simd4catia_flex_guide

MSC SimDesigner™

R3 CATIA® V5R17 EditionSimDesigner Motion Flex Guide

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C o n t e n t sSimDesigner Motion Flex Guide

1 SimDesigner Motion Flex ReferenceWelcome to SimDesigner Motion Flex 2

About Exporting 3

About Flexible Bodies 4Where to Use Flexible Bodies 4Where to Use Flexible Bodies with Care 4

Activating a Flexible Body 5

Automatically Creating Virtual Parts 7

Modeling Flexible Bodies 8

Stress/Deformation History 9

Reviewing Results 10

Starting and Licensing SimDesigner Motion Flex 11

Supported Forces and Joints 12

Theory of Flexible Bodies 14

2 SimDesigner Motion Flex ExamplesFlexible Body Tutorial 16Defining the Motion Model 16Exporting a Part to SimDesigner Structures Workbench 19Performing a Modal Analysis 22Making a Part Flexible 22Performing a Simulation 23Reviewing the Results 24

Import Nastran Results Tutorial 25Perform License setting 25Export the Part to the Structure Workbench 26Performing an Import Results 28

SimDesigner Motion Flex Guide iv

Making a Plank Part Flexible 28Performing a Simulation of the Diving Board 29Reviewing the Results of the Diving Board 29

Chapter 1: SimDesigner Motion Flex ReferenceSimDesigner Motion Flex Guide

1 SimDesigner Motion Flex Reference

Welcome to SimDesigner Motion Flex

About Exporting

About Flexible Bodies

Activating a Flexible Body

Automatically Creating Virtual Parts

Modeling Flexible Bodies

Stress/Deformation History

Reviewing Results

Starting and Licensing SimDesigner Motion Flex

Supported Forces and Joints

Theory of Flexible Bodies

SimDesigner Motion Flex GuideWelcome to SimDesigner Motion Flex

2

Welcome to SimDesigner Motion FlexMSC SimDesigner™ SimDesigner Motion Flex software is an add-on module to SimDesigner Motion Workbench that enables you to add flexible bodies to your models to achieve more realistic simulation results. The SimDesigner Motion Flex online help explains how to add flexible bodies to the models you build in SimDesigner Motion Workbench. It contains a tutorial, overview, and theory information on integrating and managing flexible bodies.

The SimDesigner Motion Flex online help assumes that you know how to run SimDesigner Motion Workbench and SimDesigner Structures Workbench. It also assumes that you have a moderate level of finite element modeling proficiency. To use SimDesigner Motion Flex, you need access to SimDesigner Structures Workbench so you can generate the modal flexibility data used by SimDesigner Motion Workbench.

By integrating flexible bodies into your model, you can:

• Capture inertial and compliance properties during handling and comfort simulations. • Predict loads with greater accuracy by allowing SimDesigner Motion Workbench to account for

flexibility during simulations. • Study deformations.

3Chapter 1: SimDesigner Motion Flex ReferenceAbout Exporting

About ExportingYou can export a motion part to SimDesigner structures Workbench to compute modal flexibility results (MNF) that you can then import back into SimDesigner Motion Workbench.

To Export to SimDesigner Structures Workbench:From the specification tree, under the Motion branch, right-click the moving part, point to the part name, and then select Export to Linear Structure.

For detailed steps on defining the FE model, see the Generative Structural Analysis documentation.

For the option: Do the following:Motion part to export If you launch the dialog box from:

• The specification tree, this text box is already filled in.• The SD Motion menu, you must select a valid part

from the specification tree or the screen.Document creation Do one of the following:

• Select to create a new CATAnalysis document.• Use an existing CATAnalysis document to which to

append a new frequency loadcase.CATAnalysis document Do one of the following:

• Enter a name for a CATAnalysis document. • Browse for an existing document.

Note: The .mnf file that is exported is not compatible with Adams 2003, but is compatible with Adams 2005. It can be modified for use with Adams 2003 outside of the MSC SimDesigner environment.

