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Speed dependent bearings

I'm excited to see NX Nastran now support speed and/or displacement/force dependent bearings. I have one question about the reference speed of the bearings. If I have two rotors in the model each assigend several bearings, and rotational speed of the 1st rotor is the reference speed. Bearings of the 2nd rotor is speed dependent, then which speed is the reference speed of the 2nd rotor bearings. Is it the reference rotor speed (1st rotor speed) or the 2nd rotor speed?

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Re: Speed dependent bearings

In addition, the helps says that bearings between the rotors (like the concentric rotors in the turbo engine) should be included in both BRGSET of the rotors. Then if these bearings are speed dependent, which speed will they refer to?