Safety assessment of underground vehicles passing over highly resilient straight track in the presence of a broken rail

González, Fernández; Suarez, Berta; Paulin, J. Saint Jean; Fernández, Ignacio

doi:10.1243/09544097jrrt128

Cited by 14 publications

(12 citation statements)

References 16 publications

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“…However, neglecting track flexibility may result in a significant overestimation of the railway vehicle dynamic performances, including the vehicle critical speed [21], wheelrail contact forces [19], and other involved vehicle system dynamical behaviors [20]. In addition, the classical derailment analysis using a simplified rigid track model can not solve the safety problems caused by the track component failure and other severe conditions, such as train derailment caused by unsupported tracks [24], broken rails [17,18], etc.…”

Section: Track Flexibilitymentioning

confidence: 99%

“…Cheli et al [16] carried out a numericalexperimental investigation to evaluate the running safety of tramcar vehicles due to dynamic effects of track geometrical defects. Suarez et al [17,18] analyzed the running safety of underground vehicles passing over highly resilient straight and curved slab tracks in the presence of a broken rail by using the SIMPACK.…”

Section: Introductionmentioning

confidence: 99%

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Development of a simulation model for dynamic derailment analysis of high-speed trains

2014

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The running safety of high-speed trains has become a major concern of the current railway research with the rapid development of high-speed railways around the world. The basic safety requirement is to prevent the derailment. The root causes of the dynamic derailment of highspeed trains operating in severe environments are not easy to identify using the field tests or laboratory experiments. Numerical simulation using an advanced train-track interaction model is a highly efficient and low-cost approach to investigate the dynamic derailment behavior and mechanism of high-speed trains. This paper presents a three-dimensional dynamic model of a high-speed train coupled with a ballast track for dynamic derailment analysis. The model considers a train composed of multiple vehicles and the nonlinear inter-vehicle connections. The ballast track model consists of rails, fastenings, sleepers, ballasts, and roadbed, which are modeled by Euler beams, nonlinear spring-damper elements, equivalent ballast bodies, and continuous viscoelastic elements, in which the modal superposition method was used to reduce the order of the partial differential equations of Euler beams. The commonly used derailment safety assessment criteria around the world are embedded in the simulation model. The train-track model was then used to investigate the dynamic derailment responses of a high-speed train passing over a buckled track, in which the derailment mechanism and train running posture during the dynamic derailment process were analyzed in detail. The effects of train and track modelling on dynamic derailment analysis were also discussed. The numerical results indicate that the train and track modelling options have a significant effect on the dynamic derailment analysis. The inter-vehicle impacts and the track flexibility and nonlinearity should be considered in the dynamic derailment simulations.

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Section: Track Flexibilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a simulation model for dynamic derailment analysis of high-speed trains

2014

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“…A critical issue is then to find the correct values of these parameters to represent adequately the actual track behaviour. This simple track model is adequate for simulating vehicle-track interaction and vehicle dynamics for frequencies up to about 20 Hz, but it is not suited to study other effects such as forces in individual track components, effects of wheel flats [123], local variations in track support and broken rail [124].…”

Section: How Is the Track Flexibility Included In Mbs?mentioning

confidence: 99%

Modelling of suspension components in a rail vehicle dynamics context

Bruni

Viñolas

Berg

et al. 2011

Vehicle System Dynamics

204

123

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Suspension components play key roles in the running behaviour of rail vehicles, and therefore, mathematical models of suspension components are essential ingredients of railway vehicle multi-body models. The aims of this paper are to review existing models for railway vehicle suspension components and their use for railway vehicle dynamics multi-body simulations, to describe how model parameters can be defined and to discuss the required level of detail of component models in view of the accuracy expected from the overall simulation model. This paper also addresses track models in use for railway vehicle dynamics simulations, recognising their relevance as an indispensable component of the system simulation model. Finally, this paper reviews methods presently in use for the checking and validation of the simulation model.

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“…General features of slab track systems were described in a previous paper (1). Other useful references are (27), (28), (29), (30) and (31).…”

Section: Slab Trackmentioning

confidence: 99%

Safety assessment of underground vehicles passing over highly resilient curved tracks in the presence of a broken rail

Suarez¹,

Rodríguez²,

Vázquez³

et al. 2012

Vehicle System Dynamics

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Vehicle-track interaction for a new resilient slab track designed to reduce noise and vibration levéis was analysed, in order to assess the derailment risk on curved track when encountering a broken rail. Sensitivity of the rail support spacing, of the relative position of the rail breakage between two adjacent rail supports and of running speed were analysed for two different elasticities of the rail fastening system.In none of the cases analysed was an appreciable difference between either of the elastic systems observed. As was expected, the most unfavourable situations were those with greater rail support spacing and those with greater distance from the breakage to the nearest rail support, although in none of the simulations performed did a derailment occur when running over the broken rail. When varying the running speed, the most favourable condition was obtained for an intermedíate speed, due to the superposition of two antagonistic effects.

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Safety assessment of underground vehicles passing over highly resilient straight track in the presence of a broken rail

Cited by 14 publications

References 16 publications

Development of a simulation model for dynamic derailment analysis of high-speed trains

Development of a simulation model for dynamic derailment analysis of high-speed trains

Modelling of suspension components in a rail vehicle dynamics context

Safety assessment of underground vehicles passing over highly resilient curved tracks in the presence of a broken rail

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