is vital for mapping natural frequencies against rotational speed to identify potential interference points. Indian Society Of Theoretical and Applied Mechanics Common Failure Mechanisms
A multi-stage centrifugal compressor in a natural gas reinjection plant experienced high vibration levels during commissioning. The vibration was "subsynchronous," meaning it occurred at a frequency lower than the rotational speed. turbomachinery rotordynamics with case studies pdf
3. Case Study: Sub-synchronous Vibration in a Centrifugal Compressor The Problem: is vital for mapping natural frequencies against rotational
Good case studies reference standards. For example, for centrifugal compressors requires that the first critical speed is at least 20% above operating speed (stiff rotor) or below 65% (flexible rotor). A 45-foot vertical pump used for mixing nuclear
A 45-foot vertical pump used for mixing nuclear waste exhibited high-vibration "whirl" problems. Rotordynamic modeling of the segmented shaft system allowed engineers to identify specific coupling and support stiffness issues, correcting the vibration without decommissioning the unit. Liquid Whirl in Labyrinth Seals:
A centrifugal compressor was experiencing high vibration levels, leading to repeated failures of the impeller and shaft. A rotordynamic analysis was performed to identify the root cause of the vibration. The analysis revealed that the shaft's first critical speed was close to the operating speed, leading to resonance and excessive vibration. A redesigned shaft with a higher critical speed was implemented, significantly reducing vibration levels and improving machine reliability.