Prevention of Stick‐Slip Vibrations by Passive Normal Force Control

Abstract

The classical stick‐slip oscillator is extended by an additional degree of freedom which couples the slipping motion to the normal force. Using this, the effective friction force can be altered without changing the friction‐velocity characteristic. The paper deals with the optimization problem of finding parameters of the additional system that prevent stick‐slip motion or minimize the amplitude of the residual limit cycle. Another goal is to increase the decay rate of vibration. Results were achieved by numerical integration based on analytical investigations.

Avoidance of Stick‐Slip Motion by Vibration Control

“…These forces can be generated without external energy using an additional oscillator coupled to the friction oscillator. This design can be seen in figure 1b and has been investigated in [2]. Results from this work show that the additional oscillator has to be tilted from the normal direction of the friction contact by an angle γ against the direction of the velocity of the moving base.…”

Effect of high-frequency excitation on friction induced vibration caused by the combined action of velocity-weakening and mode-coupling

“…Many researchers have discussed various methods of reducing FIV. Use of dynamic vibration absorbers for minimizing FIV is studied in Rudolph and Popp (2003) and Popp and Rudolph (2004). Zinjade and Mallik (2007) studied the effect of the impact damper in suppressing friction-induced oscillation.…”