Self-vibration-induced wear of a friction pair

We study rotational self-excited vibrations of two frictionally coupled disks and consider the case of self-excited vibrations arising in the presence of dry friction, where the disk relative velocity periodically changes sign passing through the point of discontinuity of the friction law. We show that if there are resonances in the system, then undulatory wear arises either on the driving disk or on the driven disks. We find the existence and stability conditions for the corresponding modes.