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2. Tools
2.1 Vibration level monitoring of indicators (overall levels)
Provided that the measurements have been taken either on different frequency bands, or according to different indicators which are themselves more sensitive to different frequencies, it is possible, by looking at the evolution of the levels of these different parameters in a comparative way, to get an idea of the families of faults responsible for machine vibration and, possibly, to orientate research for further analysis (table 1).
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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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