Hello everyone, 

I'm currently working on plotting a Campbell diagram for a flexible rotor in Abaqus. However, it seems that the gyroscopic effects are not being considered, as I'm not seeing the expected frequency splitting into forward and backward modes. Could anyone help me identify if there's an issue with my input file? I've attached the steps for one rotational speed (15,000 RPM). I'm happy to share the full .inp file if needed. thank you in advance.

*************************************************
******    15000 Spin Speed Case
*STEP, NLGEOM=YES, UNSYMM=YES, NAME=Static_15000RPM
*STATIC
1,1,
*DLOAD
ALL, ROTDYNF, 15000, 0,0,0, 0,0,1
*OUTPUT, FIELD, FREQ=99999
*NODE OUTPUT
U
*END STEP
*STEP, NAME=RealFreq_15000RPM
*FREQUENCY, EIGENSOLVER=LANCZOS, SIM, PROPERTY EVALUATION=15000
80,,,-10.
*OUTPUT, FIELD, FREQ=1
*NODE OUTPUT
U
*END STEP
*STEP, UNSYMM=YES, NAME=ComplexFreq_15000RPM
*COMPLEX FREQUENCY, PROPERTY EVALUATION=15000
40,,,
*OUTPUT, FIELD, VARIABLE=PRESELECT
*END STEP
*************************************************