Rigid rotation definition
- @RIGID_ROTATION_DEFINITION {
- @RIGID_ROTATION_NAME {RigRotName} {
- @CONNECTED_TO_VERTEX {VertexName}
- @FUNCTION_1D_NAME {Fun1DName}
- @ANGULAR_VELOCITY { ω_{1}, ω_{2}, ω_{3}}
- @BODY_LIST {BodyName1, BodyName2,... BodyNameN}
- @FRAME_NAME {FrameName}
- @COMMENTS {CommentText}
- }
- }
Introduction
The concept of rigid rotation is used in static analysis. In that case, the centrifugal forces associated with the rigid rotation are computed and applied to the system in a quasi-steady manner. Rigid rotations are ignored in dynamic analysis.
NOTES
- The rigid rotation is defined by the components of the angular velocity vector ω = (ω_{1}, ω_{2}, ω_{3}), which is attached to vertex VertexName.
- If no FrameName is defined, the components of the vector are measured in inertial frame F_{I}.
- If the FrameName is defined, the components of the vector are measured in the frame FrameName, that can be a fixed frame or a moving frame.
- The magnitude of the angular velocity vector changes in time according to 1D function, Fun1DName, which must be of type TIME_FUNCTION.
- The bodies undergoing the rigid rotation are specified in the body list. They can be structural elements such as beams, or constraint elements such as revolute joints, for instance.
- It is possible to attach comments to the definition of the object; these comments have no effect on its definition.