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.