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  • 1.
    Burrow, Michael
    et al.
    Center for Railway research and Education University of Birmingham, UK.
    Texeira, Paulo
    CENIT Technical University of Catalonia, Barcelona, Spain.
    Berggren, Eric
    Banverket, Borlänge.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics.
    Track stiffness considerations for high speed railway lines2009In: 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.

  • 2.
    Dahlberg , Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics .
    Modelling of the dynamic behaviour of in situ concrete railway sleepers2008In: 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)
    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.

  • 3.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics .
    Catenary, pantograph, and their interaction2006In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 44, no 8, p. 591-593Other (Other academic)
    Abstract [en]

    [No abstract available]

  • 4.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics .
    Catenary, pantograph, and their interaction2006In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 44, no 8, p. 591-593Article in journal (Other academic)
    Abstract [en]

      

  • 5.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Dynamic train/track interaction model2004Report (Other academic)
  • 6.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Kontinuerligt understödd räl2004Patent (Other (popular science, discussion, etc.))
  • 7.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Modelling of railroad track settlements2001In: TransportForum,2001, 2001Conference paper (Other academic)
    Abstract [en]

          

  • 8.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Moving force on an axially loaded beam - With applications to a railway overhead contact wire2006In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 44, no 8, p. 631-644Article in journal (Refereed)
    Abstract [en]

    Using modal analysis, the deflection of a beam subjected to an axial tensile force N and a moving vertical force P , has been determined. This solution was exploited in a study of deflection and wave propagation in the contact wire of a railway overhead catenary system. For moderate values of speed c of the moving force P ( i.e ., c less than half the lowest critical speed c crit ) travelling waves reflect at the boundaries of the contact wire so that the waves meet and catch up with the moving force several times. In practice, when a pantograph (here modelled by the force P ) touches the contact wire some distance from the end of the wire, waves are sent out both in the forward and backward direction, giving even more reflections and wave interactions with the contact force. These waves will add or subtract to the wire deflection at the point of force application. The stress in the wire due to bending is estimated and it appears to be moderate for the speeds investigated here ( i.e ., for c < 0.5ccrit). Close to the critical speed, however, bending stresses will be significant.

  • 9.
    Dahlberg, Tore
    Linköping University, Department of Management and Engineering, Solid Mechanics . Linköping University, The Institute of Technology.
    On the Use of Under-Sleeper Pads in Tracks with Varying Track Stiffness2009In: 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 (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.

  • 10.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Procedure to calculate deflections of curved beams2004In: International journal of engineering education, ISSN 0949-149X, Vol. 20, p. 503-513Article in journal (Refereed)
  • 11.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics .
    Railway Track Stiffness Variations - A Literature Review2007Report (Other academic)
  • 12.
    Dahlberg, Tore
    Linköping University, Department of Management and Engineering, Solid Mechanics . Linköping University, The Institute of Technology.
    Railway track stiffness variations - consequences and countermeasures2009In: Proc of the 2nd International Conference on Recent Advances in Railway Engineering, Teheran: Iran University of Science and Technology , 2009, p. 38-46Conference 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.

  • 13.
    Dahlberg, Tore
    Linköping University, Department of Management and Engineering, Solid Mechanics . Linköping University, The Institute of Technology.
    Railway Track Stiffness Variations - Consequences and Countermeasures2010In: INTERNATIONAL JOURNAL OF CIVIL ENGINEERING, ISSN 1735-0522, Vol. 8, no 1, p. 1-12Article in journal (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 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.

