Rolling bearing fault diagnosis method

1. The temperature method determines whether the bearing works normally by monitoring the temperature at the bearing housing (or the housing). Temperature monitoring is sensitive to changes in bearing load, speed and lubrication conditions, especially for bearing overheating caused by poor lubrication. Therefore; it is more effective for this occasion. However, when there are relatively minor faults such as early pitting, spalling, and slight wear on the bearings, temperature monitoring is basically not reflected, and only when the fault reaches a certain severity can this be detected. Therefore, temperature monitoring is not applicable to so-called local damages such as pitting and partial spalling.

2. The oil sample analysis method is a method for judging the bearing condition and failure by taking out the oil sample from the lubricating oil used in the bearing and collecting and analyzing the size and shape of the metal particles in the oil sample. This method is only suitable for oil lubricated bearings and not for grease lubricated bearings. In addition, this method is susceptible to other particles that are not damaged by the bearing. Therefore, this method has great limitations.

3. The vibration method monitors the bearing vibration signal through a vibration sensor installed in the appropriate orientation of the bearing housing or the box, and analyzes and processes the signal to judge the bearing working condition and the fault. Because the vibration method has: ①, suitable for various types of various types of working conditions; ②, can effectively diagnose early minor faults; ③, signal testing and processing is simple and intuitive: ④, reliable diagnostic results, etc., so In practice, it has been widely used. At present, the various rolling bearing test and diagnostic instruments and system towels developed and produced at home and abroad are mostly made according to the principle of vibration method. More than 80% of the literature on bearing monitoring and diagnosis is the vibration method. From the point of view of application, practicality and effectiveness, there is currently no better rolling bearing monitoring and diagnosis method than the vibration method. Closely related to the vibration method is the noise method, which is to judge the fault by the noise of the rolling bearing during operation. Since the noise signal is mixed with a large amount of noise caused by non-bearing causes, it is very difficult to separate the bearing noise from other noises, so this method is used less.

With the continuous development of science and technology, some new monitoring technologies have emerged and applied to the monitoring and diagnosis of rolling bearings, such as acoustic emission technology, fiber optic technology, and so on. However, due to various reasons and limitations, these technologies are really popular for practical rolling bearing diagnostics.