Working with ANSYS MASS21 elements

In the ANSYS environment, you can create MASS21 elements in the 0D Mesh dialog box. The MASS21 element is a point-based element that has up to six degrees of freedom: translations in the X, Y, and Z directions and rotations about the X, Y, and Z nodal axes.

Specifying a user-defined coordinate system for MASS21 elements

You can use the Coordinate system reference (KECN) option in the MASS21 physical property table dialog bod to specify a user-defined element coordinate system for MASS21 elements.

The Coordinate system reference (KECN) applies only when you set the following KEYOPTs in the MASS21 ET dialog box:

• KEYOPT(2) Initial element coordinate system (ECS) to (4) ECS is initially parallel to user-defined coordinate system KECN

• KEYOPT(3) Rotary inertia options to (0) 3-D mass with rotary inertia.

Note:

The software does not issue an error message or warning if these KEYOPTs are not set appropriately.

Assigning a material to MASS21 elements

You can assign a material to MASS21 elements and define the material's density.

• In the Mesh Collector dialog box, you can use the Material option to assign a material to the element.

• In the MASS21 physical property table dialog box, you can use the mass and inertia component options to specify the components of concentrated mass and rotational inertia for the element.

To specify a meaningful density for MASS21 elements, you must also create a MASS21ET modeling object and set the KEYOPT (1) Real constant interpretation as option to (1) Volumes and rotary inertias (density).

Note:

Even when you set the KEYOPT (1) Real constant interpretation as option to (1) Volumes and rotary inertias (density), the units of mass and inertia in the MASS21 physical property table dialog box always display as if KEYOPT (1) Real constant interpretation as is set to (0) Masses and rotary inertias. However, the software applies the values you specify in terms of volume.

How do I

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