SimDesigner Motion Flex GuideAbout Flexible Bodies

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About Flexible BodiesSimDesigner Motion Flex uses an assumed modes method of modeling flexible bodies. This method of representing flexible bodies is called modal flexibility. Modal flexibility assigns a set of mode shapes (frequently eigenvectors) to a flexible body. The flexible body modeling element designates a system state variable to each eigenvector and calculates the relative amplitude of each eigenvector during a time analysis. The principle of linear superposition is then used to combine the mode shapes at each time step to reproduce the total deformation of the flexible body.

This modal method of modeling flexibility can be very useful in problems that are characterized by high elasticity and moderate deflections (deflections less than 10% of a characteristic length of the body). Modal flexibility also provides a means of directly correlating flexibility results with finite element analysis (FEA) results.

Where to Use Flexible Bodies You should use flexible bodies wherever you expect component flexibility to affect the dynamic behavior of your model or when you require accurate information about the deformations of a component in your model. If you are a handling analyst who is concerned about the negative effects of component flexibility or a component designer who is concerned about component strength and fatigue life, you can benefit from the ability to very accurately model component flexibility.

Where to Use Flexible Bodies with CareWhen you use flexible bodies, you should remember that flexible body deformations are a linear combination of deformation shapes. Consequently, you must take special precautions when modeling higher order deformations, such as those that occur when deformations are large, or when attempting to correctly model centrifugal stiffening of rotating systems. You can overcome these limitations by dividing a flexible body into multiple flexible bodies and creating individual parts with connectors (bushings) joining the segments.

5Chapter 1: SimDesigner Motion Flex ReferenceActivating a Flexible Body

Activating a Flexible BodyYou can activate flexibility in a SimDesigner Motion Workbench part by associating a CATAnalysis document. The CATAnalysis document must have been used with SimDesigner Structures Workbench and contains modal flexibility results for the part geometry. Frequency cases in the CATAnalysis document will reference the Modal Neutral File (MNF) that Adams/Solver uses.

To Activate a Flexible Body:• From the specification tree, right-click the moving part to make flexible, point to the name of the

part, and then select Activate Flexibility to go directly to the FEA tab on the Part Definition dialog box.

• Animation Visualization Mode Options:

To Swap a Flexible Body:1. In the CATAnalysis file text box, browse for a different CATAnalysis.2. In the Frequency Case text box, select the appropriate frequency case.

For the option: Do the following:Model Part as Flexible Select it if you want to activate all items in the tab.CATAnalysis file Do one of the following:

• Enter the name and path of CATAnalysis file with MNF results.

• Browse for the CATIA file.Frequency Case Select one of the loadcases within the CATAnalysis file that contain

MNF data.

For the option: Do the following:Rigid Visualize flexible parts with their default CATIA representation

(CATPart documents).

Linear stress/deformation

Visualize flexible parts with analysis images (CATAnalysis documents).

Automatically calculate during animation

Run "calculate stress" command automatically if needed when starting an animation.

SimDesigner Motion Flex GuideActivating a Flexible Body

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To Disable a Flexible Body:1. Clear the selection of Model Part as Flexible.2. SimDesigner Motion Workbench saves the information on the flexible body, but it does not use

it for the simulation.

Note: You must generate the modal frequency case by using the SimDesigner Motion Workbench option to export to a linear structure. Otherwise, SimDesigner Structures Workbench does not generate modal SimDesigner Motion Flex data when performing an analysis.

7Chapter 1: SimDesigner Motion Flex ReferenceAutomatically Creating Virtual Parts

Automatically Creating Virtual PartsWhen you select load-bearing surfaces, SimDesigner Motion Flex automatically creates virtual parts during the Export to Linear Structure process.

If connections do not have any load-bearing geometry specified, the Export to Linear Structures process alerts you and displays a list of such connections. You can then choose to Abort or Proceed. If you choose to proceed, you must manually create virtual parts for the remaining connections.

To Automatically Create Virtual Parts:1. Double-click the moving part icon to open the Moving Part Definition dialog box.2. Select the Loads tab. By default, the first connection with no load-bearing geometry is selected.3. Select one or more surfaces on the part geometry.

Feature names are displayed in the Load-bearing Geometry window.4. Select other connections and repeat step 3 for all connections.5. Select OK.6. From the contextual menu of the moving part, select Export to Linear Structure.

