Tutorial B5: Set Up and Run the Analysis

1. In the tree view, right-click on Analysis 1 and choose Edit.
   
2. Type Dome Lid Buckling for Name, and type Linear Buckling for Title. Select Linear Buckling from the Type drop-down menu.
3. Click the Options tab, and then enter 3 for the Number of Modes to be extracted. This will instruct Autodesk Nastran to calculate the first 3 eigenvalues.
4. Click OK to return to the tree view.
5. Save the model at this point.
6. In the tree view, right-click on Constraints under Subcase 1 and choose New.
7. Rename the constraint to Outer Face Fixed.
8. Orient the model inside Inventor Nastran so that you can clearly view and pick the outer most upper face.

   

9. Be sure that Subcase 1 is selected in the Subcases list.

   

10. Accept the default settings and click OK to create a fixed constraint.
11. Right-click on Loads under Subcase 1 and choose New.
12. Change the Name to Pressure.
13. Change the Type drop-down to Pressure. Type -1 for Magnitude under Load Definition.
14. Be sure that Subcase 1 is selected in the Subcases list.
15. Select all the upper faces in the model, either individually, or by using a box pick method.
16. The Load dialog should look as shown below.

    

17. Click OK. The model should look as shown below.

    

18. In the Part tree, right-click on Subcase 1, select Rename and type in Linear Buckling Case.
19. Once finished, the tree view should look as shown below.

    

20. Click Save to save your work.
21. Right-click on the empty space of the tree view and select Solve in Nastran.
22. Autodesk Nastran solves the model and displays the progress in the Autodesk Nastran Output window inside Inventor Nastran.
23. When you see the dialog "Nastran Solution Complete", click OK to load the results into Inventor Nastran.