Dear Alessandro,
I didn’t review the files you e-mailed me, but I think you are simply misinterpreting the results in the MBC_v1.00.xls (CampbellDiagram.xls) spreadsheet. Here is what I see:
Mode 1, 0.2764 Hz - 1st Tower Side-to-Side Bending
Mode 2, 0.2833 Hz - 1st Tower Fore-Aft Bending
Mode 3, 0.5229 Hz - 1st Blade Flapwise Bending (Regressive)
Mode 4, 0.6138 Hz - Drivetrain Torsion
Mode 5, 0.7505 Hz - 1st Blade Flapwise Bending (Collective)
Mode 6, 0.8980 Hz - 1st Blade Edgewise Bending (Regressive)
Mode 7, 0.9020 Hz - 1st Blade Flapwise Bending (Progressive)
Mode 8, 1.306 Hz - 1st Blade Edgewise Bending (Progressive)
Mode 9, 1.724 Hz - 2nd Blade Flapwise Bending (Regressive)
Mode 10, 2.016 Hz - 2nd Blade Flapwise Bending (Collective)
Mode 11, 2.083 Hz - 2nd Blade Flapwise Bending (Progressive)
Mode 12, 2.356 Hz - 2nd Tower Side-to-Side Bending
Mode 13, 2.403 Hz - 2nd Tower Fore-Aft Bending
Mode 14, 3.630 Hz - 1st Blade Edgewise Bending (Collective)
Mode 15, 6.092 Hz - Nacelle Yaw
See the following post for more guidance on how to interpret the full-system mode shapes resulting from application of a FAST linearization and MBC3: Eigenanalysis FAST.
Best regards,