Friction-induced oscillations of a pin-on-disk slider: analytical and experimental studies

The paper presents coordinated experimental and numerical studies of friction-induced oscillations of a Pin-On-Disk (POD) slider. The primary objective is to verify and expand the understanding of friction-induced vibrations, and to confirm validity of the analytical predictive technology. A special experimental apparatus was built, which possesses desirable qualities of mechanical simplicity and controllable dynamic characteristics. For this apparatus, an analytical model is devised, taking into consideration both the dynamics of the mechanical system and the strongly nonlinear constitutive properties of the contact interface. These properties are determined through asperity-based homogenization approach. By variation of selected details of the apparatus, both stable and unstable configurations of the system were set up and tested. The experimental observations correlate very well with analytical predictions of dynamic instability and of limit cycle oscillations.

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