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Mobius Institute - Vibration Analysis

Mobius - Analysis Definitions

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Vibration Analysis Definitions


A great resource to look up vibration analysis techniques and explanations of diagnoses.


  Unbalance

         Static imbalance

         Couple imbalance

         Dynamic unbalance

         Vertical machines

         Overhung machines

  Misalignment

         Parallel (Offset)

         Angular (Gap)

  Rolling element bearings

         Stage one fault

         Stage two fault

         Stage three fault: outer race

         Stage three fault: inner race

         Stage three fault: ball damage

         Stage four fault

         Cocked bearing: on shaft

         Cocked bearing: in housing

         Fluting EDM

         Rolling elements skidding

         Inner race sliding on shaft

         Outer race loose in housing

  Looseness

         Rotating looseness

         Structural looseness

         Loose pedestal bearings

  Resonance

         Excited by fluting/EDM

         Excited by bearing skidding

  Bent shaft

         Bent Shaft

  Cavitation

         Pump cavitation

  Cocked bearing

         Inner race cocked on shaft

         Outer race cocked in housing

  Journal bearings

         Wear/Clearance

         Oil whirl

  Rotor rub

  Eccentricity

         Eccentricity general comments

         Eccentric motor rotor

         Eccentric motor stator

         Eccentric pulley or sheave

         Eccentric gear

  Hydraulic and aerodynamic

         Blade faults

         Flow turbulence

         Pump cavitation

  Reciprocating machines

  Induction motors

         Type I rotor faults

         Type II rotor faults

         Stator eccentricity or soft foot

         Rotor bow

         Cracked or broken rotor bars

         Loose rotor bars

         Loose rotor

         Loose stator windings

         Shorted laminations

         Loose connections

  Synchronous motors

         Loose stator coils

  DC motors

         General fault comment

         Grounding fault

         SCR Tuning faults

         Phase loss

         Loose connectors, shorted control card and more

         DC motor hunting

  Gearbox

         Gear mesh

         Tooth wear

         Tooth load

         Eccentric gears

         Misaligned gears

         Gear backlash

         Cracked or broken tooth

         Hunting tooth frequency

  Couplings

         Coupling unbalance

         Non-parallel coupling faces

         Coupling wear

         Misaligned 3-jaw coupling

         Locked gearflex coupling

  Belt drives

         Worn belts

         Sheave misalignment

         Belt resonance

  Things you should know

         Warning

         Data Analysis

         Useful facts

         Spectral Ski-slope

         Raised noise floor

         External noise

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