INVESTIGATION OF THE PHENOMENA OF FRICTION INDUCED VIBRATIONS IN SMALL-SCALE MECHANICAL SYSTEMS

摘要

This paper presents the experimental investigation of the concept of friction-induced vibrations observed in small-scale mechanical systems. A mesoscopic flat-on-flat tribotester, simulating as close as possible the behaviour of a microfluidic device, was designed and built and sliding tests on polyamide materials sliding on steel were performed in ambient atmosphere using this mesoscopic flat-on-flat tribotester. The results of this investigation show that these phenomena can also occur in small-scale system as it occurs in macro-scale system. This concept is due to: the interaction between mechanical parameters and tribological properties of the two sliding surfaces and the existence of two friction: static and kinetic friction so that the transition from one to another can be accompanied with vibrations. The results of this investigation confirm also the general trends that: stick-slip vibrations occur generally at lower sliding velocity and quasi-harmonic vibrations at higher sliding velocity.