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How to input additional mass at CG of the Model using CONM2
Solution
You can use the Additional Mass options in the 0D Mesh dialog box to specify an
additional mass value to apply to the element to:
Add the mass value to the computed mass value for the bodies or meshes.
Apply the specified mass value instead of using the computed value.
0D Mesh-Create Lumped Mass at Center of Gravity-Additional Mass
Notes