How to do force vibration?

Dear Code_Aster experts:

Is there any example that show how to perform force vibration?

Basically, I have a chassis. There are a couple of heavy components
inside the chassis. On top of the chassis, there is a rail where a robot head is mounted to. The robot head moves at high accel/decel speed. I would like to calculate the vibration of the whole thing due to the high speed accel/decel of the robot head.

Is this possible in Code_Aster? How can this be done?

Thanks!

phsieh2005