Subsynchronous rub simulated in rotor kit with rubbing screw Rubbing occurs when rotating machine parts come into contact with stationary components. It is one of the most frequent malfunctions in rotating machinery, yet remains difficult to diagnose because vibration responses may appear as subsynchronous, synchronous, or supersynchronous (including harmonics). Accurate diagnosis requires a clear understanding of vibration characteristics, machine configuration, and dynamic

This article explains how to determine cause of journal bearing damage with erosion pattern as shown above. Introduction: As a machinery...