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Introduction to HyperWorksHyperWorks 11.0 Release NotesHyperWorks ApplicationsHyperWorks DesktopHyperWorks SolversHyperWorks EnterpriseEngineering Solutions

CFDCrashNVH

NVH-1000: Acoustic CavityNVH-1100: NVH Director Assembly

Manufacturing SolutionsHyperMath SolutionsMotion Solutions

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Release: 11.0.130

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HyperWorks Tutorials

Page 1NVH-1000: Acoustic Cavity

6/9/2013 2:49:05 PMhttp://www.altairhyperworks.com/(S(5t51og1kf42dlz2uw1sqyt03))/hwhelp/Altair/hw11.0/help/hwtut/nvh_1000.htm

HyperWorks Tutorials

NVH-1000: Acoustic Cavity

Step 1: Set the User Profile to RADIOSS Bulk Data

Step 2: Open the taurus.hm model1. Click File > Open > Model.

2. Browse to <installation_directory>/tutorials/es/nvh/acoustic.hm.

3. Click Open to open the model into session.

Step 3: Hide the seat cushion components1. Expand the Components folder in the Model Browser.

2. Select Rear_Seat_Cushion, IN-driver seat back cushion, IN-crv seat head rest, IN-driver seat lower cushion, IN-pass seat lower cushion, and IN-passeat head rest from the list of components.

3. Right click and select Hide.

Step 4: Preview the meshThe imported model has been restricted to just those parts that will be used to create the cavity. The seat cavities have already been built in this model.

1. Click Mesh > Create > Acoustic Cavity Mesh to open the Acoustic Cavity Mesh Generation panel.

2. Click the comps selector for structure to open the Component Selection panel.

3. Click comps >> displayed to select all components.

4. Click select to complete the selection.

5. Click the comps selector for seats.

6. Click the Last Page ( ) button to go to the last page of components.

7. Select the IN – pass seat back cushion, IN – pas seat head rest and Rear_Seat_Cushion on this page.

8. Click the Previous Page button and select IN – driver seat back cushion, IN – drv seat head rest, IN – driver seat lower cushion, and IN – pass seatlower cushion.

9. Click select to complete the selection of the seats.



10. Make sure the seat coupling toggle is set to node to node remesh.

11. Enter 40 for element size=.

12. Enter 100 for gap patch size =.

13. Enter 200 for hole patch size =.

14. Click the create hole elements option to activate it.

15. Click preview to see a preview of the mesh.

Preview of mesh

The mesh appears in the graphics area and the Acoustic Cavity tab opens in the tab area.

Step 5: Review the mesh

1. Right click on AC_Structural.1 in the AcousticCavity tab and click Isolate.

AC_Structural.1 isolated

2. Right click on the other components in the list and click Show.

3. Right click on AC_Structural.1 and click Hide.



4. Click the mesh icon next to each of the seat cavities to see the mesh.

Seats added to the visible components

5. Select each of the seat cavity’s and right click and click Hide.

Step 6: Delete two of the patched holes

1. In the Model Browser, right click on the ^patched_holes component and click Show.

2. Zoom into the area shown in the figure.



3. If necessary, right click on AC_Structural.4 and click Hide.

4. Click the Find icon to open the Find panel.

5. Click the find attached subpanel.

6. Change the attached to: setting to node.

7. Select the node in the center of the patch as shown in the image below.

8. Click find to find the elements attached to the node.

9. Click save found to use the found elements later.

10. Click return to exit the panel.

11. Click the Delete icon to open the Delete panel.

12. Set the selector to elems if not already set.

13. Click elems >> retrieve to select the elements saved earlier.

14. Click delete entity to delete the elements.

15. Rotate the model to the view shown below.

16. Repeat 5-15 to delete the elements on the opposite side.


Step 7: Preview the meshWith the patched holes deleted, the acoustic cavity mesh will be previewed again.

1. Click Reject on the AcousticCavity tab.

2. Click the Isometric View icon to reset the view of the model.



3. Click Mesh > Create > Acoustic Cavity Mesh to open the panel.

4. Click the comps selector for structure to open the Component Selection panel.

5. Click comps >> displayed to select all components.


7. Click the comps selector for seats.

8. Click the Last Page ( ) button to go to the last page of components.

9. Select the IN – pass seat back cushion, IN – pas seat head rest and Rear_Seat_Cushion on this page.

10. Click the Previous Page button and select IN – driver seat back cushion, IN – drv seat head rest, IN – driver seat lower cushion, and IN – pass seatlower cushion.

11. Click select to complete the selection of the seats.

12. Enter 40 for element size=.

13. Enter 100 for gap patch size =.

14. Enter 0 for hole patch size =.

15. Click preview to preview the mesh.

Note that the rear door volumes are now a part of the overall volumes.

