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Dahlberg , Tore
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Publications (10 of 30) Show all publications
Rezaei, E. & Dahlberg, T. (2011). Dynamic behaviour of an in situ partially supported concrete railway sleeper. Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, 225(F5), 501-508
Open this publication in new window or tab >>Dynamic behaviour of an in situ partially supported concrete railway sleeper
2011 (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. 225, no F5, p. 501-508Article in journal (Refereed) Published
Abstract [en]

Analytical and finite-element solutions to the problem of a vibrating beam, fully or partly supported by an elastic foundation, are presented. An application example is the vertical (transverse) vibration of a concrete railway sleeper embedded in an elastic medium (the ballast). The sleeper is also elastically connected to the rails. Eigenfrequencies are calculated and vibration modes are discussed. The beam (sleeper) is divided into sections where each section may or may not be supported by the elastic foundation. Outside the voids (the non-supported parts of the sleeper) the sleeper is assumed fully attached to the support. Some conclusions are that the foundation stiffness influences the (almost) rigid-body vibration modes of the sleeper the most, whereas the lowest bending-mode eigenfrequencies are just slightly influenced by the foundation stiffness; higher eigenfrequencies are affected very little by the foundation. The influence of railpad (and rail) stiffness on the sleeper bending-mode eigenfrequencies is negligible.

Place, publisher, year, edition, pages
Professional Engineering Publishing (Institution of Mechanical Engineers), 2011
Keywords
railway sleeper, concrete sleeper, elastic foundation, eigenfrequencies
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-70522 (URN)10.1177/2041301710392492 (DOI)000294071600007 ()
Available from: 2011-09-12 Created: 2011-09-12 Last updated: 2017-12-08
Dahlberg, T. (2010). Railway Track Stiffness Variations - Consequences and Countermeasures. INTERNATIONAL JOURNAL OF CIVIL ENGINEERING, 8(1), 1-12
Open this publication in new window or tab >>Railway Track Stiffness Variations - Consequences and Countermeasures
2010 (English)In: INTERNATIONAL JOURNAL OF CIVIL ENGINEERING, ISSN 1735-0522, Vol. 8, no 1, p. 1-12Article in journal (Refereed) Published
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 insulated joints the bending stiffness of the rail has a discontinuity implying a discontinuity also of the track stiffness. A third example of an abrupt change of track stiffness is the transition from an embankment to a bridge. At switches both mass and stiffness change rapidly 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. As soon as the track geometry starts to deteriorate, the variations of the wheel/rail interaction forces will increase, and the track deterioration rate increases. In the work reported here the possibility to smooth out track stiffness variations is discussed. It is demonstrated that by modifying the stiffness variations along the track, for example by use of grouting or under-sleeper pads, the variations of the wheel/rail contact force may be considerably reduced.

Keywords
Under-sleeper pads, track stiffness variations, wheel/rail contact force, ballast protection
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-54778 (URN)000275852300001 ()
Available from: 2010-04-09 Created: 2010-04-09 Last updated: 2010-04-19
Dahlberg, T. (2009). On the Use of Under-Sleeper Pads in Tracks with Varying Track Stiffness. In: Proc 9th International Heavy Haul Conference, June 2009, Shanghai, P R China: Heavy Haul and Innovation Development (pp. 293-299). Beijing, China: China Railway Publishing House
Open this publication in new window or tab >>On the Use of Under-Sleeper Pads in Tracks with Varying Track Stiffness
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, p. 293-299Conference 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
Keywords
track stiffness variations, wheel/rail contact force, under-sleeper pads, ballast protection
National Category
Engineering and Technology Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-21392 (URN)978-7-133-10145-9 (ISBN)
Available from: 2009-10-01 Created: 2009-10-01 Last updated: 2009-10-01
Dahlberg, T. (2009). Railway track stiffness variations - consequences and countermeasures. In: Proc of the 2nd International Conference on Recent Advances in Railway Engineering (pp. 38-46). Teheran: Iran University of Science and Technology
Open this publication in new window or tab >>Railway track stiffness variations - consequences and countermeasures
2009 (English)In: Proc of the 2nd International Conference on Recent Advances in Railway Engineering, Teheran: Iran University of Science and Technology , 2009, p. 38-46Conference paper, Published paper (Other academic)
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 insulated joints the bending stiffness of the rail has a discontinuity implying a discontinuity also of the track stiffness. A third example of an abrupt change of track stiffness is the transition from an embankment to a bridge. At switches both mass and stiffness change rapidly.

 

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. As soon as the track geometry starts to deteriorate, the variations of the wheel/rail interaction forces will increase, and the track deterioration rate increases. In the work reported here the possibility to smooth out track stiffness variations is discussed. It is demonstrated that by modifying the stiffness variations along the track, for example by use of grouting or under-sleeper pads, the variations of the wheel/rail contact force may be considerably reduced.

