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Tolerable longitudinal forces for freight trains in tight S-curves using three-dimensional multi-body simulations
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. (Spårfordon)ORCID iD: 0000-0002-4477-971x
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-2571-4662
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.ORCID iD: 0000-0002-8237-5847
2020 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 234, no 5, p. 454-467Article in journal (Refereed) Published
Abstract [en]

With the need for increasing length of freight trains, Longitudinal Train Dynamics (LTD) and its influence on the running safety becomes a key issue. LTD is a complex issue with contributions from both the vehicles and the operating conditions such as infrastructure design, braking regimes, etc. Standards such as the UIC Code 530-2 and EN-15839 detail the procedure for on-track propelling tests that should be conducted to determine the running safety of a single wagon. Also, it only considers a single S-curve and specifies neighbouring wagons and buffers. The resulting LTD would hence not be able to judge the effects of various heterogeneities in the train formation such as the adjacent wagons, buffer types, carbody torsional stiffnesses, curvatures, etc. Here, there is a potential of using three-dimensional multi-body simulations to develop a methodology to judge the running safety of a train with regards to its longitudinal dynamic behaviour, subjected to various heterogeneities. A tool based on three-dimensional multi-body simulations has been developed to provide Longitudinal Compressive Force (LCF) limits, tolerable LCF for wagon combinations passing through S-curves of varying curvatures and assess the sensitivities of the various heterogeneities present in the train. The methodology is applied to open wagons of the ‘Falns’ type on tight S-curves by calculating the corresponding tolerable LCF and the effect of various parameters on the same is discussed.

Place, publisher, year, edition, pages
Sage Publications, 2020. Vol. 234, no 5, p. 454-467
Keywords [en]
S-curve, longitudinal train dynamics, freight wagons, longitudinal compressive forces, multi-body simulation, tolerable force, derailment.
National Category
Vehicle Engineering
Research subject
Järnvägsgruppen - Fordonsteknik
Identifiers
URN: urn:nbn:se:kth:diva-250776DOI: 10.1177/0954409719841794ISI: 000523043500002Scopus ID: 2-s2.0-85064678218OAI: oai:DiVA.org:kth-250776DiVA, id: diva2:1313723
Funder
EU, Horizon 2020, 730811
Note

QC 20190520

Available from: 2019-05-06 Created: 2019-05-06 Last updated: 2022-06-26Bibliographically approved
In thesis
1. Long freight trains and long-term rail surface damage
Open this publication in new window or tab >>Long freight trains and long-term rail surface damage
2022 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Track damage due to progressively increasing tonnage, especially due to longer and heavier freight trains, is one of the major problems faced in the European rail sector. In this context, to stay competitive, optimal track maintenance practices, track-friendly vehicles and safe operations of long freight trains assume prominence.

This PhD thesis studies long freight train operations and the long-term rail surface damage that they cause, to build a computer simulation-based framework for maintenance planning and assessment of running safety. 

The framework is formulated with four parts: long freight train operations, vehicle dynamics, rail surface damage and track maintenance. This is followed by a literature survey on each of the subtopics and how they are linked to each other.Safe operation of long freight trains in infrastructure bottlenecks such as S-curves is studied using three-dimensional multi-body simulations. Based on this, guidelines to build long freight trains and driving scenarios that can keep longitudinal in-train forces within acceptable limits have been provided. 

Multi-body simulation models of various freight bogies, including a novel design, are built and their dynamic running behaviour studied according to EN standards. The key focus is on track-loading and to this effect, methodologies for simulations-based assessment of `track-friendliness' of various bogie designs are studied. Various approaches to quantify rail surface damage using multi-body simulations in the form of wear and Rolling Contact Fatigue (RCF) are studied. Based on this, measures to ascertain similarities and differences in results from different approaches have been put forward. 

The impact of track maintenance, in the form of periodic rail reprofiling activities in different networks, on the evolution of rail surface damage is studied. It is found that optimal maintenance planning can be tailored depending on the type of traffic on the network.

Finally, various parts of the framework have been brought together to form a `train-track interaction' approach to facilitate optimal maintenance planning.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2022. p. 95
Series
TRITA-SCI-FOU ; 2022:01
Keywords
track friendliness; rail surface damage; multi-body simulation; longitudinal train dynamics; track maintenance; rolling contact fatigue, wear
National Category
Mechanical Engineering Vehicle Engineering Applied Mechanics
Research subject
Engineering Mechanics; Vehicle and Maritime Engineering; Järnvägsgruppen - Effektiva tågsystem för godstrafik
Identifiers
urn:nbn:se:kth:diva-307653 (URN)978-91-8040-130-2 (ISBN)
Public defence
2022-03-09, U1, Brinellvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
EU, Horizon 2020
Available from: 2022-02-07 Created: 2022-02-02 Last updated: 2022-06-25Bibliographically approved

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Krishna, Visakh VBerg, MatsStichel, Sebastian

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