VARIATION OF CONTACT WHEEL-RAIL FORCES AFTER OVERREACHING CREEP-SLIP ADHESION BOUNDARY

The paper deals with the dynamical analysis of wheel-rail forces occurring in an individual axle-driving system of diesel locomotives under the conditions when the adhesion level is overtaken. The seven degree of freedom-system performs a model where a rigid car body, a bogie frame, primary and secondary suspensions, a resilient wheel and an axle-hung traction motor are considered. For this model the linearized characteristic of the traction motor for the definite speed region and experimentally obtained nonlinear creep-slip characteristics are assumed. The resulting equations of motion were solved for a particular driving system by means of a numerical program on a digital computer. The main influence upon the magnitude of the wheel-rail forces after the transition of the creep-slip point, the slope of slip characteristics, the slope of electric motor characteristics, the value of damping coefficient and the ratio of moments of inertia of the traction motor rotor and the wheelset results. There exists a limiting value of critical damping of an axle-driving system which assures that the magnitudes of the developed wheel-rail forces are negligible and that no self-excited vibrations in the driving system can occur.

Media Info

  • Features: References;
  • Pagination: p. 357-368

Subject/Index Terms

Filing Info

  • Accession Number: 00190299
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: May 26 1979 12:00AM