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On the influence of Freight Traffic Operational Conditions on Track Deterioration Cost
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Railway Technology. KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Railway Technology.ORCID iD: 0000-0002-8237-5847
2007 (English)In: Proceedings of the International Heavy Haul Conference, pp. 445-452, Kiruna, June 11-13, 2007, 2007, Vol. 12, no 2, 445-452 p.Conference paper, Published paper (Refereed)
Abstract [en]

In order to increase the understanding of the running behaviour of freight wagons and the interaction between vehicles and track, a research project was started at KTH in 1996. The background to the initiation of the project were plans to increase axle load, loading gauge and speed of freight trains to make freight traffic on rail more competitive. In the present paper, the effect of different types of running gear and operational conditions on the track deterioration marginal cost in terms of settlement in the ballast, component fatigue and wear and RCF are investigated. Considerable differences in track deterioration cost per produced ton-km for the different types of running gear are observed. Axleload is an important parameter for settlement and component fatigue. Also the height of centre of gravity has significant influence on track deterioration, especially on track sections with high cant deficiency or cant excess.

Place, publisher, year, edition, pages
2007. Vol. 12, no 2, 445-452 p.
Keyword [en]
Freight wagons; Rail vehicle dynamics; Simulations; Track deterioration; Axle loads; Centre of gravity; Freight traffic; Freight trains; Freight wagon; Marginal costs; Operational conditions; Rail vehicle dynamics; Running gear; Track deterioration
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-7375OAI: oai:DiVA.org:kth-7375DiVA: diva2:12381
Conference
International Heavy Haul Conference,2007
Note

QC 20100802. Konferens: The International Heavy Haul Conference

QC 20151223

Available from: 2007-07-13 Created: 2007-07-13 Last updated: 2015-12-23Bibliographically approved
In thesis
1. Dynamic Vehicle-Track Interaction of European Standard Freight Wagons with Link Suspension
Open this publication in new window or tab >>Dynamic Vehicle-Track Interaction of European Standard Freight Wagons with Link Suspension
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The link suspension is the most prevailing suspension system for freight wagons in Central and Western Europe. The system design is simple and has existed for more than 100 years. However, still its characteristics are not fully understood. This thesis investigates the dynamic performance of freight wagons and comprises five parts:

In the first part a review of freight wagon running gear is made. The different suspension systems are described and their advantages and disadvantages are discussed.

The second part focuses on the lateral force-displacement characteristics of the link suspension. Results from stationary measurements on freight wagons and laboratory tests of the link suspension characteristics are presented. To improve the understanding of various mechanisms and phenomena in link suspension systems, a simulation model is developed.

In the third part the multibody dynamic simulation model is discussed. The previous freight wagon model developed at KTH is able to explain many of the phenomena observed in tests. In some cases, however, simulated and measured running behaviour differ. Therefore, a new simulation model is presented and validated against on-track test results. The performance of standard two-axle freight wagons is investigated. The most important parameters for the running behaviour of the vehicle are the suspension characteristics. The variation in characteristics between different wagons is large due to geometrical tolerances of the components, wear, corrosion, moisture or other lubrication. The influence of the variation in suspension characteristics and other parameters on the behaviour of the wagon, on tangent track and in curves, is discussed. Finally, suggestions for improvements of the system are made.

A majority of the traffic related track deterioration cost originates from freight traffic. With heavier and faster freight trains the maintenance cost is likely to increase. In the fourth part the possibility to improve ride comfort and reduce track forces on standard freight wagons with link suspension is discussed. The variation of characteristics in link suspension running gear is considerable and unfavourable conditions leading to hunting are likely to occur. Supported by on-track tests and multibody dynamic simulations, it is concluded that the running behaviour of two-axled wagons with UIC double-link suspension as well as wagons with link suspension bogies (G-type) can be improved when the running gear are equipped with supplementary hydraulic dampers.

Finally in the fifth part the effects of different types of running gear and operational conditions on the track deterioration marginal cost — in terms of settlement in the ballast, component fatigue, wear and RCF — is investigated. Considerable differences in track deterioration cost per produced ton-km for the different types of running gear are observed. Axle load is an important parameter for settlement and component fatigue. Also the height of centre of gravity has significant influence on track deterioration, especially on track sections with high cant deficiency or cant excess.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. x, 34 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2007:36
Keyword
railway; freight wagon; running gear; link suspension; laboratory test;, stiffness; dry friction; hysteresis; simulation; vehicle-track interaction, multibody; simulation; MBS
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-4461 (URN)978-91-7178-727-9 (ISBN)
Public defence
2007-08-29, F3, Lindstedsvägen 26, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100802Available from: 2007-07-13 Created: 2007-07-13 Last updated: 2010-08-02Bibliographically approved

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Stichel, Sebastian

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