Train Braking

Cruceanu, Ctlin

doi:10.5772/37552

Cited by 26 publications

(24 citation statements)

References 8 publications

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“…1. It consists of one (or more for distributed power trains) 1 Corresponding author. Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS.…”

Section: Automatic Air Brakementioning

confidence: 99%

“…System. The wagon brake system utilizes the well-known principle of a "triple valve" [1]: brakes are applied when brake pipe pressure is lower than auxiliary reservoir pressure, while brakes are released when the pressure difference is otherwise. These basic actions are achieved via the sliding valve and graduating valve as shown in Fig.…”

Section: Wagon Brakementioning

confidence: 99%

“…Brake is a critical aspect of railway train operations. Railway brake systems [1] are mainly of the air brake type which relies on pressurized air to push brake shoes or pads against wheel treads or brake disks. This paper focuses on conventional automatic (failsafe) air brake systems on long freight trains; electronically controlled pneumatic (ECP) brake systems [2] and other alternative brake systems [1] are not discussed.…”

Section: Introductionmentioning

confidence: 99%

“…Railway brake systems [1] are mainly of the air brake type which relies on pressurized air to push brake shoes or pads against wheel treads or brake disks. This paper focuses on conventional automatic (failsafe) air brake systems on long freight trains; electronically controlled pneumatic (ECP) brake systems [2] and other alternative brake systems [1] are not discussed. Comparatively, the automatic air brake systems on long freight trains pose greater challenges for modeling and simulations in the sense of complicated fluid dynamics modeling and intensive computing loads.…”

Section: Introductionmentioning

confidence: 99%

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Railway Air Brake Model and Parallel Computing Scheme

Cole

Spiryagin

et al. 2017

Journal of Computational and Nonlinear Dynamics

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This paper developed a detailed fluid dynamics model and a parallel computing scheme for air brake systems on long freight trains. The model consists of subsystem models for pipes, locomotive brake valves, and wagon brake valves. A new efficient hose connection boundary condition that considers pressure loss across the connection was developed. Simulations with 150 sets of wagon brake systems were conducted and validated against experimental data; the simulated results and measured results reached an agreement with the maximum difference of 15%; all important air brake system features were well simulated. Computing time was compared for simulations with and without parallel computing. The computing time for the conventional sequential computing scheme was about 6.7 times slower than real-time. Parallel computing using four computing cores decreased the computing time by 70%. Real-time simulations were achieved by parallel computing using eight computer cores.

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Section: Automatic Air Brakementioning

confidence: 99%

Section: Wagon Brakementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Railway Air Brake Model and Parallel Computing Scheme

Cole

Spiryagin

et al. 2017

Journal of Computational and Nonlinear Dynamics

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“…powering individual railcars for increased acceleration and top speed, 2 and developing newer/stronger braking systems. 3,4 The demands also triggered advancements to the physical infrastructure, both within the realm of traditional ballasted tracks, e.g. incorporating new sleeper designs 5,6 and upgrading vibration absorbing components, [7][8][9] as well as by exploring nontraditional track types, e.g.…”

Section: Introductionmentioning

confidence: 99%

Analyzing track responses to train braking

Bose

Levenberg

Zania

2018

Proceedings of the Institution of Mechanical Engineers, Part F:

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The objective of this study was to suggest a response-analysis framework for railway tracks subjected to braking. An analytical formulation was developed, in which the rail-track system was modeled as an infinite beam supported by an orthogonal Winkler foundation consisting of linear springs in perpendicular directions. The spring constants were varied over a wide range in order to represent different track types. Braking loads were simulated as representative sets of vertical and longitudinal forces, either concentrated or distributed. Considering a realistic set of model parameters, the approach was demonstrated by evaluating track responses for a single axle and for a full train. The computations included determination of axial rail stresses, forces at the base of a sleeper, and the associated friction demand required to resist longitudinal slippage. Based on these analyses, it is concluded that longitudinal track responses have a much longer influence zone compared to vertical track responses. This implies that calculations involving a full train must be done on a case-by-case basis, i.e., they cannot be deduced from a single axle analysis. It is also found that high values of friction demand may develop at the sleeper bases-indicating possible slippage. Overall, the proposed formulation provides a highly adaptable and easily implementable first-order mechanistic tool for analysis of track responses to decelerating vehicular loads.

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Railway traction

Agirre¹,

Abad²

2016

Power Electronics and Electric Drives for Traction Applications

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Train Braking

Cited by 26 publications

References 8 publications

Railway Air Brake Model and Parallel Computing Scheme

Railway Air Brake Model and Parallel Computing Scheme

Analyzing track responses to train braking

Railway traction

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