Overview
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Read this article from a comprehensive knowledge base, updated and supplemented with articles reviewed by scientific committees.
Read the articleAUTHOR
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Alain BOULENGER: Former head of maintenance and vibration diagnostics at AIF, then SKF
INTRODUCTION
All machines in operation generate vibrations. Because vibration is representative of the dynamic forces generated by moving parts, it occupies a privileged position among the parameters to be taken into consideration to ensure effective monitoring of machine operation. This is all the more the case as any change in a machine's vibration "signature" is often the first physical sign of an anomaly, and a potential cause, in the more or less long term, of a breakdown or deterioration detrimental either to production, the quality of the finished product, or the safety of personnel.
These particularities make vibration analysis, whether by periodically monitoring the evolution of a selected indicator (or set of indicators) until an alarm threshold is exceeded, or by establishing a diagnosis ruling on the nature and severity of a failure and the urgency of intervention, one of the main tools for preventing breakdowns and studying how they occur.
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Condition-based maintenance using vibration analysis
Standardization
Association française de normalisation AFNOR
NFE 90 300 May 1978 Mechanical vibration of machines with a rotation frequency between 10 and 200 per second. Basis for the development of assessment standards.
International Organization for Standardization ISO
Notion of cepstrum
1. Definition
There are generally two definitions of cepstrum.
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The first, particularly appropriate for vibratory signals, defines it as the inverse Fourier transform of the decimal logarithm of its direct Fourier transform (complex spectrum):
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