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Rolling bearing vibration detection

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This industrial training flyer (Rolling bearing vibration detection) is from our CD with 150 Maintenance training flyers on it. …

This industrial training flyer (Rolling bearing vibration detection) is from our CD with 150 Maintenance training flyers on it.
If you want to see what free maintenance flyers might come up in the future, or want to purchase all 150 today, please see the product page below.
http://www.bin95.com/ebooks/CD_contents.htm

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  • 1. Process Plant and Equipment UP-TIME The engineering flyer for plant operators & maintainers that lets them cut time, money & resource waste. From www.feedforward.com.au – Publishers of maintenance & reliability knowledge that cuts time, money & resource waste. Rolling bearing vibration detection A Great Range of Uses Bearing vibration analysis can detect lubrication failures, ABSTRACT misalignment, out of tolerance running, rubbing, improper Rolling bearing vibration detection. Roller bearing vibration gear teeth meshing, out of balance, bent shafts, loose measurement is one of the major condition monitoring tools in regular use. By measuring the velocity, acceleration and components, worn parts, faulty couplings, improper frequencies emitted from a rolling bearing it is possible to tell its operating conditions (like pump cavitation) and deflecting condition and the likelihood of imminent failure. The technology is support structures. However to be able to analyse the well established and well proven but requires a good understanding presence of these type of problems requires a highly skilled of equipment vibration characteristics before a user can draw good person with much experience and exposure to bearing interpretations from the results. Keywords: out of balance, vibration signatures at various stages of failure. vibration analysis, bearing life Mike Sondalini – Equipment Longevity Engineer Method of Bearing Vibration Monitoring Reference: Toward Plant and Equipment Reliability, P. Brown, Industrial All bearings, even those in perfect condition, produce ‘noise’ Training Associates, (www.itatraining.com.au) as the elements roll over the raceways and rub against the internal cage and flanges. This noise is generated at high frequency and low amplitude. The bearing housing amplifies the noise to a point where a sensitive accelerometer can 'hear’ them. By careful detection and filtering, the noise signal can be amplified and represented as a frequency series in real-time. Most bearing faults occur with the rolling elements, cage or raceways. The frequency of the fault has a direct relationship with the geometry of the bearing and the relative speed of each individual raceway. Software libraries of noises for bearings in ideal condition are available for the vast number of bearings. By comparing the actual noise to the ideal bearing signature it is possible to highlight problems with the in-service bearing. The method of presenting the data is either by visually representing it on an oscilloscope screen (monitor screen) as waves or as a number on a digital display. The Four Stages of Bearing Failure A roller bearing progresses through four stages to failure. Vibration analysis permits the monitoring of the bearing’s progression through each stage and to estimate when failure will actually occur. In the case of a raceway failure these would be the four progressive stages. 1. The bearing is new and has no defects. This is the time to record its frequency ‘signature’ and normal operating acceleration and velocity values. 2. If examined at this stage there would be no visible defects. However under the surface of the raceway sub- surface defects have started. The frequency signature has changed, the overall base level noise has risen and the velocity spectrum (graph) has risen higher. 3. At this point the raceway shows visible signs of surface failure. The extent of the failure increases and grows with more metal coming off in minute sheets (delaminating). The velocity spectrum is much higher and much more background noise has developed. Within the background noise particular frequencies start to standout (side bands) and indicate failure is fast approaching. 4. If the bearing is still in service everyone knows it is time to change it out because they can hear it. More vibration frequencies appear and more velocity side bands develop. Readings start to indicate amplitude changes and the noise moves into the range of human hearing. FEED FORWARD PUBLICATIONS, PO Box 578, BENTLEY, West Australia, 6102 Web: www.feedforward.com.au E-mail: info@feedforward.com.au Because the authors, publisher and resellers do not know the context in which the information presented in the flyer is to be used they accept no responsibility for the consequences of using the information contained or implied in any articles.