Effects of Slider Mass, Contact Stiffness and Contact Damping on Contact Force of a Single-DOF Contact Slider Model.

Abstract

In this work, we elucidated the effects of slider mass, contact stiffness and contact damping on contact force of a single-DOF contact slider model in wide ranges of the parameter values by means of computer simulation. We found that contact force is mainly related to bounce height so that low bouncing height leads to low contact force. In general, at a larger slider mass the peak of maximum contact force shifts to a lower frequency region with no marked change in the maximum contact force. At the same slider mass, a decrease in contact stiffness can result in a marked decrease in the contact force. However the durability to wear is low because small contact stiffness can actually be realized by reducing contact area. At high contact stiffnesses of 1.5×107 N/m, large contact area can increase durability to wear, although bouncing height is large. In any contact stiffness, we can eliminate the bouncing vibration and suppress contact force by making the slider mass small and the disk surface ultra-smooth. As for the contact damping, an increase in the contact damping ratio has the remarkable effect of suppressing the contact force.