Needle roller bearing solid experimental data of the median and mean, mutation rate and evaluation system

1. Needle roller bearing solid experimental data of the median and mean experimental data of the median and mean as shown in figure 7 7. According to the figure 7 - 7, you can see that with the increase of time, the median increase, and average of different time phase of the median average value can reflect the different stages of time performance of the rolling bearing. Digits, and the average results, the results of the median result is more significant than the average, closer to the rolling bearing performance degradation as a result, the median of rolling bearing vibration data is better than average results. Analysis under the different stages of time rolling bearing vibration performance of mutation rates. 2. Mutation rates under different time phase and injury of different diameter rolling bearing vibration performance of mutation rates as shown in figure 7 8 and 7 - 9. Figure 7 - by 8 and 7 - 9 you can see, when the channel damage 0 mm diameter ( The first phase time) , the mutation rate is very small, only 10%, which indicates that the rolling bearing service performance is in normal state, shows no sign of performance degradation, bearing almost have a chance of failure. When the channel damage diameter of 0. 1778 mm ( The second phase time) , mutation rate increased a lot, to 59%, show that performance of rolling bearing service in abnormal state, performance degrades, bearing failure signs, should pay close attention to the bearing running condition or replace the bearing; When the channel damage diameter of 0. 5334 mm ( The third time stage) Is gradually increasing, the mutation rate, to 74%, abnormal condition show that performance of rolling bearing service gradually intensified, deteriorating performance degradation phenomenon, bearing failure hidden trouble, must stop running, replace the bearings; When the channel damage diameter of 0. 7112 mm ( The fourth phase time) Increases quickly, the mutation rate, to 89%, abnormal condition show that performance of rolling bearing service rapidly increasing, performance degradation phenomenon is deteriorating rapidly, bearing performance failure, almost major safety accident may occur. 3. Assessment system according to the calculated rolling bearing vibration performance degradation assessment system, are shown in table 7 2.