When do we use set displacement/ set reference, please put an example in explaining

Question

Set displacement vs set reference in the system panel. When do we use set displacement/ set reference, please put an example in explaining

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Michele Macchioni · Answer

Karthic,

* Reference is the System in which the nodal coordinates of your grids are written;
 * Displacement is the System in which the output (nodal displacement) are evaluated; 
 
For OptiStruct the displacement system is thus the one w.r.t. which you are also constraining or enforcing a displacement using SPC or SPCD respectively.

Hope this clarifies.

Thanks

Michele