Rahul Kumbhar
Ansys Employee
Hi @Moustafa,
The script appears to do overconstraints. First you have created three translational springs for each base node. (total springs = 3xno of base nodes). The other ends of these translational springs are fixed.
Then you have created three rotational springs connecting a master node created in space. The other ends of the springs are fixed. (Total springs =3 only). Then there are CEs connecting the masternode to all base nodes. 
During the rotation, the equivalent stiffness should be because of both translational springs and rotational srpings.