Planar joint definition

@EDGE_NAME {EdgeName}
@COMMENTS {CommentText}


  1. A planar joint is a constraint element that allows the relative displacement of two bodies in a specific body attached plane, together with relative rotation about an axis normal to this plane, see fig. 1. The planar joint is a holonomic constraint element that is associated with an edge, EdgeName. Vertices Vertex0Name and Vertex1Name are associated with this edge. Find more information about: the representation of multibody systems, and the formulation of constraints in multibody systems.
  2. Figure 1. Configuration of a planar joint.
  3. The geometry of the planar joint is inherited from edge, EdgeName, which must have an associated triad, TriadName. Relative rotation of the two bodies is allowed about the third axis of this triad only. Relative displacements of the two bodies are allowed in the plane normal to the third axis of this triad only.
  4. The clearance properties, ClrModlName of the joint can be optionally specified. This allows the definition of contact or lubrication between body k and body l.
  5. The relative rotation element, RvrName, gives access to the relative rotation, Φ, at the planar joint.
  6. The relative displacement elements, PruName1 and PruName2, give access to the relative displacements, Δ1 and Δ2, respectively, at the planar joint.
  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 planar joint 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 planar joints: RprType = SYMBOL or TRIAD. The SYMBOL representation depicts the planar joint as a symbol centered at the point that defined the element. The TRIAD representation depicts the planar joint as two triads sharing a common origin and oriented according to the configuration of the two bodies connected to the joint. Default value: SYMBOL. No vector fields can be associated with planar joints.


  1. Sensors can be defined to extract information about planar joints. The following SensorType and associated FrameName specifications are allowed for planar joints: ACCELERATIONS_0, ACCELERATIONS_1, DISPLACEMENTS_0, DISPLACEMENTS_1, CONFIGURATION_0, CONFIGURATION_1, VELOCITIES_0, and VELOCITIES_1. (Default value: DISPLACEMENTS_0).
  2. No u value or v value are accepted for planar joints.