BISOPE series
22- Non-synchronous rotation component vibration defects
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When analyzing the frequency, it is the first step to
distinguish the relationship with the number of revolutions. Among them, harmonics that are compared to
synchronous components and are not calculated as integer multiples of TS
(turning speed) are called asynchronous(Non-synchronous) components. It refers to a frequency
component that is both related to the number of revolutions and has nothing to
do with the number of revolutions at all. Among them, the case related to the
number of revolutions is a frequency generated by rolling bearings, belts,
chains, etc., and is an asynchronous component because it does not fit into an
integer multiple. On the other hand, frequencies that are not related at all to
rotational speed correspond to frequency groups caused by resonance, electrical
faults, fluid excitation, and friction, which are also asynchronous components.
Non Synchronous faults
For patterns and signals of defects whose frequencies are not integer multiples of TS or are not related at all, just look for those that are not related to rotation events. That is, the inner and outer rings of rolling bearings do not fit in integer multiples because they continue to rotate according to a certain pattern formula when the shaft rotates once. Also, in the case of other shafts connected by a belt or in the case of the oil whirl, although it is related to the increase or ......
Observation of asynchronous components is generally not
good.
In particular, frequencies below 1X TS are not normal at all. Oftentimes, it is
a defect in itself. It is important to know how it was in the past and how it
compares to similar machines, but it is important to analyze and find the cause
because it can be a serious matter that needs to be proven through additional
tests.
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