Wavelet Analysis and Envelope Detection For Rolling Element Bearing Fault Diagnosis-Their Effectiveness an Flexibilities

摘要

The components which often fail in a rolling element bearing are the outer-race, the inner-race, the rollers, and the cage. Such failures generate a series of impact vibrations in short time intervals, which occur at Bearing Characteristic Frequencies (BCF). Since BCF contain very little energy, and are usually overwhelmed by noise and higher levels Of macro-structural vibrations, they are difficult to find in their frequency spectra when Using the common technique of Fast Fourier Transforms (FFT).