Hello Mr. Karl,

Probably, we have mentioned some of the well-know incipient failures studies. I have been working on bearing faults and crack propagation for four years. If you survey in rotating machinery component faults, you will find more than 50% of failures comes from bearing. Furthermore, bearing has widespread use from small-scale industries to large-scale industries.

Interested reader may review below references,

Article Time–frequency envelope analysis-based sub-band selection an...

Chapter Multi-fault Diagnosis of Roller Bearings Using Support Vecto...

http://rdcu.be/wAeU

Thanks

M M Manjurul Islam