  • 14.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Rewiew of research on railroad ballast as track substructure2000In: TransportForum,1999, 2000Conference paper (Other academic)
  • 15.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics .
    Some railroad settlement models - A critical review2001In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 215, no 4, p. 289-300Conference paper (Other academic)
    Abstract [en]

    Mathematical models to simulate railroad track settlements are reviewed and commented upon. There do not seem to be any generally accepted damage and settlement equations describing the long-term behaviour of the track. This also seems to be the case for the ballast material. Most descriptions of the settlement found in the literature are empirical, only different suggestions to describe the track settlement from a phenomenological point of view are available. The track settlement is mostly considered to be a function of number of loading cycles and/or a function of the magnitude of the loading. The settlement should also be a function of the properties of the ballast and subground materials, but very little has been found on this in the literature. By use of the finite element program LS-DYNA, a computer model (very simple) has been created to simulate the long-term behaviour of the track. The model consists of a rail, rigid sleepers, non-linear ballast springs (stiffnesses) and ballast damping. In a solid element beneath each ballast spring, track settlement can be accumulated. Settlement will occur if the stresses in that element exceed a yield limit of the element material. Also 'hanging sleepers' may be modelled and obtained as a result of the track settlement.

  • 16.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics .
    Summary of work performed by Linköping university in the SUPERTRACK project2005Report (Other academic)
  • 17.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    The Effect of Modal Coupling in Random Vibration Analysis1999In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, p. 157-176Article in journal (Other academic)
  • 18.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics.
    Track Issues2006In: Handbook of Railway Vehicle Dynamics / [ed] Simon Iwnicki, New York: Taylor & Francis Group , 2006, p. 143-179Chapter in book (Other academic)
    Abstract [en]

       Understanding the dynamics of railway vehicles, and indeed of the entire vehicle–track system, is critical to ensuring safe and economical operation of modern railways. As the challenges of higher speed and higher loads with very high levels of safety require ever more innovative engineering solutions, better understanding of the technical issues and use of new computer based tools is required. Encompassing the field from historical development to state-of-the-art modeling and simulation methods, Simon Iwnicki’s Handbook of Railway Vehicle Dynamicssets a new standard of authority and practicality in the study of railway vehicle dynamics.

    Drawing on the experiences and research of leading international experts, this critical reference surveys the main areas of railway vehicle dynamics. Through mathematical analysis and practical examples, it builds a deep and functional understanding of the wheel–rail interface, suspension and suspension component design, simulation and testing of electrical and mechanical systems, interaction with surrounding infrastructure, and noise and vibration. In-depth discussions deconstruct the components of both vehicle and track systems, explain their contribution to dynamic behavior, and evaluate the advantages and disadvantages of various practical solutions. The book also considers the unique issues of railway tribology, gauging, and derailment.

    Coverage of computer models, test procedures, roller rigs, and scale testing completes this essential handbook. Whether for the newcomer or the seasoned professional, the Handbook of Railway Vehicle Dynamics is an indispensable tool for modern railway vehicle design.

  • 19.
    Dahlberg, Tore
    Linköping University, Department of Management and Engineering, Solid Mechanics . Linköping University, The Institute of Technology.
    Vågutbredning i kontaktledningar (Wave propagations in contact wires, in Swedish).2009Report (Other academic)
    Abstract [sv]

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

  • 20.
    Dahlberg, Tore
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics .
    Larsson, Rikard
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics .
    Influence of railway track stiffness variations on wheel/rail contact force2006In: Tracks for high-speed railways,2006, Porto: Faculty of Eng, Univ of Porto , 2006, p. 67-Conference paper (Refereed)
  • 21.
    Dahlberg, Tore
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Lundqvist, Andreas
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Dynamic forces in railway track due to unsupported sleeper2004In: Nordic Vibration Research 2004,2004, Stockholm: SVIB , 2004, p. 14:1-14:11Conference paper (Other academic)
  • 22.
    Dahlberg, Tore
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Lundqvist, Andreas
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Dynamic forces in railway track due to unsupported sleepers2004In: Twelfth Nordic Seminar in Railway Mechanics,2004, 2004Conference paper (Other academic)
  • 23.
    Dahlberg, Tore
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Lundqvist, Andreas
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Dynamic train/track interaction including model for track settlement evolvement2004Report (Other academic)
  • 24.
    Dahlberg, Tore
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics .
    Lundqvist, Andreas
    SAAB.
    Verification of track model versus Spanish measurements2005Report (Other academic)
    Abstract [en]

