Summary:...
Gear is an important part of the gearbox. As a transmission mechanism, the gearbox is widely used by various mechanical equipment. The working condition of the gearbox directly affects the policy operation of the entire machine. The damage to the machine caused by the failure accounts for a large proportion.
Statistical data on the actual effectiveness of gears on parts of
planetary gearbox show that the proportion of failures of gears and bearings is the largest. Therefore, in terms of fault diagnosis of gearboxes, the focus is on the failure mechanism and diagnosis methods of gears and bearings.
The research on gear fault diagnosis first started in the early 1970s. There are roughly two types of diagnosis methods. One is based on the principle of friction and wear, which is to diagnose the condition of the gears in the gearbox by studying and analyzing the wear debris in the lubricating oil of the gearbox. The other type is diagnosis through the processing and analysis of dynamic signals in gear operation.
Under the premise of correctly obtaining the dynamic signal of the gearbox, choosing an effective signal processing method is the key to the success or failure of the diagnosis and to improve the sensitivity of the diagnosis. The dynamic signal of the gearbox is the carrier of its operating state information, and the task of signal analysis is to extract useful information from the carrier to provide a basis for diagnosis. As with gears, many of the methods used for gear diagnosis can be used for bearing fault diagnosis, and there are a few other effective methods.
In the actual operation of the machine, the gearbox is a unity with the coexistence of gears and bearings. The vibrations caused by the deformation of the gears and bearings of the gearbox, machining errors or intentional reasons are transmitted to the sensor through their respective channels. Due to the mutual correlation, the signal composed of various parts that affect each other cannot be regarded as a simple superposition of each part, and how to separate them. Identifying different fault sources and how to provide the sensitivity and reliability of diagnosis play an important role in the research of gearbox faults, because these factors have more practical value for the promotion and application of gearbox fault diagnosis technology in engineering practice.
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