HIArray,nthank you for your reply. Yes you´re right, I don´t have that big accelleration that can cause significant inertia forces. But the displacement i have to prescribe is changing over time(sinus-shaped). Is static structure still the right one? How do I manage to import my data to the workbench? I tried with external data but he reads just the first 10 columns and if I link the external data with the model, he takes them as thin surface data but they aren´tn