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3. Monitoring tools
Understanding the following three sections "Monitoring tools", "Diagnostic tools" and "Main faults" requires the reader to have some basic knowledge of mathematics and signal theory. Brief reminders of the minimum requirements are therefore included in .
3.1 Overall levels (NG)
Global level monitoring offers limited investigative possibilities. Overall levels are scalar indicators which are more or less sensitive to a large number of phenomena. On a machine with a relatively high normal vibration level, the development of a mechanical fault may be masked by "background noise". In this case, the overall level measured does not react to the fault, at least not at an early stage in its development....
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Noise and vibration
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Monitoring tools
Diagnostic tools
Bibliography
Software
Main analysis software available :
SENTINEL - (Bruël and Kjaer)
SURVAODIAG - (Steel Diagnostic)
Standardization
International Organization for Standardization (ISO)
- Vibrations mécaniques. Évaluation des vibrations des machines par mesurages sur les parties non tournantes. Partie 1 : Directives générales Partie 2 : Turboalternateurs installés sur fondation radier, excédant 50 MW Partie 3 : Machines industrielles de puissance nominale supérieure à 15 kW et de vitesse nominale entre 120 tr/min et 15 000 tr/min, lorsqu'elles sont...
Appendice
1. Mathematical background
1.1. Vibration: quantification, vocabulary
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Quantification
Like any movement, vibrations recorded during routes can be quantified by three fundamental quantities:
travel ;
the speed of this displacement ;
the acceleration...
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