      

  • 25.
    Lundqvist, Andreas
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Dynamic train/track interaction including model for track settlement evolvement2004In: 18th IAVSD Symposium on Dynamics of Vehicles on Roads and on Tracks,2003, London, UK: Taylor & Francis Group , 2004, p. 667-Conference paper (Refereed)
  • 26.
    Lundqvist, Andreas
    et al.
    Linköping University, Department of Mechanical Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
    Dahlberg, Tore
    Linköping University, Department of Mechanical Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
    Dynamic train/track interaction including model for track settlement evolvement2004In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159, Vol. 41 (Supplement), p. 667-676Article in journal (Other academic)
    Abstract [en]

    A ballasted railway track exposed to train traffic will degenerate. Track alignment and track level will deteriorate. Settlements of the track (loss of track level and alignment) require maintenance; the track is lifted and aligned, and new ballast material is injected under the sleepers. This paper presents a computer model by which the dynamic train/track interaction can be simulated and the permanent deformation of the track (i.e. track settlements) can be calculated. The voided sleepers ("hanging" sleepers) phenomenon will also be discussed.

  • 27.
    Lundqvist, Andreas
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Dahlberg, Tore
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Solid Mechanics.
    Dynamic train/track interaction model: verification, modelling of track settlement, hanging sleeper (s), and varying track stiffness2004Report (Other academic)
  • 28.
    Lundqvist, Andreas
    et al.
    Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
    Dahlberg, Tore
    Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
    Load impact on railway track due to unsupported sleepers2005In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 219, no 2, p. 67-77Article in journal (Refereed)
    Abstract [en]

    Ballasted railway tracks will settle as a result of permanent deformations in the ballast and in the underlying material layers. The settlement is caused by the repeated traffic loading and the severity of the settlement depends on the quality and the behaviour of the ballast, the sub-ballast, and the subgrade.

    As the behaviour of the material is not exactly the same under all sleepers, and since the loading of the track is irregular, the amount of settlement will differ from one sleeper to another. A result of this is that the sleepers are not always fully supported, and some sleepers may even become completely unsupported (voided). A gap appears between the sleeper and the ballast bed. As soon as the track geometry starts to deteriorate, the variations of the train/track interaction force increase, and this speeds up the track deterioration rate.

    This paper presents a computer model by which the dynamic train/track interaction can be simulated. The influence of one or several voided sleepers on the train/track interaction force and on the track dynamics is investigated. Track settlement due to hanging sleeper(s) is discussed.

  • 29.
    Lundqvist, Andreas
    et al.
    Linköping University, Department of Mechanical Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
    Dahlberg, Tore
    Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
    Railway track stiffness variation - consequences and countermeasures2005In: 19th IAVSD Symposium of Dynamics of Vehicles on Roads and Tracks, 2005, Milano: Dept Mech Eng, Politecnico di Milano , 2005Conference paper (Other academic)
    Abstract [en]

    The track stiffness experienced by a train will vary along the track. Sometimes the stiffness variation can be very large whitin short distances. These changes in track stiffness will cause variations in the train/track interaction forces, and force variations will normaly imply settlements of the track as a result of permanent deformation in the ballast and in the underlying structure.

    Since the behaviour of the ballast and subground material is not exactly the same under all sleepers. and since the loading of the track is irregular. the amount of settlement will differ from one sleeper to another. As soon as the track geometry starts to deteriorate, the variations of the train/track interaction force increase, and this speeds up the track deterioration rate.

    This paper discusses how the transition zone between two track stiffnesses should be designed to reduce the track settlement. The transition from one track stiffness to another is optimized to obtain a wheel/rail contact force with as small variations as possible. A smooth wheel/rail contact force at the transition area will minimize the track settlement.

  • 30.
    Rezaei, E
    et al.
    Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
    Dahlberg, Tore
    Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
    Dynamic behaviour of an in situ partially supported concrete railway sleeper2011In: 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)
    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.

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