Sliding velocity dependence of kinetic friction coefficient of bronze-filled polytetrafluoroethylene and its application to robustness improvement of friction damper

Abstract

This study demonstrates that the robustness of friction dampers can be enhanced by using the positive velocity dependence of the kinetic friction force. First, we show that the kinetic friction coefficient can be reduced under extremely low sliding velocity conditions by using oleyl acid phosphate (OLAP) as an additive to the lubricant on the sliding surfaces between bronze-filled polytetrafluoroethylene (PTFE) and steel. Next, based on the results of the numerical simulations, we show that the use of a sliding surface with a positive velocity dependence of the friction coefficient is effective in improving the vibration reduction ability of the friction dampers. Finally, our findings are demonstrated through a simplified experiment.