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

Abstract

In this work, we elucidated the effects of slider mass, contact stiffness and contact damping on bouncing vibration of a single-DOF contact slider model in wide ranges of the parameter values by means of computer simulation. We found that the bouncing vibration behaviors are governed by the contact resonance frequency and a critical frequency above which the slider downward acceleration is smaller than the wariness acceleration. At a low contact stiffness of 1.5×105 N/m, the bouncing vibration characteristics versus waviness frequency are similar to the forced vibration characteristics of a nonlinear soft spring system. In cases of high contact stiffnesses, 1.5×106 and 1.5×107 N/m, the slider bounces like in an elastic collision. In general, at a larger slider mass the peak of maximum bounce height shifts to a lower frequency region with no marked change in the maximum bounce height. At the same slider mass, a decrease in contact stiffness can result in a marked decrease in the bouncing vibration. In the case of high contact stiffness, we can eliminate the bouncing vibration 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 bouncing vibration.