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Open AccessArticle

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

1
Department of Civil Engineering, School of Engineering, The University of Birmingham, Birmingham B152TT, UK
2
Birmingham Centre for Railway Research and Education, School of Engineering, The University of Birmingham, Birmingham B152TT, UK
3
School of Metallurgy and Materials, The University of Birmingham, Birmingham B152TT, UK
4
Loram Finland Oy, Yliopistonkatu 58 D, 33100 Tampere, Finland
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(19), 4080; https://doi.org/10.3390/app9194080
Received: 5 September 2019 / Revised: 23 September 2019 / Accepted: 25 September 2019 / Published: 30 September 2019
(This article belongs to the Special Issue Extreme Sciences and Engineering)
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. View Full-Text
Keywords: railway; turnout; switches and crossings; impact forces; contact forces; wheel-rail interaction; bearers; sleepers railway; turnout; switches and crossings; impact forces; contact forces; wheel-rail interaction; bearers; sleepers
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MDPI and ACS Style

Hamarat, M.; Kaewunruen, S.; Papaelias, M.; Silvast, M. New Insights from Multibody Dynamic Analyses of a Turnout System under Impact Loads. Appl. Sci. 2019, 9, 4080. https://doi.org/10.3390/app9194080

AMA Style

Hamarat M, Kaewunruen S, Papaelias M, Silvast M. New Insights from Multibody Dynamic Analyses of a Turnout System under Impact Loads. Applied Sciences. 2019; 9(19):4080. https://doi.org/10.3390/app9194080

Chicago/Turabian Style

Hamarat, Mehmet; Kaewunruen, Sakdirat; Papaelias, Mayorkinos; Silvast, Mika. 2019. "New Insights from Multibody Dynamic Analyses of a Turnout System under Impact Loads" Appl. Sci. 9, no. 19: 4080. https://doi.org/10.3390/app9194080

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