Bill Bulat
Ansys Employee

Hi,

I just did a test to investigate. A cantilever beam is subjected to a constant 1 m/s^2 base acceleration. In Analysis Settings, I specified that the sweep is over frequency interval [0 Hz < f < 250 Hz] divided into 50 frequency intervals:

 

 

I used a command object to override these settings [100 Hz < f < 250 Hz] divided into 25 frequency intervals):

This is a mode superposition harmonic response analysis (not FULL). The command object appears to have taken precedence (which is, as I understand it, want you want to accomplish):

Kind regards,

Bill