MEASURING WHEEL FOR MEASUREMENT OF TRANSVERSE FORCES EXCHANGED BETWEEN RAIL AND WHEEL

On Indian Railways transverse forces between the rail and the wheel are measured at axle box level by means of load cells. For direct measurement of transverse forces at rail level, "measuring wheel" technique has been recently developed. The development involves identification of locations on the wheel disc which are least sensitive to the vertical load variations. Identification of these locations has been carried out on a specially designed calibrating rig. The straingauges are fixed at the identified locations to form wheatstone bridge. For the prevailing operating speeds on Indian Railways, six straingauge locations each 60 deg apart have been found adequate for continuous measurement of transverse forces. Final calibration is carried out on the rig by studying the strain output pattern of the bridge formed for one complete revolution under the combined effect of both vertical and transverse loads of varying magnitudes. For transmission of signals produced by the rotating measuring wheel to the recording instruments in the Oscillograph Car, wireless has been found effective and reliable. System consists of a low frequency, frequency modulated oscillator, signal receiving coil hung from the under-frame and low frequency, frequency modulated discriminator and other recording instruments. Extensive field trials have been conducted with the measuring wheel fitted under a 4-wheel freight car and based on the results relationship between the flange force by measuring wheel and the transverse force at axle box level has been arrived at. This relationship is found independent or the track geometry and its parameters. Further work on the development of a measuring wheel for 18.8 t axle load wheel set used under diesel-electric locomotives is in progress; both vertical and lateral forces will be measured.

  • Corporate Authors:

    International Railway Congress Association

    17-21 rue de Louvrain
    1000 Brussels,   Belgium 
  • Authors:
    • Tayal, H P
  • Publication Date: 1980-7

Media Info

  • Features: Figures;
  • Pagination: p. 461-466
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00323204
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 19 1981 12:00AM