Defining inertia

Point mass/inertia. You can define lumped mass and rotary inertia at a point on a part or on an assembly. You can also define mass and inertia proportional damping. In an Abaqus/Standard analysis, you can define composite damping. For more information, see Point masses, and Rotary inertia.
Nonstructural mass. You can define nonstructural mass for a region on a part or on an assembly. For more information, see Nonstructural mass definition.
Heat capacitance. You can define concentrated heat capacitance at a point on a part or on an assembly. For more information, see Point capacitance.

Select SpecialInertiaCreate: type from the main menu bar in the Property module or the Interaction module to define inertia. Select Edit from the same menu to make changes to an existing definition.

Inertia definitions appear in the Model Tree in the Engineering Features container under the part (if created in the Property module) or under the assembly (if created in the Interaction module).

When you define inertia, you can select objects from the viewport to identify the region on which to apply the inertia. By default, a set or surface is created that contains the selected objects. You can change this behavior by toggling off the option to create a set or surface in the prompt area. A default name is provided in the prompt area, but you can enter a new name.

When you apply inertia to regions of the model, you can choose to display symbols in the viewport that indicate where you have applied the inertia. If you apply inertia to geometry, symbols appear at the vertices. If you apply inertia to an orphan mesh, symbols appear at the nodes. For information about graphical symbol types, see Symbols used to represent special engineering features. For information about controlling the visibility of these symbols, see Controlling the display of attributes.

For detailed instructions on creating this type of engineering feature, see the following sections: