Rolling bearing fault diagnosis

2019 - rolling bearing fault diagnosis 07 - 15 hony caofeidian port wharf, the way and the key points of rolling bearing fault diagnosis of rolling bearing condition monitoring and fault diagnosis of vibration analysis is practical method. In the practical need to pay attention to choose the location of the measuring point and sampling method. To accurately reflect the real state of rolling bearing vibration, must pay attention to collect accurate signal, so bearing in the nearest place to arrange experiments. In addition must pay attention to many times of the vibration signal acquisition and analysis, comprehensive comparison. To get accurate conclusion. 2, rolling bearing the characteristics of the normal operation of the rolling bearing and practical diagnosis techniques in the process of its use will exhibit strong regularity, and the repeatability is very good. Normal high quality bearing, at the beginning of the use of vibration and noise are relatively small, but there are some scattered of spectrum amplitude is small, may be due to some defects in the process of manufacturing, such as surface caused by burrs, etc. Run after a period of time, maintain a certain level of vibration and noise, frequency spectrum is a single, only one or two times the frequency. More than three times the power frequency spectrum, seldom appears bearing condition is very stable, steady working period. Continue to run into the use of late, after bearing vibration and noise began to increase, sometimes a different sound, but the change of vibration increase is relatively slow, at this point, the bearing kurtosis value began suddenly reaches a certain value. At this point that bearing performance for early failure. At this time, requires that the bearing is closely monitoring, pay close attention to the change. Since then, bearing kurtosis value began falling fast, and is close to normal, and significant increase in vibration and noise, it began to accelerate, increasing when the vibration more than standard, its bearing kurtosis value also began to increase rapidly, when more than vibration standard, and kurtosis value is more than normal, that has entered the late bearing fault, should be timely maintenance equipment, change of rolling bearing. Late show bearing fault feature to severe fault ( For bearing damage, such as holding shaft commonly, burns, sand spallation, raceway, wear beads, etc. ) Most of time is very short, equipment capacity is larger, the faster the speed, the shorter the time interval. Therefore, in the actual fault diagnosis of rolling bearing, once found late fault characteristics, should be decisive judgment is bearing fault, arrange inspection as soon as possible. Spectrum analysis and diagnosis of the rolling bearing in the three, the practical skills with low vibration, bearing the kurtosis is not large, complex vibration signals, spectrum at the scene when the situation is difficult to judge for XXX, the vibration signal acquisition, must be spread to the computer precision analysis. At this point, the conventional analysis first, check the vibration velocity spectrum and bearing kurtosis is close to the standard, various frequency component of the spectrum of observation. If the corresponding frequency spectral line power frequency times, should focus on find fault in the unit structure; For power frequency scores times, appears more small digital frequency, sexual frequency should be focused on looking for bearing, if any, is the existence of bearing fault, if not, exclusion of other parts fault should be cause for alarm, strengthen monitoring. Actually find many not overweight, vibration and bearing failure. Once appear, bearing characteristic frequencies or close to the bearing characteristics of the frequency spectrum, should determine bearing fault, and then according to the size of amplitude, can make trend analysis or arrange maintenance.