This paper describes the development of a reliable method of analysing train/track dynamics, which promotes both economy and ride quality. Train/track systems dynamics is a principal research area in the Division of Solid Mechanics at Chalmers University of Technology at Goeteborg, Sweden. The aim is to create a reliable computational tool for analysing the dynamics, enabling the selection of train and track components to be optimised with confidence at the design stage. A general method has been developed and applied to study the interaction between a moving dynamic system, the vehicle, and a continuous track structure. From a dynamic viewpoint, the important track components are rails, railpads, sleepers and roadbed (ballast). A useful mathematical model for studying track dynamics has been established by using beam elements. It contains flexible sleepers on elastic foundations. A method has been developed for calculating model parameters, such as characteristic frequencies and modes, of an undamped beam structure on an undamped foundation. A nonlinear time- variant vehicle model is used. Wheel tread irregularity and rail irregularity are discussed as application examples. Dynamic vertical interaction between a moving rigid wheel and a flexible track was investigated. The authors predict that this design method may become a very useful tool for track parameter optimisation, able to consider a wide range of loading situations and track irregularities.

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  • Authors:
    • Dahlberg, T
  • Publication Date: 1993-6


  • English

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  • Accession Number: 00662534
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Jul 28 1994 12:00AM