Spectrum Interpretation

The following images are designed to provide typical examples of the vibration spectra that will result from different problems a machine might experience. They are probability based, so field testing should always be performed regardless of how 'sure' you are of the diagnosis.

Remember that any diagnosis made from plot interpretation can be essentially be characterised as an assumption based on an estimate.

Unbalance
Unbalance
Misalignment
Misalignment
Cocked Bearings and Shafts Bent @ Bearing
Cocked Bearings and Shafts Bent @ Bearing
Structural Looseness
Structural Looseness
Bearing Looseness
Bearing Looseness
Housing Distortion: Soft Foot, Piping Stress, etc.
Housing Distortion: Soft Foot, Piping Stress, etc.
Unbalance
Structural Resonance
Unbalance
Critical Speeds
Belt Problems
Belt Problems: Wear, Resonance, etc.
Belt Problems
Belt Problems: Pulley Alignment
Belt Problems
Belt Problems: Eccentric Pulley / Bent Shaft
Sleeve Bearings (Looseness/Rubs)
Sleeve Bearings (Looseness/Rubs)
Oil Whirl
Oil Whirl
Rolling Element Bearings
Rolling Element Bearings
Hydraulic / Aerodynamic
Hydraulic / Aerodynamic
Pump Cavitation / Flow Turbulence
Pump Cavitation / Flow Turbulence
AC Motor Problems:  Broken / Cracked Rotor Bars
AC Motor Problems: Broken / Cracked Rotor Bars
AC Motor Problems: Uneven Air Gap
AC Motor Problems: Uneven Air Gap
AC Motor Problems: Loose Rotor Bars / Windings
AC Motor Problems: Loose Rotor Bars / Windings
DC Motor Problems: Drive Problems
DC Motor Problems: Drive Problems
DC Motor Problems: Speed Fluctuations
DC Motor Problems: Speed Fluctuations
Gear Problems: Misalignment
Gear Problems: Misalignment
Gear Problems: Wear, Eccentricity, Backlash
Gear Problems: Wear, Eccentricity, Backlash

Further Information

For further information, please email enquiries@monition.com or call 01909 722 000. Why not send a link to a colleague or bookmark this page using the links below.

Safecontractor Approved
Institute of Asset Managment Membership
Railway Industry Qualification Scheme
ISO 9001 Registered

Bondhay Complex, Whitwell Common, Worksop, Nottinghamshire, S80 3EH, United Kingdom
Tel: 01909 722000 | Email:enquiries@monition.com | Company Number: 02218477