Effect of Tangential Dither Signal on Friction Induced Oscillations in the SDOF Model

This work examines how friction-induced oscillations are affected by high-frequency excitations, commonly referred to as dither signals. The traditional mass-on-moving-belt system is studied using two different friction models, both exhibiting a negative friction coefficient-velocity relationship. The method of averaging is implemented and compared with numerical simulations. It is shown that there is qualitative agreement between the two approaches, but there are significant quantitative differences. This study also demonstrates how tangential dither is capable of suppressing friction-induced oscillations in many cases. However, it is also shown that dither can destabilize an initially stable system in some circumstances.Copyright © 2005 by ASME