Vibration Monitoring
Overall Vibration
Unbalance Misalignment Gear problems Bearing Problems Looseness…
ISO 2372/10816
mm/s RMS
10-1000 Hz
Trending Overall Vibration Vibration severity
+ 4 steps
+ 3 steps
+ 2 steps
+ 1 step
Normal
Breakdown
Vibration measurement
(Shutdown) Effect repairs
Report dangerous increase
Plan major overhaul
Report large increase
Report change
Inspection, minor repairs Routine maintenance (lubrication, etc.)
Maintenance activities
Increase in Overall Vibration… • One or more of: – Unbalance – Misalignment – Gear problems – Bearing Problems – Looseness…
Vibration Analysis
Mechanical fault Frequencies
Value of Symptom parameter mm/s
v4 Symptoms as VALUE or COND
v1
v3 v5 v2 v6
v7 Hz
Broad band RMS-value =
v f
2 f
Symptom RMS-value = v2 +v2 +v2 +v2 v2 v2 2 1 2 3 4 + 5 + 6 +v7
Machine faults identified Machines
Faults
• • • • • • •
• • • • • • •
Motors Generators Pumps Compressors Fans & Blowers Gear Box Turbines…
Unbalance Misalignment Bearing problems Gear problems Belt problems Looseness Eccentricity…