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Long term rail surface damage considering maintenance interventions
KTH, School of Engineering Sciences (SCI), Engineering Mechanics. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group. (Spårfordon)ORCID iD: 0000-0002-4477-971x
KTH, School of Engineering Sciences (SCI), Engineering Mechanics.ORCID iD: 0000-0002-6346-6620
KTH, School of Engineering Sciences (SCI), Engineering Mechanics.ORCID iD: 0000-0003-1583-4625
KTH, School of Engineering Sciences (SCI), Engineering Mechanics.ORCID iD: 0000-0002-8237-5847
2020 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 460, article id 203462Article in journal (Refereed) Published
Abstract [en]

A new methodology to estimate costs for wear and Rolling Contact Fatigue (RCF) on rails that cause a major portion of track maintenance costs is presented. It is demonstrated for a standard UIC-Y25 bogie and the FR8RAIL bogie, a softer and cross-braced iteration of the former, based on running conditions for the Swedish iron-ore line. Various non-linearities in the vehicle and track models have been considered. The rail profile evolution and the surface-initiated fatigue on the rail surface for different track radii with progressive tonnage are calculated using iterative multibody simulations. Additionally, the impact of maintenance measures on the long-term rail profile evolution has been considered with optimal preventive rail grinding actions implemented at fixed tonnage intervals based on the recommendations from EN13231-5. The rail profile attributes after 100 Mega Gross Tonnes passage are presented and discussed for both running gears. In doing so, the methodology addresses the long-term ‘track-friendliness’ of running gears considering wear, RCF and the intermediate track maintenance strategies.

Place, publisher, year, edition, pages
Elsevier BV , 2020. Vol. 460, article id 203462
Keywords [en]
Track-friendliness Rail wear and RCF Preventive grinding Rail profile evolution Running gear
National Category
Applied Mechanics Vehicle Engineering Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Järnvägsgruppen - Fordonsteknik; Engineering Mechanics; Järnvägsgruppen - Infrastruktur; Vehicle and Maritime Engineering
Identifiers
URN: urn:nbn:se:kth:diva-280274DOI: 10.1016/j.wear.2020.203462ISI: 000581655300026Scopus ID: 2-s2.0-85090699625OAI: oai:DiVA.org:kth-280274DiVA, id: diva2:1464380
Funder
EU, Horizon 2020, 730617
Note

QC 20201201

Available from: 2020-09-06 Created: 2020-09-06 Last updated: 2022-06-25Bibliographically 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 VHossein Nia, SaeedCasanueva, CarlosStichel, Sebastian

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Applied MechanicsVehicle EngineeringTribology (Interacting Surfaces including Friction, Lubrication and Wear)

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