FRICTION VIEWED AS A RANDOM PROCESS
A stationary cast-iron button sliding against a rotating cast-iron disk generated a time-varying friction signal. The signal was recorded using digital computer data-acquisition techniques. Sixty runs were taken, using different values for various parameters (such as load, velocity, and temperature). The data were analyzed on a digital computer by two different techniques. The first was a time-series analysis: the Fourier transform of each run was taken and the power spectral density of the runs was studied. The second technique was a standard statistical analysis using the Kolmogorov-Smirnov goodness-of-fit test. From the two analyses, some interesting conclusions were made: (1) the friction behaves like a random process; (2) friction may be treated as a constant signal with superimposed white noise; (3) the instantaneous coefficient of friction is normally distributed; (4) friction is influenced by load and velocity; and (5) the mean value and standard deviation are functionally related.
American Society of Mechanical EngineersTwo Park Avenue
New York, NY United States 10016-5990
- Kilburn, R F
- Publication Date: 1973-8
- Features: Figures; References;
- Pagination: 9 p.
- TRT Terms: Friction; Materials science; Stochastic processes; Tribology
- Subject Areas: Data and Information Technology; Railroads;
- Accession Number: 00054341
- Record Type: Publication
- Source Agency: American Society of Mechanical Engineers
- Report/Paper Numbers: 73-LUB-3
- Files: TRIS
- Created Date: Jun 10 1974 12:00AM