RESEARCH PAPERS: Design Engineering Papers

Fatigue Damage of the Locomotive Suspension Elements Under Random Loading

[+] Author and Article Information
D. S. Garivaltis, V. K. Garg

Dynamics Research Division, Association of American Railroads, Chicago, Ill.

A. F. D’Souza

Department of Mechanics, Mechanical and Aerospace Engineering, Illinois Institute of Technology, Chicago, Ill.

J. Mech. Des 103(4), 871-880 (Oct 01, 1981) (10 pages) doi:10.1115/1.3255000 History: Received June 01, 1980; Online November 17, 2009


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.

Copyright © 1981 by ASME
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