❖ Mass Unbalance
❖ Mechanical Looseness
❖ Misalignment
❖ Bearing Damages
❖ Gear Faults
❖ Cavitations
❖ Belt Drive problems
❖ Bent Shaft
❖ Rotor Rub
❖ Hydraulic and Aerodynamic forces
❖ Motor Current Faults
❖ Many Others