| Autor: |
Mokhtar, M.O.A., Younes, Y.K., El Mahdy, T.H., Attia, N.A. |
| Zdroj: |
Wear; July 1998, Vol. 218 Issue: 2 p172-178, 7p |
| Abstrakt: |
Stick-slip motion is commonly ascribed to a difference between the static and kinetic coefficients of friction and the variation of the frictional forces during the slip periods. The aim of this paper is to present the results of a theoretical analysis, supported by experimental findings, in the form of simple relations showing the effects of different design and operational parameters on the stick-slip motion characteristics. The problem was formulated and solved as an initial value problem using the fourth order Runge-Kutta numerical method during the slip phase. The values of both static and kinetic coefficients of friction were evaluated experimentally. The coefficient of friction during sliding was considered to decrease with the sliding speed in a proposed parabolic form. This form is suggested to be more adequate for dry conformal tribological contacts. Results showed that the natural frequency of the sliding system, the difference between the static and kinetic coefficients of friction and the low drive speed play major roles on the period of the stick times and the motion characteristics. Linear relationships were obtained for the maximum slip displacement and velocity vs. the difference between coefficients of friction (μs− μk(0)) and the drive velocity for different values of natural frequencies. The simplified analyses presented in this work can help the designer to select the proper system parameters in order to minimize the undesirable stick-slip motion at low drive speeds. |
| Databáze: |
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