Non-Trivial High Frequency Effects (Hfe) On Mechanical Oscillators With Non-Linear Dissipation

The present article focuses on some interesting aspects of the effect of high frequency excitation on non-linear dissipative forces, like, non-linear viscous damping, coulomb dry friction damping, Elasto-Plastic dynamic friction. It is shown that non-linear viscous damping as well as friction damping characteristics can be considerably changed by the application of high-frequency excitation. A very useful application of HFE is vibroengine, where a rigid slider is made to move with constant average velocity along a friction surface under the action of high-frequency vibration. A new mechanism of vibroengine is proposed in the article. The proposed vibroengine consists of a rigid slider on a tangentially vibrating friction surface. The movement of the slider is made possible by modulating the normal load between two constant values in an on-off fashion depending upon the time-delayed, measured acceleration signal of the vibrating support.