HyperStudy

HS-1560: Study Setup Using LS-DYNA Model Parameters in HyperMesh

HS-1560: Study Setup Using LS-DYNA Model Parameters in HyperMesh

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HS-1560: Study Setup Using LS-DYNA Model Parameters in HyperMesh

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This exercise outlines the procedure for setting up a study for a LS-DYNA model in HyperMesh. This model has shape variables created using HyperMorph. In addition to the shape variables a HyperMesh parameter is created for material property, E.  These variables are then imported to HyperStudy as input variables. For this study, you will start HyperStudy from within HyperMesh.

The files used in this tutorial can be found in <hst.zip>/HS-1560/. Copy the tutorial files from this directory to your working directory.

hmtoggle_plus1greyStep 1: Importing a HyperMesh Parameter into HyperStudy
1.Start HyperMesh Desktop.
2.In the User Profiles dialog, set the user profile to LS-DYNA.
3.From the menu bar, click File > Open > Model.
4.In the Open Model dialog, open the boxbeam_morphed_noDV.hm file. A model appears in the graphics area.

hs_1560_model

5.In the Model browser, Material folder, click Material. The Entity Editor opens and displays the material's corresponding data.
6.Right-click on E and select Create and Assign Parameter from the context menu.

hs_1506_ee

7.In the Create Parameters dialog, change the Name to E and then click Close.

hs_1560_e

 
hmtoggle_plus1greyStep 2: Register LD-DYNA as a Solver

In order to use LS-DYNA as a solver, you need to register it in the preference file for HyperStudy.                                                          

1.Start HyperStudy.
2.From the menu bar, click Edit > Register Solver Script.
3.In the Register Solver Script dialog, click Add Solver Script.
4.In the HyperStudy - Add dialog, enter Dyna in the Label and Varname fields.
5.From the list of solver script types, select Generic.
6.Click OK.

hs_1560_registersolverscript

7.In the Path column of the script Dyna, click file_selection_icon.
8.In the Open dialog, navigate to the local installation of the LS-DYNA solver, and then have it point to the LS-DYNA solver executable without any spaces in the file path.
Note:If LS-DYNA is not installed locally, write a solver script to call it properly. For more information on this process, refer to Solver Script Files.

hs_1560_registersolverscriptdialog

9.Click Save.
10.In the Save Preferences dialog, navigate to your working directory.
Note:On UNIX, the preference file can also be saved in your home directory or in the working directory from which you launched HyperStudy.
11.In the File name field, enter a label for the new user preference file (example: userprefs.mvw).
12.Click Save.
Note:Do not overwrite the system preferences file, which is located in <install_directory>/hw by default.
13.Click Close.

When you start a new HyperStudy session, load your preference file by clicking File > Set Preference File from the menu bar. The default preferences file in the installation directory will be read, followed by the preference file that you specify. This ensures that all solvers, readers, and import templates are available.

Append the current user preference file by clicking Append, or exit solver registration by clicking Close. In the last case, the solver will only be registered for the current study.

 
hmtoggle_plus1greyStep 3: Perform the Study Setup

During this step, you will import the input variables that you created in Step 1: Importing a HyperMesh Parameter into HyperStudy.  

1.To start a new study, click File > New from the menu bar, or click files_new_hst2 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 HyperMesh model.
a.From the Directory, drag-and-drop the boxbeam_morphed_noDV.hm file into the work area.

hs_1560_drag_drop_model

b.In the Solver input file column, enter boxbeam_morphed.kas. This is the name of the solver input file HyperStudy writes during any evaluation.
c.In the Solver execution script column, select Dyna (Dyna).
d.In the Solver input arguments column, enter i= before $file.

hs_1560_define_models

5.Click Import Variables.
6.In the Model Parameters dialog, select parameters to import into HyperStudy.
a.Select the following parameters: E, shape1_h.S, shape1_w.S, and shape1_l.S.
b.Click Add.
c.Click OK

hs_1560_model_parameters

7.Go to the Define Input Variables step.
8.Review the input variable's lower and upper bound ranges.
9.Go to the Specifications step.

 
hmtoggle_plus1greyStep 4: Perform the Nominal Run
1.In the work area, set the Mode to Nominal Run.
2.Click Apply.
3.Go to the Evaluate step.
4.Click Evaluate Tasks. The run is executed using LS-DYNA, and an approach/nom_1/ directory is created inside the study directory. The approaches/nom_1/run__00001/m_1 directory contains the glstat (for the strain energy), binout0000 (for the reaction force), and d3hsp (for the structural mass) files, which are the result of the nominal run.
5.Go to the Define Output Responses step.

 
hmtoggle_plus1greyStep 5: Create and Define Output Responses
1.Click Add Output Response.
2.In the HyperStudy - Add dialog, add three output responses and label them Energy, Force, and Mass.
3.In the Expression column of the output response Energy, click hs_popupdialogicon.
4.In the Expression Builder, click the Functions tab.
5.From the list of available functions, select max.
6.Click Insert Varname. The function max()appears in the Evaluate Expression field.

hs_1560_max

7.Click the File Sources tab.
8.Click Add File Source.
9.In the HyperStudy - Add dialog, add one Solver output file.

solver_output_file

10.In the File column of Vector 1, click hs_popupdialogicon.
11.In the Vector Source dialog, navigate to the approaches/nom_1/run__00001/m_1 directory and open the glstat file.
12.From the Type, Request, and Component fields, select the options indicated in the image below.

hs_1560_response1

13.Click OK.
14.Click Insert Varname. The expression max(v_1[0]) appears in the Evaluate Expression field.
15.Remove [0] from the expression, so that it reads max(v_1). This expression produces the value of the energy value extracted from the nominal run.
16.Click OK.
17.Repeat steps 3 through 10 for the Force output response.
18.In the Vector Source dialog, navigate to the approaches/nom_1/run__00001/m_1 directory and open the binout0000 file.
19.From the Subcase, Type, Request, and Component fields, select the options indicated in the image below.

hs_1560_response2

20.Click OK.
21.Click Insert Varname. The expression max(v_2[0]) appears in the Evaluate Expression field.
22.Remove [0] from the expression, so that it reads max(v_2). This expression produces the value of the Force value extracted from the nominal run.
23.Click OK.
24.In the Expression column of the output response Mass, click hs_popupdialogicon.
25.In the Expression Builder, click the ASCII Extracts tab.
26.Click Add Extract Source.
27.In the HyperStudy - Add dialog, add one extract source.
28.In the File Path column of FileParser1, click hs_popupdialogicon.
29.In the Extract File dialog, navigate to the approaches/nom_1/run__00001/m_1 directory and open the d3hsp file.
30.To search for certain keywords within the d3hsp file, select the Keyword checkbox.
31.In the Keyword field, enter total mass of body.
32.Click Next. HyperStudy locates total mass of body in the file.
33.Highlight the value for total mass of body.
34.Right-click on the highlighted fields, and select Value from the context menu.

hs_1560_file_extract

35.Click OK.
36.Click Insert Varname. The expression f_1[0] appears in the Evaluate Expression field. This expression produces the value of the Mass value extracted from the nominal run.
37.Click OK.
38.Click Evaluate Expressions to extract the output response values.
39.Go to the Post processing step.
40.Click the Scatter 2D tab to view the values of the output responses, and to check that your output responses have similar values.

Use the Channel selector to set the X Axis to Energy and the Y Axis to Force.

Note:The version and architecture of LS-DYNA that you are using may produce slightly different output response values.

hs_1560_scatter_2d_plot

 

 

 

See Also:

HyperStudy Tutorials