Detection of bearing fault using hybrid digital filter

The signal-to-noise (S/N) ratio is lower and the impulse signal of bearing is difficult to extract when the bearing is operating under heavy environmental conditions. For this reason, a new method is proposed for improving the signal to noise ratio from measurements of bearing vibration by the hybrid digital filter (HDF). Experimental result has shown that these techniques can be made more effective only after HDF has reduced the background noise from the diagnostic signals.