| 1. |
- Hiensch, Martin, et al.
(författare)
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Two-material rail development : field test results regarding rolling contact fatigue and squeal behaviour
- 2005
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Ingår i: Wear. - : Elsevier BV. - 0043-1648 .- 1873-2577. ; 258:7-8, s. 964-972
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Tidskriftsartikel (refereegranskat)abstract
- Results from the European 5th Framework project “InfraStar” are presented. The InfraStar project is developing a two-material rail to increase the productivity and reliability of rail infrastructure. The two-material rail aims to be rolling contact fatigue (RCF) resistant and to reduce squeal noise.The InfraStar consortium has built a high level of wheel–rail expertise and understanding regarding RCF initiation and development, level and position of wheel–rail contact forces, and new interface materials and has gained experience in both laboratory and field test operating conditions. Within the project a validated theoretical train–track interaction model and a fatigue design model for two-material rails have been developed.This paper focuses on the field test results of the two-material rail, and how the predictions and expectations from the selection process match with the results observed in track. Results are very promising. The two-material rail prototypes, now over 1 year in track, show no RCF damage where the non-treated rail shows clear RCF damage. The development of the application process and other objectives of the InfraStar project are discussed.
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| 2. |
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| 3. |
- Chattopadhyay, G., et al.
(författare)
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Decision on economical rail grinding interval for controlling rolling contact fatigue
- 2005
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Ingår i: International Transactions in Operational Research. - : Wiley. - 0969-6016 .- 1475-3995. ; 12:6, s. 545-558
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Tidskriftsartikel (refereegranskat)abstract
- Rail players around the world have been increasing axle loads to improve the productivity of freight and heavy haul operations. This has increased the risk of surface cracks at curves because of rolling contact fatigue. Rail grinding has been considered an effective process for controlling these cracks and reducing risks of rail breaks. The complexity of deciding the optimal rail grinding intervals for improving the reliability and safety of rails is because of insufficient understanding of the various factors involved in the crack initiation and propagation process. This paper focuses on identifying the factors influencing rail degradation, developing models for rail failures and analyzing the costs of various grinding intervals for economic decision making. Various costs involved in rail maintenance, such as rail grinding, downtime, inspection, rail failures and derailment, and replacement of worn-out rails, are incorporated into the total cost model developed in this paper. Field data from the rail industry have been used for illustration.
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| 4. |
- Chattopadhyay, G., et al.
(författare)
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Estimation of parameter for rail degradation
- 2006
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Ingår i: Condition Monitoring and Diagnostic Engineering Management. - Luleå : Luleå tekniska universitet. - 9789163188060 ; , s. 605-612
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Konferensbidrag (refereegranskat)abstract
- Rail degradation is a significant problem for rail industries. Wear and fatigue comprises major component of rail degradation. It depends on operational conditions such as train speed, axle load, rail-wheel material type, size and profile, track construction, characteristics of bogie type, Million Gross Tonnes (MGT), curvature, traffic type, weather and environmental conditions. Development of prediction model related to those defects leading to rail breaks and/or rail replacements is vital for economic and safe operation of rail services. Estimation of parameter for failure models is necessary for accurate prediction of expected number of rail defects over a period of time based on Million Gross Tonnes (MGT) traffic, operating conditions and maintenance strategies. This paper focuses on collection and analysis of field data for various defects developed in rail track over a period of time for estimation of parameter for models predicting degradation of rails.
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| 5. |
- Chattopadhyay, G., et al.
(författare)
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Modelling and analysis of rail maintenance cost
- 2007
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Ingår i: International Journal of Production Economics. - : Elsevier BV. - 0925-5273 .- 1873-7579. ; 105:2, s. 475-482
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Tidskriftsartikel (refereegranskat)abstract
- Lubrication at wheel flange and rails on sharp curves is considered as an effective solution for reducing wear loss of material from effective cross-section of rail and wheels. Rail administrations around the world have been increasing axle loads and traffic densities in rail networks. This has led to traffic initiated wear, fatigue initiated surface cracks and rail breaks. Limited research has been carried out on the overall impact of combining lubrication strategies and rail grinding. This paper presents a model for lubrication strategy and rail-grinding interval to reduce wear and rolling contact fatigue (RCF). Data from rail industry is collected and used for numerical illustration.
