vibration harmonics on high speed air compressor

dear all

i face with many harmonics of rotational speed on tilting pad bearing of third stage high speed centrifugal air compressor.

phase difference on bearing is 90 degree and stable.filter orbit shows  pre loaded . all other stages are ok. as a maintenance  report , alignment and clearance are ok. after nominal speed(42000 rpm) vibration will be stable and dont  rise up.but the vibration amplitude of bearing alarms.we face to this problems after change and renew impeller of this stage of blade corrosion .

does any one have experience ?

best regards  

 

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