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Hello everyone.
I have a question.
On the subject of calculating frequencies of the elements of a bearing.
In the case of pilot bearings, where both raceways rotate at the same time but at different speeds,
and in the same direction of rotation.

I am reviewing this case on a VOITH "Variable-speed turbo couplings" system.
How should the failure frequencies of the 4 bearing elements be calculated? (FTF, BSF, BPFO, BPFI).

What rotational speed should I use for the calculations? ....
I would appreciate your comments. Attached a schematic diagram, to give an idea to my doubts ...


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