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| 6. |
- Chattopadhyay, G., et al.
(författare)
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Rail-wheel lubrication : A conceptual decision model
- 2005
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Ingår i: International Conference on Operations Research Applications in Infrastructure Development in conjunction with the 2005 Annual Convention of Operational Research Society of India (ICORAID-2005-ORSI).
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Konferensbidrag (refereegranskat)
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| 7. |
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| 8. |
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| 9. |
- Frick, A., et al.
(författare)
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Rail grinding operation in Sweden
- 2007
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Ingår i: European Railway Review. - 1351-1599. ; 13:1, s. 69-73
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 10. |
- Fröhling, Robert, et al.
(författare)
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Guest editorial of Special Issue on High Tech in Heavy Haul
- 2009
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Ingår i: Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit. - : SAGE Publications. - 0954-4097 .- 2041-3017. ; 223, s. i-ii
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Tidskriftsartikel (refereegranskat)
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| 11. |
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| 12. |
- Larsson-Kråik, Per-Olof, et al.
(författare)
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Managing rail degradation on the Malmbanan
- 2007
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Ingår i: Railway Gazette International. - 0373-5346. ; 163:6
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- An upgrading programme started in 1998 and due to be completed by 2010 is allowing the introduction of heavier axleloads on Sweden's heavy haul iron ore line, permitting gross train weights to be increased to more than 8 000 tonnes. But the transition requires careful management if degradation of the infrastructure is to be kept under control
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| 13. |
- Larsson-Kråik, Per-Olof
(författare)
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Managing the wheel-rail interface : Railway infrastructure maintenance in a severe environment: The Swedish experience
- 2009
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Ingår i: Wheel—rail interface handbook. - : Woodhead Publishing Materials. - 9781845694128 - 9781845696788 ; , s. 633-652
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Bokkapitel (refereegranskat)abstract
- This chapter comprises a short introduction to and overview of the challenges that face engineers and researchers working in the field of heavy haul railway operations in a cold climate. If these problems are to be overcome, experts from different engineering disciplines need to work together in order to find solutions for the next generation of heavy haul operation, which will see heavier, longer and faster trains with new train control systems and operating philosophies. Malmbanan runs from the port in Narvik, across the Swedish/Norwegian border via the mines in Kiruna and Malmberget, to the port in Luleå on the coast of the Gulf of Bothnia. The 100 year old ore line runs through rough terrain including high mountains, peat, terraces situated on the fjords in Norway and numerous short bridges and culverts, and part runs above the Arctic Circle. Over the course of its life, the line and its ore traffic have been continuously upgraded. Today 750 m long trains with 30 tonne axle loads are in operation. If cost-efficient operation is to be maintained, engineers must continue to seek new and effective maintenance and operating systems for both infrastructure and rolling stock.
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| 14. |
- Patra, Ambika Prasad, et al.
(författare)
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Assessment and improvement of railway track safety
- 2009
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Ingår i: Special issue on heavy haul and innovative development. - Los Angeles : Sage Publications, Incorporated. ; , s. 91-98
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Konferensbidrag (refereegranskat)abstract
- In this paper, an approach has been developed to assess safety of the railway track by estimating the probability of derailment. Models for probability of derailment are developed based on undetected rail breaks and poor track quality using Petri-Nets and Monte Carlo simulations. The Effect of inspection intervals on lowering the probability has been analysed. The performance of the model is illustrated by an example from a track section of the iron ore line of Banverket (Swedish National Rail Administration).
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