Reason for difference in Modal frequency

Akhil_22546

Hello Community,

I ran a gauge optimization on a model with:

Load Step: Normal modes

Constraint: Frequency for mode 1 between 1280 Hz - 1300 Hz

Objective: Minimize Compliance

It gave a resulting thickness for my component and also the modal frequencies for the first 10 modes.

To verify this I input the thickness in my model and run a Normal modes analysis for the first 10 modes but there is a error of 4% between the values.

Does anyone know a possible reason for this?

Thank you.

GTT Johan

Hi Akhil
Did you run with discrete thickness or did you let the software use floating number for the gauge?

Compare the mass in the two files .out so they are the same!

/johan