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Thermoelastic analysis to get nodal relative displacements wrt a reference point


Hello everyone,
I have the following problem: I have to peroform a thermoelastic analysis, setting
CTE's of materials and applying a delta T to see the deformations. The output I
need is the displacement and rotation of some nodes with respect to a reference
point in space, that is not connected to any node! How can I extract a relative
disp. of a node wrt a certain point that is not part of my model, is there any way?
Absolute displacements are not useful because they depend on the constraint I am
Using FEMAP 9.31 and NX.Nastran 5.0.
Thanks and greetings!