Shaft cracks are critical faults in rotating machinery that can lead to catastrophic failure if undetected. Vibration analysis provides a powerful tool for early crack detection during machine operation. Characteristic vibration responses include changes in 1X and 2X amplitude and phase, reduction in critical speed, and internal loop orbit shape [1–3]. In some cases, strong 3X components are also observed as discussed in [4–6]. This article reviews the vibration mechanisms as

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...