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The Influence of Track Foundation Stiffness on the Resistance to Movement of Rolling Stock

Abstract

The paper presents the results of studies of the effect of track foundation stiffness on the resistance to movement of rolling stock for the point and solid arrangement of elastic elements in the upper track structure. Graphs of the dependences of the rolling friction coefficient, the friction force, and the power of the friction force on the stiffness of elastic elements are plotted. Recommendations are given on the use of the results when performing calculations of the resistance to movement caused by friction forces in the framework of traction calculations. A decrease in the resistance to movement of rolling stock with an increase in the stiffness of the vibration-insulating elements of the upper railway track structure is clearly shown. It was found that, when railway rolling stock with a speed of 60 km/h interacts with a section of the road track having the stiffness reduced by 40% (from 15 to 9 kN/mm), the rolling friction coefficient, the friction force, and the power of the friction force increase proportionally by 78.6%. The pronounced nature of the increase in the values of the friction characteristics is noted in the range of stiffness values of 9–60 kN/mm. A further increase in the stiffness of the vibration-insulating foundation practically does not lead to an additional decrease in the rolling friction coefficient, the friction force, and the power of the friction force, as well as to a significant difference in their values corresponding to different speeds. The practical significance lies in obtaining the stiffness value of the elastic elements of the track foundation that is equal to 60 kN/mm, is sufficient to reduce noise and vibration from the rolling stock, and is maximum in terms of minimizing resistance to movement.

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Correspondence to D. I. Bochkaryov.

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Translated by E. Oborin

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Bochkaryov, D.I., Pranevich, I.I., Lapushkin, A.S. et al. The Influence of Track Foundation Stiffness on the Resistance to Movement of Rolling Stock. J. Frict. Wear 42, 383–390 (2021). https://doi.org/10.3103/S1068366621050020

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  • DOI: https://doi.org/10.3103/S1068366621050020

  • Keywords: upper track structure
  • vibration-insulating element
  • rolling friction coefficient
  • friction force
  • power of friction force
  • stiffness
  • traction calculation