Place, publisher, year, edition, pages
Teheran: Iran University of Science and Technology, 2009
Keywords
Under-sleeper pads, track stiffness, wheel/track contact force, ballast protection
National Category
Engineering and Technology Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-21391 (URN)
Note
Invited key-note lectureAvailable from: 2009-10-01 Created: 2009-10-01 Last updated: 2009-10-01
Burrow, M., Texeira, P., Berggren, E. & Dahlberg, T. (2009). Track stiffness considerations for high speed railway lines. In: Nicholas P. Scott (Ed.), Railway Transportations: Policies, Technology and Perspectives (pp. 425). Hauppauge, NY: Nova Science Publishers
Open this publication in new window or tab >>Track stiffness considerations for high speed railway lines
2009 (English)In: Railway Transportations: Policies, Technology and Perspectives / [ed] Nicholas P. Scott, Hauppauge, NY: Nova Science Publishers , 2009, p. 425-Chapter in book (Other academic)
Abstract [en]

     This book provides the latest scientific research regarding the importance of infrastructure charges in establishing competitive conditions in the railway market. The current charging regimes applied throughout the EU member states are analyzed as well as the planning and scheduling that determine how and when the company's resources will be used in the case of railway organizations. Railway noise emission and its reduction are considered among the most important topics in the future development of transportation systems. This book gives an overview on the noise emitted by wheels and rails from the basic emission mechanisms up to noise attenuation by means of passive/active control. The importance of the vertical track stiffness as a means to guide railway track bed design for high speed railway lines are discussed as well. A rational approach to substructure design is described, which it is hoped will further an understanding of the process of appropriate track design and enable the adaptation of existing design procedures to provide a realistic design for the conditions at hand.

Place, publisher, year, edition, pages
Hauppauge, NY: Nova Science Publishers, 2009
Keywords
Railway Transportation
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-43706 (URN)74574 (Local ID)978-1-60692-8639 (ISBN)160-69-2863-5 (ISBN)74574 (Archive number)74574 (OAI)
Note

In press 2008

Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-05-03Bibliographically approved
Dahlberg, T. (2009). Vågutbredning i kontaktledningar (Wave propagations in contact wires, in Swedish).. Linköping
Open this publication in new window or tab >>Vågutbredning i kontaktledningar (Wave propagations in contact wires, in Swedish).
2009 (Swedish)Report (Other academic)
Abstract [sv]

Teoretisk analys av vågutbredning i kontaktledning modellerad som en spänd sträng med böjstyvhet (eller axialbelastad balk) belastad med rörlig kraft.

Place, publisher, year, edition, pages
Linköping: , 2009. p. 62
Keywords
kontaktledning, vågutbredning
National Category
Engineering and Technology Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-21420 (URN)
Projects
Banverkets kontaktlednings/strömavtagarprojekt
Note
Rapport för BanverketAvailable from: 2009-10-01 Created: 2009-10-01 Last updated: 2009-10-01
Dahlberg , T. (2008). Modelling of the dynamic behaviour of in situ concrete railway sleepers. Proceedings of the Institution of Mechanical Engineers. P. F, Journal of rail and rapid transit, 222(4), 433-440
Open this publication in new window or tab >>Modelling of the dynamic behaviour of in situ concrete railway sleepers
2008 (English)In: Proceedings of the Institution of Mechanical Engineers. P. F, Journal of rail and rapid transit, ISSN 0954-4097 , Vol. 222, no 4, p. 433-440Article in journal (Refereed) Published
Abstract [en]

An analytical Solution to the problem of a vibrating beam on an elastic foundation is presented. An application example of a concrete railway sleeper embedded in an elastic medium (the ballast) is provided. The sleeper is also elastically connected to the rails. The Rayleigh-Timoshenko (R-T) beam theory for a beam on an elastic foundation is used and eigenfrequencies are calculated. The beam (sleeper) is divided into three sections that have piecewise constant properties. The central portion of the beam is slightly thinner than the outer parts, and each one of the three parts may or may not be supported by the elastic foundation. The elastic connections to the rails are situated at the two joinings of the three sleeper sections.

Conclusions drawn are that the Euler-Bernoulli beam theory can be used to calculate two, or maximum three, eigenfrequencies of the sleeper. For higher frequencies, the R-T beam theory should be used. The foundation stiffness influences the lowest bending-mode eigenfrequency the most; higher eigenfrequencies are practically unaffected by the foundation stiffness. The influence of railpad (and rail) stiffness on the sleeper eigenfrequencies is negligible.

Keywords
railway sleeper, concrete sleeper, Rayleigh-Timoshenko beam theory, elastic foundation, eigenfrequencies
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-16182 (URN)10.1243/09544097JRRT207 (DOI)
Available from: 2009-01-09 Created: 2009-01-09 Last updated: 2009-04-25
Dahlberg, T. (2007). Railway Track Stiffness Variations - A Literature Review. Linköping: Linköping University
Open this publication in new window or tab >>Railway Track Stiffness Variations - A Literature Review
2007 (English)Report (Other academic)
Place, publisher, year, edition, pages
Linköping: Linköping University, 2007
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-41592 (URN)58061 (Local ID)58061 (Archive number)58061 (OAI)
Available from: 2009-10-10 Created: 2009-10-10
Dahlberg, T. (2006). Catenary, pantograph, and their interaction. Vehicle System Dynamics, 44(8)
Open this publication in new window or tab >>Catenary, pantograph, and their interaction
2006 (English)In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 44, no 8, p. 591-593Other (Other academic)
Abstract [en]

[No abstract available]

Publisher
p. 591-593
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-50174 (URN)10.1080/00423110600735894 (DOI)
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-12
Dahlberg, T. (2006). Catenary, pantograph, and their interaction. Vehicle System Dynamics, 44(8), 591-593
Open this publication in new window or tab >>Catenary, pantograph, and their interaction
2006 (English)In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 44, no 8, p. 591-593Article in journal (Other academic) Published
Abstract [en]

  

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-41593 (URN)58062 (Local ID)58062 (Archive number)58062 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2017-12-13
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