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 Vibration
Analysis
It is natural for machines to vibrate. Each machine has a level of vibration
that is generated as normal or inherent. However, when machine vibration increases
or becomes excessive, a mechanical problem is usually the cause. Modern instrumentation
for measuring vibration on rotating and reciprocating machinery makes it possible
to detect developing problems, including whether the possible prime cause is
electrical or mechanical.
As well as identifying actual or potential problems we provide solutions including
on-site balancing, machine/coupling laser alignment, and planned maintenance
programmes.
Typically Vibration Analysis, using our trained operator, can identify the following:-
| Most Likely Cause |
Other Possible Causes & Remarks |
| Unbalance |
Eccentric journals,
gears, or pulleys.
Misalignment or bent shaft.
Bad belts.
Resonance.
Reciprocating forces.
Electrical problems. |
| Mechanical Looseness |
Misalignment.
Reciprocating forces.
Resonance.
Bad belts. |
| Misalignment |
Usually a combination
of misalignment and excessive axial clearances. |
| Oil Whirl |
Bad drives belts.
Background vibration.
Sub-harmonic resonance.
“Beat” vibration |
| Electrical Problems |
Common electrical
problems include broken rotor bars, unbalanced phases, unequal air-gap. |
Bad Gears
Aerodynamic Forces
Hydraulic Forces
Reciprocating Forces |
Gear teeth.
Number of Fan blades.
Number of Impeller vanes. |
| Bad Anti-friction
bearings |
Bearing vibration
may be unsteady.
Cavitation, recirculation, and flow turbulence cause random high frequency
vibration.
Improper lubrication of journal bearings.
Rubbing. |
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