Rotating assemblies of turbomachinery, foil journal bearing assemblies thereof, and methods for producing journals of the foil journal bearing assemblies

A foil journal bearing assembly comprising:

• an annular bearing carrier;
• an annular bearing sleeve disposed within the annular bearing carrier and attached thereto, the annular bearing sleeve lined with a plurality of foils;
• a journal having an outer surface that engages the foils, the journal adapted to rotate in close clearance relationship within the annular bearing sleeve for operation over a range of temperatures and speeds;
• and
• wherein the journal is configured to at least one of the following:
• resist operational deflection thereof and reduce the effects of journal misalignment.

A method for producing a journal of a foil journal bearing assembly for a rotating assembly, the method comprising the steps of:

• determining expected operational deflection of the journal under predetermined operation conditions;
• determining whether there is static or expected operational journal misalignment;
• and
• at least one of the following:
• configuring the journal to resist the expected operational deflection and configuring the journal to reduce the effects of journal misalignment.