Ball Joint Connector

The Ball joint component can be used to model ball joints, hinges and universal joints.
The component has zero length, and adds 6 degrees of freedom to the system model.
The forces due to mass and weight are assumed to act at the nodal point at which the component is specified.

The Ball joint component should be used with care at supernodes with user defined boundary
conditions for rotations to avoid singularities in the FEM solution procedure.