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5. Main defects
This section gives an overview of the main faults and their vibratory manifestations that can be encountered on conventional rotating machines.
5.1 Unbalance (or imbalance)
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Events :
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increase in the overall level selected for low frequencies :
i.e. D c c [10-1,000 Hz],
i.e. V eff [10-1,000 Hz] ;
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clear increase in the amplitude of the fundamental frequency (rotation frequency, fr ) :
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Main defects
Itineraries
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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