Hello everyone, I am new here, and wondering if anyone would have some knowledge on a current problem I have been working on. I am trying to create time- and frequency domain 3D models of an object hanging using a spring from a fixed point within a shell. I am trying to figure out how the vibration of the shell would affect the object inside after the energy transfer through the spring. I would assume multibody-dynamics is the way to go but any input would be highly appreciated. Thanks!