exercise 25 – combining femap models - · pdf fileexercise 25 – combining femap...

Exercise 25 – Combining Femap Models

CT2050 Femap 101 for Femap v11.1 – Student Workbook 25 - 1 © Siemens AG 2013 All rights reserved. Siemens PLM Software

Introduction

In this exercise, you will go through the process of merging Femap models using both Femap Neutral files and the File, Merge command.

This exercise requires that you have a good working knowledge of Femap. The steps you will use in this exercise are:

Set Femap Preferences to use Inches as the Geometry Scale Factor.

Open an existing Femap Model file of an aircraft frame subassembly and a second Femap Model file containing a frame section.

Merge the Lower Left Frame model into the Frame assembly model by exporting a Femap Neutral File of the Lower Left Frame, and then import that file into the Frame assembly model.

Merge the Lower Left Frame into the Frame Assembly using the File, Merge command.

The preferences and units used in this exercise are:

Solid Geometry Scale Factor: Inches Force: lbf Pressure: psi Density: lbf/in3



Step 1: Start Femap and Set Preferences

Start Femap v11.1.1

From either a desktop icon, or from the Windows Start menu, select the icon for Femap v11.1.1.

Set your Femap preferences for the correct Geometry Scale Factor. The Geometry Scale Factor is number of length units per meter

used by Parasolid.

Select the command, File, Preferences.

In the Preferences dialog box, select the Geometry/Model tab.

Under the Geometry Preferences option group, set the Geometry Scale Factor to Inches.

Click OK to apply the changes and close the dialog box.

Click HERE to view a video of these steps



Step 2: Open an existing Femap Model file of an aircraft frame subassembly and a second Femap Model file containing a frame section.

Open a Femap model file of a frame subassembly.

Open the Femap model file, Ex25 – Lower Frame Assembly. This file and the second model file will be located in either the Femap 101 class files, Geometry folder or a different folder indicated by your instructor.

Open a Femap model file of a frame.

Open the Femap model file, Ex25 – Lower Left Frame.

Close any other open model file, except for the two (2) model files you just opened.

Tile the window display so that both model files are opened side-by-side.

Select the command, Window, Tile Vertical.

Your Femap graphics pane layout should appear as below:




Step 3: Merge the Lower Left Frame model into the Frame assembly model by exporting a Femap Neutral File of the Lower Left Frame, and then import that file into the Frame assembly model.

Export a Femap Neutral File (.neu file) of the Lower Left Frame.

Click in the graphics pane of the Lower Left Frame model, or, alternatively, click on the tab for the model, Ex25 – Lower Left Frame.modfem.

Select the command, File, Export, Femap Neutral.

In the Write Model to Femap Neutral dialog box, enter the File Name as Lower Left Frame. The .neu file name extension is automatically added to the file name.

Click Save to continue with saving the Femap Neutral File.



In the Neutral File Write Options dialog box, accept the default options and complete writing the Neutral File by clicking OK.



Import the Femap Neutral File into the Lower Frame Assembly model file.

Activate the Lower Frame Assembly by clicking in the Graphics pane of the Lower Frame Assembly Femap model.

Select the command, File, Import, Femap Neutral.

In the Read Model From Femap Neutral dialog box, select the file, Lower Left Frame.neu.

Click the Open button.



In the Neutral File Read Options dialog box, uncheck the option for Read Views.

Click OK to import the Femap Neutral File into the Lower Frame Assembly model.



Fill the Graphics pane by pressing the ctrl+a hotkey (View, Autoscale, Visible command).

Note that because the option for ID Offset was not used, merged entities with the same entity ID that previously existed in the Lower Frame Assembly were overwritten causing the model to be “corrupted”.

Press the ctrl+z hotkey (Tools, Undo command) to undo the import of the Femap Neutral File.




Step 4: Merge the Lower Left Frame into the Frame Assembly using the File, Merge command.

Click HERE to view a video of the following steps.

Merge the Lower Frame into the Lower Frame assembly using the File, Merge command and it’s default options.

Select the command, File, Merge.

In the Model Merge Manager dialog box, note the From Model and To Model reflect the names of the two model files open.

Click OK to merge the two models.



Note how the Lower Frame has been merged into the Lower Frame Assembly without any corruption of the model that occurred when a Femap Neutral File was imported without an ID Offset as the File, Merge command by default will set renumbering to avoid ID conflicts.

Undo the File, Merge command by pressing the ctrl+z hotkey (Tools, Undo command).



Merge the Lower Frame into the Lower Frame assembly, this time by setting renumbering options, selecting only those entities that need to be merged and simultaneously transform the Lower Frame into its correct position in the Lower Frame Assembly.

Select the File, Merge command.

In the Model Merge Manager dialog box, uncheck the Entity Type check boxes for Load Set, Constraint Set, Analysis Set, Function, Data Surface and Group.

Do NOT click OK as several other options need to be set.



Set renumbering strategy for Materials and Properties.

Select the rows for Material and Property. You can use either shift-click or ctrl-click for selection in this dialog box.

With Material and Property selected, select the Overwrite Duplicates radio button under Renumbering and Duplicates group.

Click the Update Selected button.



Note how the values of the Renumber To and Renumbering columns for Materials and Properties have been updated.



Set the renumbering strategy for Nodes and Elements.

Select the rows for Node and Element.

With Node and Element selected, select the Block Renumbering radio button under Renumbering and Duplicates group.

Set the value of Renumber To, to 4100001.


Again, note how the values of the Renumber To and Renumbering columns for Nodes and Elements have been updated.



Set the renumbering strategy for Coordinate Systems. In this case, you will select the coordinate systems to be merges.

Select the Coordinate System row.

With Coordinate Systems selected, select the Block Renumbering radio button under Renumbering and Duplicates group.


Click the Entity Selection Select radio button.




In the Entity Selection – Select Coordinate System To Merge dialog box, click the List Entities icon ( ).

In the Select One or More Coordinate System(s) dialog box, select (click the check boxes) for 12..Frame to Lower Beam and 13..Floor Beam Interface. Click OK to continue.



Set the renumbering strategy for Solids.

Select the row, Solid.

With Solid selected, select the Block Renumbering radio button under Renumbering and Duplicates group.





Set the renumbering strategy for Solids.

Select the rows for Point, Curve and Surface.

With three rows still selected, select the Block Renumbering radio button under Renumbering and Duplicates group.





Set the option for transforming the Lower Frame.

Under Model Orientation, check the box for Transform Merged Model.

Set the From coordinate system to 12..Frame to Lower Beam.

Set the To coordinate system to 41..Frame – Lower Left.

Complete the merging of the Lower Frame into the assembly by clicking the OK button in Model Merge Manager dialog box.



Note how the Lower Frame has been merged into the assembly with the correct orientation.

Optionally, browse the Model Info pane to highlight the newly merged objects in the Lower Frame Assembly model

Exit Femap. If you want to save the merged Femap model, save it under a different file name with the File, Save As command.

exercise 25 – combining femap models - · pdf fileexercise 25 – combining femap...

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