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We can now survey the imported geometry by double clicking 

Internal Components

The internal components of this satellite have been simplified to reduce modal analysis run time.  While this CubeSat structure is simple, larger satellites often have a more complex interior with a wide array of components and structural stiffeners.  Features such as small extrusions, fillets not in contact with the frame and holes may be omitted to reduce the computational load of the simulation.

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For the purposes of this tutorial, the densities for the components are provided (make sure the correct unit kg/m^3 is selected):
Large Box Density = 1000 kg/m^3
Small Box Density = 900 kg/m^3
Cylinder Density = 1200 kg/m^3

Assigning Material to a Component

Now we can apply assign the new material densities to the internal components.  Left click Return to Project > Model to return to the Design Modeler.  Now open up the Geometry drop down list and select "Large Box 1" and "Large Box 2". Right click Material > Assignment > Large Box.

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