Step 8: Create the mesh1. Select AC_Structural.2 through AC_Structural.10, right click and select Hide.

2. Uncheck the boxes in the Mesh column for AC_Structural 2 through AC_Structural.10.

3. Set the Mesh type option to Hexa-tetrahedra.

4. Set the Response points: to Read from file.

5. Click the … button to browse for the file.

6. Select ACOUSTIC_RESPONSE_PTS.csv and click Open.

7. Click Mesh to create the mesh.



Completed mesh

8. Click Close to close the Acoustic Cavity tab.


Step 9: Rename the components created by the Acoustic Cavity Mesh1. Open the Components folder in the Model Browser.

2. Right click on AC_Structural.1 and click Rename.

3. Name the component BODY_CAVITY and press Enter.

4. Right click on AC_Seat.1 and click Rename.

5. Name the component DRV_SEAT and press Enter.


7. Name the component REAR_SEAT and press Enter.


9. Name the component PASS_SEAT and press Enter.

Step 10: Create material cards for the cavities1. Right click in the Model Browser and click Create > Material.

2. Set the Type field to FLUID.

3. Enter BODY_CAVITY into the Name field.

4. Select MAT10 for Card image.

5. Activate the Card edit material upon creation checkbox.

6. Deactivate the Close dialog upon creation checkbox as there are additional materials to create.



7. Click Create to create the material and edit the material card.

8. Click [BULK] and [C] in the Card Edit panel and leave the default values.


10. With the Create material dialog open, enter SEAT_CAVITY in the Name field.

11. Click Create to create the material.

12. Click [C] and enter 8.8e+4 for the value.

13. Click [BULK] and accept the default value.

14. Click return to complete the card edit.

15. Click Cancel to close the Create material dialog.

Step 11: Create properties for the model1. Right click in the Model Browser and click Create > Property.

2. Set the Type field to all.

3. Enter BODY_CAVITY into the Name field.

4. Select PSOLID for Card image.

5. Click the Material tab to assign a material to the property.

6. Click the Assign material checkbox to activate it.

7. Click BODY_CAVITY for the Name field.

8. Activate the Card edit upon material creation checkbox.

9. Deactivate the Close dialog upon creation checkbox as there are additional materials to create.



10. Click Create to create the property.

11. Click FCTN to activate the option.

12. Click the FCTN field and select PFLUID.

13. Click return to exit the property card image.

14. Click the Property tab in the Create property dialog.

15. Enter SEAT_CAVITY into the Name field.

16. Click the Material tab to assign a material to the property.

17. Click the Assign material checkbox to activate it.

18. Click SEAT_CAVITY for the Name field.

19. Click Create to create the material and edit the material card.

20. Click FCTN to activate the option.

21. Click the FCTN field and select PFLUID.

22. Click return to complete the card edit.

23. Click Cancel to close the Create property dialog.

Step 12: Assign the properties to the components1. Expand the Property folder in the Model Browser.

2. Right click on the SEAT_CAVITY property and click Assign.

3. Click elems >> by collector and select the REAR_SEAT, DRV_SEAT, and PASS_SEAT components.


5. Click proceed to complete the assignment.

6. Right click on the BODY_CAVITY component and click Assign.

7. Click elems >> by collector and select BODY_CAVITY.


9. Click proceed to complete the assignment.

Step 13: Renumber the nodes, elements, properties, and materials1. Click Geometry > Renumber > Nodes to open the Renumber panel.

2. Click nodes >> displayed to select the displayed nodes.

3. Enter 9000000 in the start with field.



4. Click renumber to renumber the nodes.

5. Change the selector to elems.

6. Click elems >> displayed to select the displayed elements.

7. Click renumber to renumber the elements.

8. Change the selector to props.

9. Click props and select BODY_CAVITY and SEAT_CAVITY.

10. Click renumber to renumber the properties.

11. Change the selector to mats.

12. Click mats and select BODY_CAVITY and SEAT_CAVITY.

13. Click renumber to renumber the materials.


Step 14: Export the model1. Click File > Export > Solver Deck.

2. For File Type select RADIOSS.

3. For Template select Bulk Data standard format.

4. Browse to a location in the File field and enter acoustic.fem as a name for the model.

5. Expand the Export options.

6. For Export select Displayed from the menu.

7. Activate Write HM comments.

8. Click Export to export the model.

Step 15: Edit the .fem fileThe .fem file is edited to remove the begin bulk and enddata cards that will allow it to be added to an include card at a later date.

1. Open the file acoustic.fem using a text editor.

2. Use CTRL+F to find the begin bulk entry.



3. Delete begin bulk from the file.

4. Find the enddata entry.

5. Delete the enddata entry from the file.

6. Save the acoustic.fem file.

The .fem file is now ready to be added to an include. This completes the tutorial.

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