Create design constraints and responses

You can define constraints either in the solution or in the subcases. Typically, you will create constraints in a subcase.

1. In the Simulation Navigator, right-click one of the subcases and select Edit.

2. Click Create Design Constraint (next to Design Constraints).

3. Click Create.

4. In the Name box, type a descriptive name for the constraint.

5. Click Create Modeling Object (next to Response).

6. In the Name box, type a descriptive name for the response, such as Weight Response.

7. In the Label box in the Response Definition group (the second Label box), type a short descriptive label for this response. After you solve, this label is written to the .f06 file to identify this response.

8. From the Response Type list, select the type of quantity to constrain (for example, WEIGHT, STRESS, FREQ, and so on).

9. Enter or select the appropriate values for the attributes associated with this response.For information about the response attributes, see the DRESP1 bulk data entry in the Simcenter Nastran Quick Reference Guide. The Stress, Strain, and Force responses require an Item Code that specifies the type of element output and the component. For example, linear stress at the center of a CQUAD4 (element code 33), von Mises component at the Z1 fiber location (bottom side of the element) is represented by item code 9. For a list of item codes, see Item Codes in the Simcenter Nastran Quick Reference Guide.

10. Some response attributes require you to specify a node or group of nodes using a Group. You can select an existing group or create a new one. To create a new group, click New Group . For more information about groups, see Groups.

11. Click OK.

12. In the Lower Bound box, enter the lower bound on the response quantity. For example, to constrain displacement of a node identified in the response, enter the lowest displacement to allow, such as –0.05 mm.Note: Make sure to enter the values in the model units. For example, if the response is for displacement, and your model units are metric, enter the value in mm.

13. In the Upper Bound box, enter the upper bound on the response quantity.

14. If the constraint's response is of type FRDISP, FRVELO, FRACCL, FRSPCF, FRFORC, or FRSTRE, you can specify a frequency range using the Low End of Frequency Range and High End of Frequency Range values. The Upper Bound and Lower Bound are then applicable to the response only when the value of the forcing frequency of the response falls within this frequency range.

15. Click OK to finish creating the constraint and return to the Modeling Objects Manager.

16. After you create a design constraint, it appears in the Selection list in the Modeling Objects Manager. To specify that the solver should use the new design constraint in the solution, select the design constraint and click the Add to List button. The design constraint now appears in the List and you can close the Modeling Objects Manager.

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Create design constraints and responses, Simcenter 3D 2021.1 Series

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