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Vibration Acceleration levels highlight gear problem
Gearbox Out DE vertical acceleration level spectrum
Vibration Analysis shows a gear-meshing problem.
A Gearbox inspection reveals a Gear Tooth Defect
New pinion shaft required but catastrophic failure avoided.
Motor NDE Bearing A
Same position on B Unit
Same position on B Unit
- High overall level
- Cage, Ball Pass & Inner Race Defect frequencies
Same position on B Unit
Same position on B Unit
Same position on B Unit
- Low overall level
- Defect frequencies in noise floor
Pump DE Vibration Displacement showing:
- Slow steady rise in overall vibration levels
- Rise in overall vibration due mainly to vibration at 1x RPM
Pump DE Shaft Orbit showing:
- Large 'circular' orbit
- Shaft instability
Pump DE Shaft Orbit before bearing change.
Pump DE Shaft Orbit after bearing change.
- Significant Noise and Vibration detected in control room
- Generator vibration low until excitation applied
- Unit tripped at 3MW load
Generator DE Vibration Velocity Trend
Generator DE Vibration Velocity Waterfall Plot
- Vibration spike at 1x RPM with excitation applied showed this to be an electrical failure - rewind required.