Contact Conditions over Turnout Crossing Noses

Hamarat, Mehmet; Kaewunruen, Sakdirat; Papaelias, Mayorkinos

doi:10.1088/1757-899x/471/6/062027

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…erefore, passing trains caused increased acceleration impulses due to interruption of the rail continuity as wheels of the train hit the crossing nose. In a case of a movable crossing that is used in some S&C designs especially for high-speed tracks, these impulses would be lower but still detectable [16].…”

Section: Data Acquisitionmentioning

confidence: 99%

Neural Network-Based Train Identification in Railway Switches and Crossings Using Accelerometer Data

Krč

Podroužek

Kratochvílová

et al. 2020

Journal of Advanced Transportation

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This paper aims to analyse possibilities of train type identification in railway switches and crossings (S&C) based on accelerometer data by using contemporary machine learning methods such as neural networks. That is a unique approach since trains have been only identified in a straight track. Accelerometer sensors placed around the S&C structure were the source of input data for subsequent models. Data from four S&C at different locations were considered and various neural network architectures evaluated. The research indicated the feasibility to identify trains in S&C using neural networks from accelerometer data. Models trained at one location are generally transferable to another location despite differences in geometrical parameters, substructure, and direction of passing trains. Other challenges include small dataset and speed variation of the trains that must be considered for accurate identification. Results are obtained using statistical bootstrapping and are presented in a form of confusion matrices.

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Section: Data Acquisitionmentioning

confidence: 99%

Neural Network-Based Train Identification in Railway Switches and Crossings Using Accelerometer Data

Krč

Podroužek

Kratochvílová

et al. 2020

Journal of Advanced Transportation

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“…A common numerical tool for whole turnout analyses is multi-body simulation (MBS) where the bodies are simulated by multi degrees of freedom, and the contact theories are used to estimate contact forces. In general, Hertzian, Non-Hertzian, or Multi-Hertzian contact theories have been adopted to calculate normal contact forces and Kalker's theories or Polach's method have been used for tangential forces [23,24]. The disadvantage of the MBS is the limitation of the accuracy of estimated contact forces.…”

Section: Geometry and Materials Propertiesmentioning

confidence: 99%

“…Several wheel-rail contact theories are used to estimate normal and tangential contact forces in numerical analysis procedures [23,24]. Hertzian Contact Theory for normal forces and Kalker's Fastsim for tangential forces are the most common and easy-to-adopt contact theories.…”

Section: Wheel-rail Contact Modelmentioning

confidence: 99%

New Insights from Multibody Dynamic Analyses of a Turnout System under Impact Loads

et al. 2019

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A railway turnout is an essential infrastructure for managing railway traffic flexibility. In contrast, it imposes restrictions on train operations such as lower operational speeds through the turnout due to the complex movements of trains over the turnout. This results in the large-amplitude dynamic responses of the train-turnout interaction. Previous studies have focused on the train-turnout interactions entailing the wheel-rail contact forces and stresses. Very few of the studies considered the effects of the contact forces on the turnout structure and its components such as sleepers and bearers. Those previous studies neglected the dynamic forces and estimated the behavior of train-turnout interactions based on quasi-static calculations. In reality, turnouts are subjected to high impact forces, which can be higher than the permissible track forces. Consequently, a numerical model capable of determining impact forces was developed here, to evaluate the dynamic behaviors of a railway turnout and their effects on such turnout components as bearers, ballast, and so on. The model consists of a structured beam grillage laying on an elastic foundation with rigid wheelsets and a bogie. The model was verified by field measurements. The new insight stemmed from this study shows that neglecting the contribution of dynamic forces can result in the unsafe underestimation of train turnout behaviors.

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Experimental Investigation of the Influence of Train Velocity and Travel Direction on the Dynamic Behavior of Stiff Common Crossings

et al. 2019

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Common crossing rails are subjected to a rapid deterioration of the rolling surface due to a dynamic loading of trains. The present study is devoted to an experimental study of the displacement and rail strain measurements in the common crossing. The experimental measurements were carried out for two stiff common crossings under the dynamic loading of high-speed train for the velocity range of 54-254 km/h. The results showed 2.5 times increase of the maximal displacements within the velocity range. The absence of the difference in the displacements between the trailing and the facing travel direction is explained with the relative displacement measurements between the rail and the sleeper and the different dynamic impact loading for the wing rail. The proposed model-based analysis of the absolute measurement of rail strain enables us to estimate the dynamic factor under the impact loading. The wing rail for trailing direction is almost twice as highly loaded as the frog rail for the facing direction. The maximal dynamic factor for the trailing direction shows almost no change for the velocities of more than 200 km/h.

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Contact Conditions over Turnout Crossing Noses

Cited by 3 publications

References 23 publications

Neural Network-Based Train Identification in Railway Switches and Crossings Using Accelerometer Data

Neural Network-Based Train Identification in Railway Switches and Crossings Using Accelerometer Data

New Insights from Multibody Dynamic Analyses of a Turnout System under Impact Loads

Experimental Investigation of the Influence of Train Velocity and Travel Direction on the Dynamic Behavior of Stiff Common Crossings

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