I have used constrained Nodal rigid body with one reference node. I want to give displacement boundary condition to that reference node.
Hi @lucky,
I'm not sure if this is possible, but first you need to make sure that your reference node is the first node in the node set referenced by the constrained nodal rigid body (CNRB). The first node is the source point and represents the center of the CNRB. Then you can try to apply *Boundary_Prescribed_Motion_Node to that reference node.
If Dyna will not accept this, then you will need a different approach. You can create a simple element (1D, 2D, 3D etc.) which uses that reference node. Then make this part *Mat_rigid. Then you will use *Constrained_extra_nodes_set and refer to the rigid part as the PID and the other nodes will need to be in a node set and be referred to in the NSID. You will then be able to apply motion to the rigid part using *Boundary_prescribed_motion_rigid.