CONDITION MONITORING
W
KeepIng vIBratIon analySIS Happy
ith large numbers of rolling elements in industrial machines, it can be tricky to decipher exactly what is going on inside a unit.
Condition monitors often use accelerometers to measure vibration. With this device, it is possible to differentiate between vibrations by examining the individual frequencies present in the overarching vibration signal. These frequencies can then be used to match to individual parts or certain malfunctions. This analysis can warn of faults well
before failure. In the case of bearings, it is possible to detect excessive rolling element wear or damage due to poor fitting techniques, highlighting the need for bearing replacement. The alternative would be to allow the bearing to deteriorate
Implementing condition monitoring can reduce the frequency and cost of equipment maintenance. Specifically, vibration analysis can provide valuable insight into machine condition, flagging up problems before extensive damage occurs. Here, Chris Johnson, managing director of ball bearing supplier SMB Bearings, explains the steps machine builders should take to reduce the likelihood of bearings being the root cause.
further, which could potentially cause other components to fail. Other problems that vibration analysis can
detect are misalignment, lubricant problems or incorrect shaft or housing fits. With early detection, it may be possible to rectify these issues well before costly bearing failure.
As a safety net, regular vibration analysis
can be used to confirm bearing condition and prevent catastrophic failure. However, if the right precautions are taken to lessen bearing vibration during machine design and bearing selection, the likelihood of faults is greatly reduced.
ExpErt manufacturing
From a bearing manufacturing perspective, a low noise or vibration rating is achieved by paying attention to the surface finish of the raceways and balls, their roundness and selecting the correct cage design. Finely filtered low noise greases can
also be used to reduce vibrations. These contain fewer, small solid particles which can generate noise when they pass between the balls and raceway.
prEvEnt contamination
Accidental dirt or dust contamination can also increase noise and vibration levels, as this inevitably affects the rollability of the bearing. Bearing shields or, even better, contact seals are a good solution to this problem.
32 January/feBruary 2022 | InduStrIal CoMplIanCe
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46
