How to hear bearing noise? SAIQ bearings (2)

In this way, can't the SAIQ bearing noise of the on-site equipment be measured and evaluated? Especially from the perspective of equipment maintenance, how should the bearing noise be measured? How to listen?
In fact, it is not without methods.
Because the environmental requirements for noise measurement are relatively high and are more susceptible to interference, in actual failure analysis or equipment operation and maintenance, we usually turn our attention from noise to vibration. In daily SAIQIn the use and maintenance of bearings, if engineers are concerned about the potential failure of bearings, it is more direct and effective to replace the so-called noise measurement with vibration detection methods.
Conversely, if the manufacturer is more concerned about the overall "hearing" of the machine, then a special noise test is still needed.
There is an equal loudness curve in the measurement of hearing noise. An article will be detailed later. Here we first talk about the "noise" measurement method of potential faults.
On-site measurement of "noise" (actually vibration) of potential failures.
First, the most reliable method for vibration testing at present is to use vibration sensors and corresponding analysis equipment. There are many manufacturers of this type of equipment. But generally speaking, time domain and frequency domain methods can be used for detailed analysis to find possible causes of failure. The specific method will involve special condition monitoring knowledge, and other follow-up articles will be carried out.
Secondly, there are many on-site monitoring requirements that are not so detailed. Such as worker inspections. What should I do if there is no vibration monitoring equipment at this time?
The most common inspection method is "listening stick". The same is a sound bar. If the engineer does not understand the reason for using it, he often hears not the real result. As mentioned earlier, even if a "listening stick" is used, we still conduct a "vibration check" instead of a "noise" check.
When listening, hold one end of the sound bar firmly against the monitoring site, and the other end against the outer ear bone of your small ear. In this way, there is a "rigid" connection from the detection site to the ear bone, eliminating the "noise" interference caused by other components. Again, here is "vibration" rather than "noise". Eliminating interference noise from air conduction is a key part of this operation.
Although this method is very commonly used, the details are only based on the difference between "stressing" the action. This detail often determines whether the basis for your judgment is accurate. An experienced engineer can distinguish the abnormality in the bearing from the "vibration" transmitted by the sound bar.
Having mastered the correct on-site "listening noise" method, all subsequent analysis of SAIQ bearing noise and vibration will be more targeted and time-sensitive. Sometimes, on-site engineers exchanged various questions for a long time, and finally found that the main body of everyone was not the same thing. In order to avoid this situation, the small part of "listening" is actually very useful.