There are three specific analytical and diagnostic methods to detect vibration faults in gearboxes.
One，Time domain averaging method
The principle is to eliminate noise interference in the detection signal The main points of this method applied to fault analysis are:
① there should be two detection signals, one is the vibration signal, and the other is the time scale signal of the rotation of the rotor shaft;
② smooth filtering;
③ if you need to monitor each gear in the transmission chain, it is necessary to replace the time scale according to the cycle of each gear.
Second, spectrum analysis method
The measured gear acceleration signal spectrum analysis, from the spectrum to see the gear meshing frequency and the amplitude of the harmonics of each order changes, so as to determine the fault.
Vibration analysis and testing-Kunshan Lite-On Testing Instruments
Third, the cepstrum analysis method
Cepstrum method for gear failure side band analysis has a unique superiority, its main feature is that the transmission path is affected by the small, ambiguous information in the power spectrum in the cepstrum is clear, and the cepstrum can be better detected on the power spectrum of the cycle components, so that it is quantitative.
Fourth, other analysis methods
The above methods are commonly used in gearbox fault detection, but only the application of these methods is not enough, this is because the local fault of the gearbox vibration is often short, impulse-type, which changes the amplitude of the vibration signal, but also make the signal phase change abruptly Therefore, we must pay attention to the phase signal, the application of timing models, frequency mediation, and other methods to solve the problem.
