Cepstrum Analysis

Some machines, such as gear boxes, produce very complicated spectrum signatures. The cepstrum analysis offers a way to simplify the analysis, of these signals.

When trying to diagnose a vibration signal in order to identify possible faults in the machine, the following are investigated:

• Harmonic relations,
• Presence of sidebands,
• The relation of energy in different side band and harmonic families.
  
  

The cepstrum analysis

• Simplifies the analysis of a complicated spectrum, and
• Is independent of the signal path.