Mnemonic for rolling bearing fault diagnosis

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For the rolling elements in the inner and outer rings, keep the characteristic frequencies in mind. If there is indeed a bearing fault, the frequency components cannot be hidden. First, examine the low-frequency part of the spectrum to check for any asynchronous components; if such components are present, the fault can be identified with certainty. The presence of harmonic frequencies corresponding to the characteristic frequencies indicates an undoubted fault. Next, look at the high-frequency part of the spectrum – the presence of modulation signals points clearly to a fault. A change in the characteristic frequency of the outer ring suggests looseness, while a change in the inner ring’s frequency can also serve as evidence of a fault. In special cases, a careful analysis is needed to accurately diagnose the fault. If only a single frequency is present, it’s necessary to determine whether it relates to a bearing issue. High frequencies are also important, as they indicate early-stage faults. If there are no high frequencies but only low frequencies, continuous monitoring is essential. If the damage is severe, high-frequency signals may show signs of voids within the bearing; it’s better to replace it promptly rather than taking chances, in order to avoid accidents. Understanding the mechanism behind the fault helps to distinguish between right and wrong. Regularly check the lubrication condition, and never slack off in terms of tuning and assembly. There are tricks to diagnosing bearings, and trusting science ensures accuracy. ——Reposted