Flexible joint definition

@EDGE_NAME {EdgeName}
@COMMENTS {CommentText}


  1. A flexible joint consists of a set of concentrated springs and dampers that is associated with an edge, EdgeName, used for the representation of multibody systems.
  2. The geometry of the flexible joint is inherited from edge, EdgeName, which must have an associated triad, TriadName.
  3. The stiffness matrix, D* of the joint is defined in the flexible joint properties, FlxPropName. The 6 × 6 stiffness matrix is fully populated, allowing the modeling of the various rectilinear and torsional stiffnesses, as well as potential elastic couplings. These physical properties are defined with respect to the local triad, TriadName.
  4. It is possible to attach comments to the definition of the object; these comments have no effect on its definition.

Graphical parameters

The appearance of the flexible joint during the visualization phase of the analysis can be controlled by associating graphical parameters, GrfParamName to the element. The following representations are valid for flexible joint elements: RprType = SYMBOL or TRIAD. The TRIAD representation depicts the flexible joint with a triad. The SYMBOL representation depicts the flexible joint as a box symbol. Default value: TRIAD. No vector fields are valid for flexible joint elements.


  1. Sensors can be defined to extract information about flexible joints. The following SensorType and associated FrameName specifications are allowed for flexible joints: ACCELERATIONS_0, ACCELERATIONS_1, DISPLACEMENTS_0, DISPLACEMENTS_1, POSITIONS_0, POSITIONS_1, VELOCITIES_0, and VELOCITIES_1. (Default value: DISPLACEMENTS).
  2. No u value or v value are accepted for flexible joints.