Rotating machines

The purpose of performing a diagnosis on rotating machines is to ascertain the condition of the equipment, to assess the seriousness of the faults detected, to determine their origin and to recommend targeted corrective actions.

This is a one-off exercise, which can be triggered to take delivery of a new piece of equipment and to establish a benchmark, before a scheduled shutdown to arrange for maintenance work to be done or when there is an alarm, an abnormal noise or faults affecting production.

There are primarily three types of investigation tools used: firstly the vibratory analysis of the bearings on the drive shaft, secondly the analysis of the relative vibrations of the shaft in its bearings (plain bearings), and in addition, the electrical signature of the motor or alternator current.

A programme of specific tests is established depending on the context and the problem:
It always comprises the vibratory and electrical signature for various load conditions and sometimes the recording of the start and stop phases as well as the natural frequency measurements on shafts and bearings.

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