Edu Cat en Gpe Fs v5r16

CATIA Training

Generative Part Structural Analysis Expert Detailed Steps

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

Generative Part Structural Analysis Expert

Detailed Steps

Table of Contents 1. Advanced Pre-Processing Recap Exercise..................................................................................... 3 Master Exercise Frequency Analysis .................................................................................................... 11 1. Free-Free Vibration Analysis of a Crankshaft ............................................................................... 11 2. Computation of the Free Vibration Analysis of the Crankshaft ..................................................... 17 3. 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

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Select the vertex as support

•

Click on OK

1.2 -

•

You will now define the 2

nd

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 on the 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 and loads 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" is a "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

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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. nd • Do it again for the 2 virtual part You 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 computation parameters.

•

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:

•

th

Select the 7 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 between the two extreme positions. 20 images is the maximum: it gives you a smoother animation, but is also slower. You can change the current mode by clicking on "select"

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