Natural Frequencies

[jayar]

I thought I knew how to get the first few harmonics for a body but the results only show the first 5 modes. The way I understand things, the first 6 modes are body modes and not 'real' natural frequencies as we'd like to identify.

[Frederick_Law]

I believe they all multiple of first mode.
I just get first mode higher then machine RPM to avoid harmonic.

[jayar]

I know that the first 6 modes are 'body' modes - not natural frequencies.
Figured out I had to restrain the model to get the natural frequencies but still wondering why I can't see the higher order ones.