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1. Monitoring policies
1.1 Periodic follow-up
Periodic monitoring (or continuous monitoring) of machines, generally as part of a conditional maintenance policy, enables a programmed alarm to be triggered. Depending on the type of fault(s) feared and the complexity of its (or their) detection, this is determined by the choice of an indicator representative of the degradation and by the determination of an amplitude threshold deemed critical, over a defined frequency range.
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The chosen indicator can represent :
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or a physical quantity (displacement, speed or acceleration of the vibratory movement) :
displacement for defects whose vibratory...
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Bibliography
Standards and norms
- Mechanical vibration — Machine vibration measurement and evaluation — Part 1: General guidelines. - ISO 20816-1 - 2016
- Mechanical vibration — Machine vibration measurement and evaluation — Part 2: Gas turbines, steam turbines and fluid-film bearing alternators above 40 MW for land-based applications, with rated operating speeds of 1,500 r/min, 1,800 r/min, 3,000 r/min and 3,600 r/min. - ISO 20816-2 - 2017
- Mechanical...
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