Response spectrum analysis studies support the application of remote
masses.
You can include the effect of a component's mass
that is not part of the meshed geometry to the rest of the model by treating it as a
remote mass. To apply a remote mass to a model for which you want to run a response
spectrum analysis, from the simulation study tree, right-click External Loads, and select Remote Mass
. Specify the location of the remote
mass at the component's center of gravity. The remote mass is rigidly connected to the
rest of the model at the selected faces, edges, or vertices.