The CATIA session is switched over to SimDesigner Structures Workbench.

Note: Before you can do anything in SimDesigner Structures Workbench, geometry must have default mesh, material, and virtual parts.

SimDesigner Motion Flex GuideModeling Flexible Bodies

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Modeling Flexible BodiesThe following shows the process of modeling flexible bodies.

An example process flow is covered in the Flexible Body Tutorial.

9Chapter 1: SimDesigner Motion Flex ReferenceStress/Deformation History

Stress/Deformation HistoryWith SimDesigner Motion Flex, you can calculate the stress/deformation history of a component.

To Calculate the Stress/Deformation History:1. Simulate mechanism in SimDesigner Motion Workbench with flexible component, and then

generate motion simulation results.2. Open the CATAnalysis document that the flexible component references.3. Calculate the linear stress/deformation on the component by right-clicking on the center of mass

icon of a flexible part and selecting Calculate Stress.4. Right-click <name_of_result>, and then select Set as Current Case.5. Generate stress images by selecting the Von Mises Stress icon .6. In the PSN, expand SimDesigner Motion Flex Transient Results.7. Double-click Von Mises Stress (nodal values).

The Occurrences tab appears. 8. To see the stress contour at specific times during the simulation, select one row at a time from the

Occurrences tab.

SimDesigner Motion Flex GuideReviewing Results

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Reviewing Results SimDesigner Motion Flex extends the results you can already view in SimDesigner Motion Workbench. To ensure that you can view the results, you must be sure to enable the option named Display Stress and Deformation during Animation on any flexible body.

To create the stress and deflection results, you must animate the flexible body. Once you animate, SimDesigner Motion Workbench stores the results in the CATAnalysis document for each flexible part.

You can animate flexible bodies to see flexible part deformation and stress during mechanism movement.

To Animate a Flexible Body:• From the SD Motion menu, select SMO player.

If the player detects flex results for a moving part, it will replace the instance of the part in the assembly with the CATAnalysis referenced by the flex body. The FEA results will then be displayed for each time step.

You cannot directly modify the display of the FEA results (such as stress, deformation, or contour ranges) in the SimDesigner Motion Workbench player. You can modify the display from the CATAnalysis document. To learn about modifying the display, see the CATIA documentation for Generative Structural Analysis.

11Chapter 1: SimDesigner Motion Flex ReferenceStarting and Licensing SimDesigner Motion Flex

Starting and Licensing SimDesigner Motion Flex Start SimDesigner Motion Workbench and then start SimDesigner Motion Flex as explained next. Learn about SimDesigner Motion Workbench.

To License SimDesigner Motion Flex from SimDesigner Motion Workbench:1. From the Tools menu, select Options.2. Select Digital Mockup / SimDesigner Motion Workbench.3. Select the Licensing tab.4. Select SimDesigner Motion Flex License.5. Select OK.

SimDesigner Motion Flex GuideSupported Forces and Joints

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Supported Forces and JointsThe following tables list the forces and joints that you can apply directly to flexible bodies.

Forces Supported

* The joint's J marker (reference component) cannot be on a flexible body. (The floating marker cannot be on a flexible body).

Joints Supported

The Force: Supported in Adams/Solver (C++):BUSHING YesCONTACT NoJOINT FRICTION Yes*TRANSLATIONAL SFORCE YesROTATIONAL SFORCE YesTRANSLATIONAL SPRINGDAMPER YesROTATIONAL SPRINGDAMPER Yes

The Joint: Supported in Adams/Solver (C++):CONVEL YesCYLINDRICAL YesFIXED YesPLANAR YesRACKPIN YesREVOLUTE YesSCREW YesSPHERICAL YesTRANSLATIONAL YesUNIVERSAL YesGEAR YesCOUPLER YesCurve-curve NoMOTION Yes

13Chapter 1: SimDesigner Motion Flex ReferenceSupported Forces and Joints

Point-curve NoATPOINTORIENTATIONPARALLEL_AXESPERPENDICULARINLINEINPLANE

Yes

The Joint: Supported in Adams/Solver (C++):

SimDesigner Motion Flex GuideTheory of Flexible Bodies

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Theory of Flexible BodiesFor theoretical background on SimDesigner Motion Flex, see the following references:

• For a detailed derivation of the SimDesigner Motion Workbench model flexibility method, see the technical paper, Theoretical Background.

