Rigid body mass definition

@RIGID_BODY_MASS_DEFINITION {
@RIGID_BODY_MASS_NAME {RbmName} {
@VERTEX_NAME {VertexName}
@MASS_PROPERTY_NAME {MassPropName}
@SHAPE_NAME {ShapeName}
@GRAPHICAL_PARAMETERS_NAME {GrfParamName}
@COMMENTS {CommentText}
}
}

NOTES

  1. A rigid body mass is a structural element with infinite stiffness, which is associated with a vertex, VertexName.
  2. Figure 1. Configuration of the rigid body.
  3. The geometry of the rigid body mass is depicted in fig 1. It is inherited from vertex VertexName, which must have an associated triad, TriadName. A local coordinate system is attached to the rigid body mass: its origin is at point, PointName, which is associated with vertex VertexName and its orientation coincides with that of the triad, TriadName.
  4. In fig. 1, point PointName is denoted B and the orientation of triad TriadName is represented by unit vectors e1, e2, and e3.
  5. The mass properties, MassPropName define the inertial characteristics of the rigid body mass, and are defined in the local coordinate system.
  6. An external shape, ShapeName can be optionally defined for the rigid body mass. This external shape is exclusively used in the visualization post-processor and has no effect on the analysis procedure.
  7. It is possible to attach comments to the definition of the object; these comments have no effect on its definition.

Graphical parameters

  1. The appearance of the rigid body mass during the visualization phase of the analysis can be controlled by associating graphical parameters GrfParamName to the element.
  2. The following representations are valid for rigid body masses: RepresentationType = MESH, SURFACE, SYMBOL or TRIAD. The TRIAD representation depicts the rigid body mass with a triad. The SYMBOL representation depicts the rigid body mass as a box symbol. The other two representations are allowed only if a shape ShapeName is defined for the rigid body mass; SURFACE shows the shape as an outer surface of the body, and MESH depicts the shape as an orthogonal mesh of curves. Default value: SURFACE if a ShapeName is defined, SYMBOL otherwise.
  3. It is possible to attach comments to the definition of the object; these comments have no effect on its definition.

Sensors

  1. Sensors can be defined to extract information about rigid body masses. The following SensorType and associated FrameName specifications are allowed for rigid body masses: ACCELERATIONS, DISPLACEMENTS, POSITIONS, and VELOCITIES. (Default value: DISPLACEMENTS).
  2. No u value or v value are accepted for flexible joints.