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SOL 111. MODAL FREQUENCY RESPONSE

Hi,

I am trying to solve with the SOL 111.MODAL FREQUENCY RESPONSE, but in the nastran window I get an error like the following one.

 

USER FATAL MESSAGE 6683 (FRRD1A)

ALL COMPUTED EXCITATION FREQUENCIES ARE OUTSIDE TE RANGE F1 AND F2 FOR FREQ4 AND/OR FREQ5

 

Can someone tell me how to solve it?

 

thank you very much.

 

Carlos

1 REPLY

Re: SOL 111. MODAL FREQUENCY RESPONSE

Hi Carlos,

 

It looks like there is no natural frequency between your upper and lower excitation frequency limits ?

 

Did you make a modal analysis beforehand to see the natural frequencies of your system ?

 

Akgun