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Can you explain what you mean by "I find they haven't been calibrated in years and the levels are significantly incorrect". If the shaft is damaged during operation, this will caused an abnormal reading to the prox. probe, which can indicated this damage as a problem in the other...

Is there onyone has full journal papers about the research on rolling element bearings fault detection. If u know the website pls let me know or u can forward some journal papers via keong96@hotmail.com. Thanks.

Can anyone pls let me know where can i get or download journals and articles about rolling element bearings defect detection from the internet. I really need some reading materials. Thanks.

Thanks for the information. If anyone has information about the relative shaft displacement and bearing housing vibration measurement advantages or their limitation, pls let me know. Thanks.

Thanks for your reply. The measurement of relative shaft displacement is direct and not influence by other vibration sources. As the experimental data analyzed in time domain (timebase plot), only the displacement of the shaft due to bearing faults are identified. If there is other vibration...

The experiments i conducted are measurement of displacement between the shaft surface and the probe tip by using proximity probes. The readings are not taken through REBAM probes that observed the bearing outer ring deflection. The outcome of the experiment proved that the measurement of the...

Can anyone out there explain for me why the bearing defect frequency and its harmonics amplitude decreased with frequency. Thanks.

Can anyone explain for me why the harmonics amplitude decayed when the frequency increased. pls

Actually i have conducted experiments to detect ball and roller bearings fault on the raceways and rolling element via measurement of relative shaft displacement. The results are graphically plotted using timebase plot. The outcome of the experiment showed that positive or negative spikes or...

may anyone pls explain for me about the different between these methods for early fault detection in rolling element bearings. what is the advantages of these methods? thanks

Thanks for your informations electricpete. I will very glad if you can send me the article that u mentioned. Thanks again.

Thanks for your reply. Actually in my experiments, i purposely created an artificial fault on the bearing raceways and rolling element for both ball and roller bearings. The results are presented using an envelope spectrums. The spectrums showed that fundamental spike and its harmonics are...

i have conducected a few experiments to detect rolling element bearings fault using envelope analysis. The envelope sepctrums showed that the fundamental bearing defect frequency and its harmonics are in exponentially decaying in their amplitude. Is there anyone know why this phenomenan happen...