Learning Forum

[axel.guillou]

Hello,

I am doing a modal analysis of a box support. To maintain the right structure stiffness, I need to keep the box in my model. I cannot use point mass as it makes it too rigid or too flexible depending on the behavior choice.

The box generates a lot of specific vibration modes but I would like to distinguish the support modes. 

I have heard about condensed geometry and I would like to know is it is possible to condense the box for the modal analysis in order to keep its stiffness ? If yes, what parameter should I use in my condensed geometry ?

Thank you!

[dlooman]

What you describe sounds like a superelement, which is referred to as a Condensed Part in Mechanical.  In recent releases this is a fully supported capability in Mechanical.  You can right click on Model at the top of the tree and insert Condensed Geometry.  Then right click on Condensed Geometry and insert Condensed Part.  After scoping the Condensed Part to some geometry you can right click on it again and Detect Condensed Part Interface and Generate Condensed Parts.  All the places where the box connects to the support frame will become master degrees of freedom of the superelement.