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.
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 ?