RBE2 element 1

[student2005]

Hallo, I have to make an FE analysis of the fuselage of a light aircraft. The stucture is a truss (beams) and skin (shells). The masses of two pilots, engine, landing gear and so on are simulated as lumped masses and conected to the structure with RBE2 elements (no rotattion in dependant nodes, only x-, y-, z- translations). In my case, one node of the structure have to be a dependent for two MPC but this is not allowed in nastran (fatal error). How can I solve this problem? Thanks.

 

[RPstress]

It's more usual to apply forces to and distribute masses on structures with an RBE3. An RBE2 "locks together" all of the dependent nodes. That probably isn't what you want here.