HOW TO HANDLE SYMMETRY CONSTRAINTS AND RBE3 COUPLINGS | ERROR #2933
Hello, I have a problem to create a feasible model while using geometric symmetry (symmetry constraints). The model has 2 symmetries (xy plane and yz plane). The concentrated force is applied into an reference node which connects the inner node of the structure through a rbe3 element. The other side is also connected through RBE3 to a refrence node which is contrained.
While strictly constraining the nodes which are in the symmetry plane, e.g. xy plane the nodes will be contraint in dof 3 (z), 4(rx), 5(ry). But then I got following error massage:
*** ERROR # 2933 ***
There are more number of degree of freedoms with double dependency
than the number of independent degree of freedom near grid ID
2. PARAM,AUTOMSET is ineffective in this situation.
*** Run terminated because of error(s) in the input data.
Solver FAILED
optistruct:: Solver run finished.
My interpretation was that the problem is because some of the nodes are constraint in symmetry and the rbe3 coupling doublewise.
Excluding the dof leads to a weird behaivour of the coupling. The reference point is moving I guess and I could not fix it. Running the model in a full volume runs well, but it has too many elements and is too slow. The quarter model runs very quickly although it is very fine.
I need to calculate with rbe3 element because I need to apply concentrated force. So I cannot use nodal force instead.
I hope the community here could help me.