An experimental study on voltage-controlled friction of alumina/brass couples in zinc stearate/water suspension

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)567-574
Journal / PublicationTribology Transactions
Issue number4
Publication statusPublished - Oct 2001


Dependence of the friction coefficient of Al2O3/Cu couples lubricated with a zinc stearate suspension on external voltage has been investigated on a ball-on-disc rotation type and a pin-on-plate reciprocating motion type test device. Both of the ball-on-disc and pin-on-plate test results showed that friction coefficient increased remarkably when a voltage greater than certain critical value was applied, and it decayed to ordinary levels as the voltage was removed. Active control of friction coefficient of Al2O3/Cu rubbing couple was attempted in two demonstrational cases. In the first case, the real friction coefficient was timed to follow a pre-assigned step-up change in the real-time of rubbing process by adjusting the applied external voltage with a simple feedback control scheme. In the second case, friction coefficient was controlled to yield to a pre-assigned sinusoidal variation with the same control algorithm. Test results have shown that the actual friction coefficient can approach its goal values in both cases within accuracy of 3% if control parameters are proper. Experiments with various control parameters have indicated that improper control parameters lead to slow convergence and even oscillation.

Research Area(s)

  • Ceramics, Control, Friction, Metals, Suspension