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.
- 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.
American Society of Mechanical EngineersTwo Park Avenue
New York, NY USA 10016-5990
- Garivaltis, D S
- Garg, V K
- D'SOUZA, A F
- Publication Date: 1980-6
- Features: Appendices; Figures; References;
- Pagination: 10 p.
- TRT Terms: Defects; Dynamic tests; Life cycle analysis; Locomotives; Power spectra; Railroad tracks; Suspension systems; Train track dynamics; Vehicle design
- Non-Preferred Terms: Power spectral density; Spectral density; Spectral energy distribution
- Uncontrolled Terms: Dynamic analysis; Fatigue analysis
- Old TRIS Terms: Locomotive design; Six axle locomotives; Track irregularities
- Subject Areas: Design; Railroads; Vehicles and Equipment;
- Accession Number: 00325427
- Record Type: Publication
- Report/Paper Numbers: 80-WA/DE-7 Conf Paper
- Files: TRIS
- Created Date: Feb 6 1981 12:00AM