Calculate Relative Displacement

Calculate relative displacement between two parts along a line segment. This feature is supported for static analysis.

1. On the Project Tree, open the Analysis Workbench.
2. Click (Pick info).
3. In the dialog, select the Relative Displacement tab.
4. Enter Search depth.
5. Optional: Enter the failure criteria for Gap tolerance (Open close) and Gap tolerances (Stick slip).
6. Under Segments, define the line segment in one of the following ways:

   Option	Steps
   Start	Select the Start radio button. A ray is launched which is normal to the surface and passes through the part.
   Custom	Select the Custom radio button. In the modeling window, select the entry and exit points on the part. The entry and exit points are populated in the dialog.
   Start from datum points	Select the Start from datum points radio button. In the drop-down menu, select a point set.

   Line segments are drawn along the gaps of the parts. The x-axis of the system is along the segment from entry to exit points. The other two axes are calculated as follows.

   • If the local x-axis is not parallel to the global y-axis:

     Z_local = X_local x Y_global

     Y_local = Z_local x X_local

   • If the local x-axis is parallel to the global y-axis:

     Y_local is negative of X_global if X_local is along positive Y_global, and vice versa.

     Z_local = X_local x Y_local

   The following parameters are evaluated in the local coordinate system:

   • Initial Gap (X), Final Gap (x) , Relative displacement X, Relative displacement YZ, Initial status, Final status (open close), Final status (stick slip)

   Tip: Final status of the line segment shows open/close, overlap, and stick/slip based on the failure criteria.