Friction in Frequancy Domain Studies

Hi Everybody,

Has anybody applied friction force in a frequancy domain study before? I am trying to apply the friction using the friction subnode under the contact node. However, I am not sure if I do it right.

I use the penalty method for both friction and contact pressure analysis. However, the below error message always appear when trying to run the study.

"The dependent variables comp1.solid.cmX_p1_old, comp1.solid.cmX_p2_old, comp1.solid.cmX_p3_old, comp1.solid.cmX_p4_old, comp1.solid.cmX_p5_old, comp1.solid.cmY_p1_old, comp1.solid.cmY_p2_old, comp1.solid.cmY_p3_old, comp1.solid.cmY_p4_old, comp1.solid.cmY_p5_old, comp1.solid.cmZ_p1_old, comp1.solid.cmZ_p2_old, comp1.solid.cmZ_p3_old, comp1.solid.cmZ_p4_old, comp1.solid.cmZ_p5_old, comp1.solid.contact_p1_old, comp1.solid.contact_p2_old, comp1.solid.contact_p3_old, comp1.solid.contact_p4_old, comp1.solid.contact_p5_old are missing in the segregated solver steps. Add them to existing or new steps.
- Feature: Stationary Solver 1 (sol1/s1)"

Please help,