Node Attributes: Rotational Mass

Description

Assigns rotational mass to selected nodes using three orthogonal principal components and a coordinate system.

Rotational mass attributes are independent of load and freedom cases.

Dialog

Mass X / Y / Z

Three principal components of a rotational mass matrix defined in the selected coordinate system.

Coordinate System

The coordinate system (UCS) in which the principal rotational mass components are defined.

The rotational mass attribute remains associated with the UCS in which it is defined. Subsequent changes to the UCS will change the resulting mass matrix.

In geometric nonlinear analysis, the principal directions of the attribute's mass matrix are not updated.

Common Controls

• Components
• Equation Editor
• Retrieve from model
• Keep selection
• Scale / Add / Delete / Apply

Units

Mass×Length² (e.g., kg.m², lb.in²).

See Also

• Vertex Attributes: Non-structural Mass
• Node Attributes: Translational Mass
• Node Attributes: Non-Structural Mass