”

Section: Deterministic Track Irregularity Processmentioning

confidence: 98%

A structural articulation method for assessing railway bridges subject to dynamic impact loading from track irregularities

Lilley

Franklin

2010

Vehicle System Dynamics

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This paper discusses the importance of track irregularities in railway bridge design, and presents a new technique for calculating the dynamic impact load induced by such irregularities: the structural articulation method. The properties of the combined bridge-suspension system are coupled through global mass, stiffness, and damping matrices. Under the proposed method, the true suspension system over a particular point on the bridge girder at time t is divided into equivalent suspension systems attributed to adjacent finite-element nodes of the bridge. The time-dependent effects of a moving mass are thereby included in the equation of motion.

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Section: Deterministic Track Irregularity Processmentioning

confidence: 98%

A structural articulation method for assessing railway bridges subject to dynamic impact loading from track irregularities

Lilley

Franklin

2010

Vehicle System Dynamics

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“…Finite element (FE) [1,2,4,5] and generalised mode methods [6] are commonly used to analyse vehicle-track dynamic interactions. The generalised mode method, however, cannot be used for analysis of the wheel-rail dynamic problem based on the Timoshenko beam theory [6], since this theory involves two independent parameters, namely, transverse deflection (z) and rotational angle of the beam cross-section from its original position.…”

Section: Introductionmentioning

confidence: 99%

“…This angle (θ) includes the shear deformation and the slope of the bent beam axis (dz/dx) and is independent of the transverse deflection [7]. Although the FE method is very versatile and widely used in the modelling and simulation of railway track interactions [5,8], it imposes considerable complexities when adjustments or variations in number of elements within one sleeper span Downloaded by [University of Memphis Libraries] at 13:22 20 November 2014 are needed. In order to overcome these limitations, a methodology based on the central finite difference method (CFDM) is developed for analysis of the vehicle-track system in this investigation.…”

Section: Introductionmentioning

confidence: 99%

Development of a vehicle–track model assembly and numerical method for simulation of wheel–rail dynamic interaction due to unsupported sleepers

Zhu

Ahmed

Rakheja

et al. 2010

Vehicle System Dynamics

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2010)Development of a vehicle-track model assembly and numerical method for simulation of wheel-rail dynamic interaction due to unsupported sleepers, Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility, 48:12, 1535-1552 To link to this article: http://dx.In practice, it is not very uncommon to find railway track systems with unsupported sleepers due to the uneven settlement of a ballasted track system. These unsupported sleepers are among the major vibration excitations for a train and track system when a train moves forwards on a track. The vibration induced by unsupported sleepers can cause a large dynamic contact force between wheels and rails. For heavily loaded high-speed trains, the deteriorated sleeper support may lead to accelerated degradation of the railway track and vehicle components, and may thus impose safety risk to the operation. This paper presents analyses of a coupled vehicle-track assembly consisting of a roll plane vehicle model, a continuous track system model and an adaptive wheel-rail contact model. In order to improve the simulation efficiency, a numerical approach based on the central finite difference method is proposed in this investigation. The developed model assembly and proposed simulation method are utilised to simulate the vehicle-track dynamic interaction in the presence of unsupported sleepers. The dynamic response in terms of the dynamic wheel-rail interaction force due to one or multiple unsupported sleepers is studied. Important factors influencing the dynamic wheel-rail interaction force in the presence of sleeper voids are also investigated. The results show that the vehicle speed, the gap size and the number of unsupported sleepers primarily dictate the magnitude of impact load which can be significant.

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“…Any catastrophic fault or failure of 47 railway wheels in service may cause great financial loss and per-48 sonal injury [1,2]. Railway wheels may be subjected to the dynamic 49 loading at different strain rates in service, which are generated 50 mainly by the wheel-rail impact, especially for those wheels with 51 the presence of various out-of-roundness such as the flat, tread 52 defect and polygonization [3][4][5]. It is well-known that the mechan-53 ical properties of engineering materials under dynamic loading are 54 different significantly from those under the quasi-static case.…”

mentioning

confidence: 99%

The dynamic compressive behavior and constitutive modeling of D1 railway wheel steel over a wide range of strain rates and temperatures

Jing

Zhao

2017

Results in Physics

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Impact Loads due to Wheel Flats and Shells

Cited by 97 publications

References 2 publications

A structural articulation method for assessing railway bridges subject to dynamic impact loading from track irregularities

A structural articulation method for assessing railway bridges subject to dynamic impact loading from track irregularities

Development of a vehicle–track model assembly and numerical method for simulation of wheel–rail dynamic interaction due to unsupported sleepers

The dynamic compressive behavior and constitutive modeling of D1 railway wheel steel over a wide range of strain rates and temperatures

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