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Condition 3:
While in the last band the vibration value is very low, in the first two frequency bands the values are
very high.
Very high probability of gear defect
- wear of teeth,
- change of bite angle as a consequence of wrong correction,
- wrong mutual axis distance of drive and driven shafts,
- misalignment of drive and driven shafts.
All these phenomena increase vibrations in the tooth frequency.
Condition 4:
The last screen shows a case, when the vibration may not be excited by a bearing or a gear. Very
often these are vibrations of the equipment tied to the mentioned machine. In case of multiple-geared
transmissions, however, these can be also the tooth frequencies of the second or third transmission
gear. Here we would not be able to do without a detailed analysis, using an instrument with possibility
of the spectrum analysis measurement.
The measurements on the screen No. 6 can also be used in diagnostics of condition of low-speed
rolling bearings. They usually have larger sizes, and when bearing defects occur, the vibrations are
radiated in the lower frequency ranges. The screens 1 and 2 then cannot be used, since the used
frequency range is identical with the last range on the screen No. 6.
The diagnostics of the low-speed bearing will then be much more successful if we use the lowest
range 0.5 - 16 kHz.
38
Adash 4900 – Vibrio III
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