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8/3/2019 Edu Cat en Gpe Fs v5r16

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CATIA Training

COPYRIGHT DASSAULT SYSTEMES Version 5 Release 16November 2005EDU-CAT-EN-GPE-FS-V5R16

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Generative Part Structural Analysis Expert Detailed Steps

COPYRIGHT DASSAULT SYSTEMES 2

TTaabbllee ooff CCoonntteennttss1. Advanced Pre-Processing Recap Exercise.....................................................................................3

Master Exercise Frequency Analysis....................................................................................................111. Free-Free Vibration Analysis of a Crankshaft ............................................................................... 112. Computation of the Free Vibration Analysis of the Crankshaft .....................................................173. Visualizing the Results ..................................................................................................................19


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1. Advanced Pre-Processing Recap Exercise

Load Recap_Exercise_1_startup.CATAnalysis

Below is how looks like the part when you open it.

Under the GPS workbench:

1.1 - You will now define a contact virtual part:

Click on the "Contact virtual part" icon

Select this surface as support


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Select the vertex as handler

Set a clearance of 1 mm


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Click on Ok

Click on the "clamp" icon

Select the vertex as support

Click on OK

1.2 - You will now define the 2nd

restraint using the "Advanced restraint" tool

Click on


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Select this surface as support

Restraint the 3 translations and "rotation 1"

As there are several meshes of this part, you want to make sure that you will apply the restraints onthe good mesh.

Click on the "Mesh Part Filter icon"

The mesh part dialog box appears:


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Select "Mesh to work with"

Click on Ok

Click on Ok again to close the dialog box

So far, you should obtain this:

Now that you have applied all the restraints, you will apply the loads.

1.3 - Loads:

You will now apply acceleration

Click on


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Select the body as support

Select the correct mesh as done above using the "filter mesh part"

Set on Z: -9.8m/s2

Click on Ok

You will now applied a force vector

Click on


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Enter 5000N in the Z direction like below:

Select this surface as support:


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Select the Mesh "Mesh to work with" using the Mesh part Filter icon

Click on Ok

Below is what you should obtain:

In this Pre-Processing Recap exercise, you have seen how to apply different types of restraints andloads on a specific mesh.


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Master Exercise Frequency Analysis

1. Free-Free Vibration Analysis of a Crankshaft

Load the CATIA document "CATGPS_Crank_Shaft.CATPart"

In this master exercise, you will start by defining a "free Frequency Case". A "free frequency Case" isa "Frequency Case" without "restraints set" in the specification tree.

1.1 - Post-Processing

Open the GPS Workbench and create a Free Frequency Analysis of the crankshaftClick on the

shortcut icon

Click on Generative Structural Analysis button.

Select Free Frequency Analysis.

Click on the Rigid Virtual Part icon in the Mesh Specification toolbar

Select the flywheel face as support for the rigid virtual part.


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Select the left outer point as part handler.


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Click on OK

Click on Mass icon in Mass toolbar

Select the virtual part you have created, and assign a mass of 2kg

Click on OK


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You should obtain something like this:

You will now apply a virtual part on the other side of the Crank Shaft.

Click on the Rigid Virtual Part icon in the Mesh Specification toolbar

Select one of the two half cylindrical surfaces of damper as support for the rigid virtual part, i.e

Select outer point as part handler.


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Click on OK

Perform the same operation with the 2nd half cylinder (use the same handler point)

Click on the Mass icon in the Mass toolbar

Select one virtual part on damper, and enter mass value of 2kg


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Click on OK.

Do it again for the 2nd

virtual partYou should obtain:

The pre-processing is done. The next step is the computation.


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2. Computation of the Free Vibration Analysis of the Crankshaft

Load the CATIA document "CATGPS_Crank_Shaft2.CATAnalysis"

2.1 - Computation

Before you run the computation, you will have to modify some default settings.

Double-click on "Frequency Case Solution" in the tree, in order to edit the computationparameters.

Ask for 11 modes.

Click on OK

Click on

Select the "All" option


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Click on OK


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3. Visualizing the Results

Load the CATIA document "CATGPS_Crank_Shaft3.CATAnalysis"

3.1 - Post-Processing

Click on the "Deformation" icon in the Image toolbar

Double-click on "Deformed Mesh" in the tree:

The following dialog box appears:

Select the 7th

modes and click on OK


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Do it again for the following frequencies

For the mode of your choice, display an animation:

Click on the Animate icon in the Analysis Tools toolbar

You can animate either one way or both ways, and you can specify the number of images betweenthe two extreme positions. 20 images is the maximum: it gives you a smoother animation, but is alsoslower.You can change the current mode by clicking on "select"

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