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Natural Frequencies

Posted: Wed Mar 10, 2021 2:27 am
by 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.

Re: Natural Frequencies

Posted: Wed Mar 10, 2021 2:50 pm
by Frederick_Law
I believe they all multiple of first mode.
I just get first mode higher then machine RPM to avoid harmonic.

Re: Natural Frequencies

Posted: Sat Mar 20, 2021 5:33 am
by 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.