FATIGUE DAMAGE OF THE LOCOMOTIVE SUSPENSION ELEMENTS UNDER RANDOM LOADING

Spectral analysis techniques are employed to analyze the fatigue damage to the suspension of a six axle locomotive on tangent track with vertical and lateral random track irregularities. The locomotive is represented by a thirty-nine (39) degrees of freedom linear model. Spectral densities of forces and probability density functions for stress levels in suspension elements are generated. Using a modified definition of transmissibility, the probability density functions of the output/input and mean square values of outputs are obtained for various stiffness ratios. A cumulative linear damage criterion based on Miner's theory is employed to predict fractional damage per operational second and mean life of the suspension elements. Operational stress cycles/sec. versus operational stress level are plotted for the suspension elements. These operational characteristics in conjunction with fatigue characteristics (S-N curve) can be effectively used as a tool for fatigue design.

  • Supplemental Notes:
    • Contributed by the Design Engineering Division for presentation at the Winter Annual Meeting, Chicago, Illinois, November 16-21, 1980 of the American Society of Mechanical Engineers.
  • Corporate Authors:

    American Society of Mechanical Engineers

    Two Park Avenue
    New York, NY  USA  10016-5990
  • Authors:
    • Garivaltis, D S
    • Garg, V K
    • D'SOUZA, A F
  • Publication Date: 1980-6

Media Info

  • Features: Appendices; Figures; References;
  • Pagination: 10 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00325427
  • Record Type: Publication
  • Report/Paper Numbers: 80-WA/DE-7 Conf Paper
  • Files: TRIS
  • Created Date: Feb 6 1981 12:00AM