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Step 4. Suppress Some of the Part Features (Cont.)
Illustrated here is the Unigraphics model with the suppressed features.
PAT302, Workshop 17, June 2003
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Step 2. Import the Unigraphics Part File
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Import a Unigraphics part file. a. File/Import. b. Object/Source: Model/Unigraphics. c. Select key.prt. d. Click on Apply. e. Click OK when the import summary appears..
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Step 7. Mesh the Model
a
Mesh the solid. a. Elements: Create/Mesh/Solid. b. Set the Elem Shape, Mesher, and Topology to Tet, TetMesh, and Tet10, respectively. c. Under Input List select Solid 1. d. Uncheck Automatic Calculation and enter 0.1 under Global Edge Length. e. Click on Apply.
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d c
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Step 6. Change the Base of the Model (Cont.)
Illustrated above is a before and after representation of the model. Note that the base of the model is thicker now.
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Suggested Exercise Steps
1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
Create a new database. Import a Unigraphics part file. Observe certain features of the model. Suppress certain features of the model. Unsuppress one of the features previously suppressed. Edit a parameter value for the base of the model. Create a TetMesh for the solid. Edit the display features to get a better visual representation for the model. Change the diameter of the hole in the part. Verify that the copy of the part(model) has been updated.
WORKSHOP 17 INTRODUCTION TO PARAMETERS AND FEATURES
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Problem Description
This exercise involves in editing Unigraphics features and parameter values. This requires importing a Unigraphics part file. It will not work with a Parasolid xmt model. Certain features are to be suppressed. A feature, previously suppressed, is to be unsuppressed. The value of some parameters are to be changed.
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c d
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Step 8. Edit the Display Features
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j
a
Erase the Geometry and change view options. a. Click on the Plot/Erase icon. b. Under Geometry select Erase. c. Click on OK. d. Display/Finite Elements… e. Under Show Only Free select Faces (in Wireframe). f. Click on Apply, then Cancel. g. Viewing/Angles. h. Change the angle by inputting the following: 49.81 -35.05 -1.93. i. Click Apply, then Cancel. j. Change the render style to Smooth Shaded.
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Step 1. Create a Database
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d
Create a new database. a. File/New. b. Enter test1 as the file name. c. Click OK. d. Choose Default for the Tolerance. e. Select MSC.Nastran as the Analysis Code. f. Select Structural as the Analysis Type. g. Click OK.
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A warning message similar to the following should appear in the history window: “Importing Unigraphics Features will require that the Unigraphics part file be modified to reflect the changes made in PATRAN. Therefore, a copy of the part is made in /tmp/test1_ug_copy/key.prt_msc_test1 prior to import. Please do not remove or modify this copy in any way as subsequent model updates are dependent on the undisturbed copy. This copy will not work with any other PATRAN databases.” In other words MSC.Patran will make a copy of the part file and place it in a subdirectory titled [database_name]_ug_copy. MSC.Patran must be able to access this part file to modify features. If the part file is not in the same location the user will be prompted for the new location. PAT302, Workshop 17, June 2003 WS17-6
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Step 6. Change the Base of the Model
When the Unigraphics model has been created parametrically MSC.Patran has the capability to modify the value of the parameters. a. Geometry: Edit/Feature/ Parameters. b. Click on BLOCK(0) in Feature List. c. Click in the cell corresponding to Size X and Definition. d. Under Input Parameter Definition enter 1.5, and press Enter. e. Click on OK. f. Click on Apply.
Blends
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Step 4. Suppress Some of the Part Features
Remove certain features using the suppress method. a. Geometry: Edit/Feature/ Suppress. b. Under Feature List select CYLINDER(4). c. Click on Apply. d. Repeat the previous step to suppress BLENDS (8), (9), and (10) (the blends indicated earlier). NOTE: the hole disappears from the viewport. This method is known in Unigraphics as suppressing a feature. Also when the feature is selected from the list it is highlighted in the viewport. This is one means of selecting features. The features can also be selected from the viewport. PAT302, Workshop 17, June 2003