When running a random vibration model, the solver appears to only consider the first 15 frequencies, even though I have the following setting in properties:

Frequency Options, upper bound frequency =2000 (the number of frequencies button is blank and the default number 15 is grayed out.

Random Vibration options, upper limit = 2000, number of points =3

During the frequency solving, the software identies 173 frequencies. But when I solve for the stresses, the number of steps is 49, which I think is due to the software considering that there are 15 frequencies. That is 49 steps = 15*3 + 4. I suspect this because when I have the number of points set at 2, the number of steps is 34, which I think is 15*2 + 4.

Anyway, I was hoping to get some help here, since I think the software is only using the first 15 natural frequencies. I've checked all the other settings but can't seem to locate anything.

Maybe I have to update something?

Thanks, Dave

Also, when right clicking on the study and then "Details," I notice that the number of modes = 15, yet I have the "Number of Frequencies" button under Frequency Options turned off, and as I mentioned above, the software actually calculates 173 natural frequencies.