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On the Use of Under-Sleeper Pads in Tracks with Varying Track Stiffness
Linköping University, Department of Management and Engineering, Solid Mechanics . Linköping University, The Institute of Technology.
2009 (English)In: Proc 9th International Heavy Haul Conference, June 2009, Shanghai, P R China: Heavy Haul and Innovation Development, Beijing, China: China Railway Publishing House , 2009, 293-299 p.Conference paper, Published paper (Refereed)
Abstract [en]

The track stiffness experienced by a train will vary along the track. Sometimes the stiffness variation may be very large within a short distance. One example is when an unsupported sleeper is hanging in the rail. Track stiffness is then, locally at that sleeper, very low. At insulation joints the bending stiffness of the rail has a discontinuity. A third example of an abrupt change of track stiffness is the transition from an embankment to a bridge.

The variations of track stiffness will induce variations in the wheel/rail contact force. This will intensify track degradation such as increased wear, fatigue, track settlement due to permanent deformation of the ballast and the substructure, and so on. In the work reported here the possibility to smooth out track stiffness variations by use of under-sleeper pads is discussed. It is demonstrated that the wheel/rail contact force variations can be made small by modifying the stiffness variations along the track.

Place, publisher, year, edition, pages
Beijing, China: China Railway Publishing House , 2009. 293-299 p.
Keyword [en]
track stiffness variations, wheel/rail contact force, under-sleeper pads, ballast protection
National Category
Engineering and Technology Mechanical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-21392ISBN: 978-7-133-10145-9 (print)OAI: oai:DiVA.org:liu-21392DiVA: diva2:241182
Available from: 2009-10-01 Created: 2009-10-01 Last updated: 2009-10-01

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Dahlberg, Tore

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