1. FELT ROLL BEARING DEFECT © Bill Kilbey 2009

2. Background All the peaks up to 20 orders are related to gear mesh from the dryers below this upper felt roll. The roll is 764 RPM Very little acceleration up to 240 3kHz) orders. The bearing felt and sounded “different” so PeakVue data was taken.

3. Acceleration Data

4. Velocity data

5. 3 kHz/240 orders

6. PeakVue 1kHz HP Filter

7. HFD 1-20 kHz

8. PeakVue shows periodic impacts in time waveform of 24 g’s Non-synchronous peak in spectrum 1-20 kHz HFD was almost in fault alarm

9. PeakVue 2 kHz HP

10. Peakvue 5 kHz HP Filter

11. Peakvue 10 kHz HP filter

12. PeakVue 20 kHz HP Filter

13. From the PeakVue data we can see the energy must be concentrated in the 10-20 kHz region The 20 kHx raw data shows the resonance being excited by the inner race defect around 10-12 kHz

14. 20 kHz raw data