Unbalance is the uneven distribution of mass above a shaft’s rotating center line. The centrifugal forces caused by unbalance, exerts high dynamic forces on the bearings and machine components reducing their lifetime.
Unbalance causes:
- Deposit built up
- Corrosion and erosion of fan blades
- Thermal affect: non uniform expansion in the fan
- Low speed balancing practices
- Machining and welding errors
Main Detectable issues
- Unbalance weight location
- Rotor sensitivity to unbalance
- Critical speeds & resonance
- Other problems excited by unbalance
- Low vibration
- Low noise
- Increased efficiency & uptime
- Increased operator safety
- Increased productivity
- Increased bearing life
- Reduced structural stress
- Reduced operating cost