my system has a modal vibration mode 3.1Hz. So i have to chasge system to have a mode higher than 4Hz.
I can't insert a guide because the vibration mode is in a location where i have an huge displacement (a branch at the end of a veery long hot main header).

i thought to use a snubber.

Do i insert snubber only in dynamic input or have i to model both in static input both in dynamic input?