DYNAMIC VEHICLE REACTIONS ON RUCH TYPE S-SHAPED SUPERELEVATION RAMP

The horizontal alignment is often the binding constraint for permissible train speeds. On curves where the horizontal radius is binding, tilting trains may run approximately 25% faster than conventional nontilting trains. However, the lengths of superelevation ramps and transition curves may reduce permissible speeds for both types of trains to lower values than the curve radii. Increasing the lengths of transition curves requires a lateral shift of the track, which may be uneconomical. Hence, the question arises as to whether or not the conventional linear type of superelevation ramp and the clothoid type of transition curve ought to be replaced by smoothed S-shaped superelevation ramps and corresponding types of transition curves. This study evaluated the original and a simplified Ruch type of S-shaped ramps and transition curves. Dynamic vehicle reactions from a power car, a tilting coach, and a nontilting coach were studied. Vehicle reactions were simulated with the computer code GENSYS rather than measured in full-scale tests. Passenger comfort in terms of passenger comfort on curve transitions (P sub CT), vertical wheel/rail forces, guiding forces, track shift forces, and wheel climbing ratios were evaluated according to international draft standards. Roll motions, which may be correlated to motion sickness, were quantified also. Although computer simulations enabled comparisons to be made under controlled circumstances, no substantial advantages were found with the S-shape superelevation ramps.

Language

  • English

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 663-672
  • Monograph Title: COMPUTERS IN RAILWAYS VII
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00800749
  • Record Type: Publication
  • ISBN: 1853128260
  • Contract Numbers: BRPR-CT97-D558, DG 12 HINS, KBN No. 9 T12C 045 1
  • Files: TRIS
  • Created Date: Oct 30 2000 12:00AM