HS-1021: Working with a Parameterized File Model for Shape Variables

In this tutorial you will learn how to create a template file for shape variables and how to import them to HyperStudy. The input variables are three shape variables; xtrans, ytrans and radius. Each of these shapes are created by perturbing the mesh in the corresponding direction by 1 unit.

The sample base input template used in this tutorial can be found in <hst.zip>/HS-1021/. Copy the tutorial files from this directory to your working directory.


Figure 1: Double Symmetric Plate Model	Figure 2: Double Symmetric Plate Model with Shape Vectors

1.	Start HyperMesh Desktop.

2.	In the User Profiles dialog, set the user profile to OptiStruct.

3.	From the menu bar, click File > Open > Model.

4.	In the Open Model dialog, open the plate_with_shapes.hm file. A model appears in the graphics area.

5.	From the Analysis page, click optimization.

hs_1021_optomizatin panel

6.	Click shape.

7.	Go to the desvar subpanel. In this subpanel you will create three design variables (XTrans, YTrans and Rad) for three shapes.

8.	Create a design variable.

a.	In the desvar= field, enter XTrans.

b.	Click Shape=.

c.	Select the shape, xtrans.

d.	Click create.

hs_1021_create shape

9.	Create two more design variables labeled YTrans and Rad. Select the shape ytrans for design variable YTrans, and select the shape radius for design variable Rad.

10.	Go to the export subpanel to export the shape variables.

11.	Set analysis code to HyperStudy.

12.	Set sub-code to OptiStruct.

13.	Click export as.

hs-1021-1

14.	In the Save As dialog, save the file as plate_with_shapes.shp.

15.	Quit HyperMesh by clicking File > Exit from the menu bar.

1.	Start HyperStudy

2.	From the menu bar, click Tools > Editor. The Editor opens.

3.	In the File field, open the plate_with_shapes.fem file.

4.	In the editor, right-click and select Select Nodes > GRID from the context menu. All of the GRID cards in the plate_with_shapes.fem file highlight.

hs_1021_find

5.	Right-click on the highlighted cards and select Include Shape from the context menu.

6.	In the Shape Template dialog, open the plate_with_shapes.optistruct.node.tpl file.

7.	Click Save.

8.	In the Save Template dialog, save the file as plate_with_shapes.tpl.

9.	Close the Editor.

In this step, you will import the design variables (known as input variables in HyperStudy) created in Step 1: Exporting Shape Variables from HyperMesh to HyperStudy.

1.	To start a new study, click File > New from the menu bar, or click on the toolbar.

2.	In the HyperStudy – Add dialog, enter a study name, select a location for the study, and click OK.

3.	Go to the Define Models step.

4.	Add a Parameterized File model.

a.	From the Directory, drag-and-drop the plate_with_shapes.tpl file into the work area.

hs_1021_drag_drop_model

b.	In the Solver input file column, enter plate.fem. This is the name of the solver input file HyperStudy writes during any evaluation.

c.	In the Solver execution script column, select OptiStruct (os).

5.	Click Import Variables. Three input variables are imported from the plate_with_shapes.tpl resource file.

6.	Go to the Define Input Variables step.

7.	Review the input variable's lower and upper bound ranges.

8.	Go to the Specifications step.

1.	In the work area, set the Mode to Nominal Run or System Bound Check.

A Nominal Run performs one run, and sets the input variable's values to their initial values.

hs_1021_nominal_run

A System Bound Check performs three runs, and sets all of the input variable's values to their initial, lower bound and upper bound values.

hs_1021_system_fitness_run

2.	Click Apply.

3.	Go to the Evaluate step.

4.	Click Evaluate Tasks.

5.	Go to the Define Output Responses step.

In this step you will create two output responses: Mass and Displacement.

1.	Create the Mass output response.

a.	From the Directory, drag-and-drop the plate.out file, located in approaches/nom_1/run_00001/m_1, into the work area.

b.	In the File Assistant dialog, set the Reading technology to Altair® HyperWorks® and click Next.

c.	Select Single item in a time series, then click Next.

d.	Define the following options, and then click Next.

•	Set Type to Mass.

•	Set Request to Mass.

•	Set Component to Value.

hs-1020-file-assist-resp1

e.	Label the output response Mass.

f.	Set Expression to First Element.

Note:

Because there is only a single value in this vector, [0] is inserted after v_1, thereby choosing the first (and only) entry in the vector.

hs-1020-file-assist-resp1_2

g.	Click Finish. The Mass output response is added to the work area.

2.	Create the Displacement output response.

a.	From the Directory, drag-and-drop the plate.h3d file, located in approaches/nom_1/run_00001/m_1, into the work area.

b.	In the File Assistant dialog, set the Reading technology to Altair® HyperWorks® and click Next.

c.	Select Single item in a time series, then click Next.

d.	Define the following options, and then click Next.

•	Set Subcase to Subcase 1 (Load).

•	Set Type to Displacement (Grids).

•	Set Request to N298.

•	Set Component to MAG.

e.	Label the output response Displacement.

f.	Set Expression to First Element.

hs-1020-file-assist-resp2

g.	Click Finish. The Displacement output response is added to the work area.

3.	Click Evaluate to extract the output response values.

hs-1020-responses

4.	Proceed to the desired study type (DOE, Optimization, of Stochastic study).

HS-1021: Working with a Parameterized File Model for Shape Variables

HS-1021: Working with a Parameterized File Model for Shape Variables

HS-1021: Working with a Parameterized File Model for Shape Variables

See Also: