Ansys Learning Forum Forums Discuss Simulation General Mechanical Generation of constraint equation issues Reply To: Generation of constraint equation issues

dlooman
Ansys Employee

By giving the mass21 a small rotational inertia in all directions, the master node will have all 6 dof.  Then CERIG,master node, all,all should write constraint equations for all the selected nodes in terms of the master node ux, uy, uz, rotx, roty, rotz.  You should confirm this before leaving APDL with celist.  Because the master node dof are retained they can all be used as the master dof of a superelement.  I don't know what the error message means, but you could avoid the issue by defining the mass in Mechanical use the Rigid behavior.