At the same end of the air compressor, the two vibration measurement points that are 90° apart differ by a factor of 1
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For the air compressor, the two vibration measurement points that are 90° apart at the same end differ by a factor of 2: one reads 63 um and the other 32 um. What could be the reason for this?
Are it the operational data after maintenance and reinstallation, or are they values that have suddenly increased during normal operation?
The displacement measured by the displacement vibration probe is the relative gap, not the absolute gap; therefore, when reading the values, it is necessary to compare them with the data obtained before startup, after installation or maintenance. For example, if after installation or maintenance, at rest, the readings of the two displacement probes are 10um and 25um (please note that these two readings are generally unlikely to be exactly equal), then what needs to be monitored during operation is the difference between the operating readings and these two reference values. Also, where is this seismograph station installed, on what kind of equipment? Is it axial displacement or radial displacement that is being measured?
It gradually increases after running for a while.
Both values are quite high; there seems to be a problem with the watts. Additionally, there may be scratches on the journal.
The probe with a high value is likely to show a false reading; have the instrument check it
The probe is inserted at an angle of 45 degrees from the top; it’s possible to obtain such results as a result of this. In my opinion, since the probe measures displacement, it’s possible that our shaft shifts towards one side of the bearing, which leads to this situation
Amplitude is an alternating quantity and has nothing to do with the original installation clearance; shaft position is a DC quantity, and it is related to the installation clearance.
So how is that traffic volume converted into a numerical value?
Voltage peak-to-peak * Sensor sensitivity