• For flexibility in multibody applications, refer to Shabana, A. A. Dynamics of Multibody Systems, Second Edition. John Wiley &Sons. 1998. (http://www.bestbookbuys.com/cgi-bin/bbb.cgi?ISBN=0521594464)

• For general information on modal methods for structural dynamics, refer to Craig, R.R. Structural Dynamics: An Introduction to Computer Methods. John Wiley & Sons. 1981. (http://www.bestbookbuys.com/cgi-bin/bbb.cgi?ISBN=0471044997)

http://www.bestbookbuys.com/cgi-bin/bbb.cgi?ISBN=0521594464

http://www.bestbookbuys.com/cgi-bin/bbb.cgi?ISBN=0471044997

Chapter 2: SimDesigner Motion Flex ExamplesSimDesigner Motion Flex Guide

2 SimDesigner Motion Flex Examples

Flexible Body Tutorial

Import Nastran Results Tutorial

SimDesigner Motion Flex GuideFlexible Body Tutorial

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Flexible Body TutorialIn this tutorial, you will learn how to perform a flexible-body analysis.

The model you will use is the four-bar model provided with SimDesigner Motion Workbench. You can find this model in the directory <install dir>\samples\4bar.

The mechanism consists of four assembly components, three moving links, and one grounded link. Several assembly constraints exist between the component’s mating holes and side faces.

This tutorial takes about one and a half hours to complete.

Defining the Motion Model

To Display the Motion Model:• From the 4bar folder in the MSC SimDesigner installation samples directory, open the file

Fourbar_tutorial.CATProduct.

17Chapter 2: SimDesigner Motion Flex ExamplesFlexible Body Tutorial

To Assign a Material to a Part:1. In the specification tree, expand the Link3 part branch and double-click Link3 (to switch to part-

modification mode).

2. From the CATIA toolbar, select the Apply Material button .3. Select the Metal tab, and then select Steel.4. On the screen, verify that Link3 is still selected, and then select Apply Material.5. Close the dialog box.6. Double-click Product1 to switch back to assembly mode.

To Set the View Mode:1. From the View menu, point to Render Style, and then select Customize View.2. Select Material, and then select OK.


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On the screen, you should see the part shaded as follows:

Next, you run the MSC SimDesigner shortcut to enable CATIA with the SimDesigner Motion workbench.

To Set the SimDesigner Motion Workbench:1. If your workbench is not already set to SimDesigner Motion Workbench (the SimDesigner

Motion button should be the first button displayed in the toolbar on the right), then activate the SimDesigner Motion Workbench from Start -> Digital Mockup -> SimDesigner Motion Workbench. You access the SimDesigner Motion Workbench functionality from the SD Motion menu or from the MSC SimDesigner toolbar.

2. To create the mechanism from the assembly constraints, from the SD Motion menu, select New Mechanism.

3. To map constraints and generate the model, select OK.

To Define the Motion:1. Double-click the cylindrical Joint.3 (from the specification tree or on the screen).


2. Set Motion On to Rotate Z.3. Set Motion Type to Acceleration.4. Set Constant Value to 360 deg/sec2.

5. Select OK.

You can now generate the flexible body data and make Link3 flexible.

Exporting a Part to SimDesigner Structures WorkbenchBefore you export Link3, you will create virtual parts for Joint.5 and Joint.6.


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To Create Virtual Parts:1. Right-click the mass symbol for Link3, point to Link3.1 object, and then select Definition.2. Select the Loads tab.3. Select Joint.5.4. In the modeling window, zoom in on Joint.5 and then select the inside cylinder.5. Repeat steps 3 and 4 for Joint.6. You might have to rotate the mechanism to be able to pick the

inside cylinder for Joint.6.6. Select OK.

To Export the Part:1. Right-click the mass symbol for Link3, point to Link3.1 object, and then select Export to

Linear Structure.


A dialog box prompts you to select if you want to create a new analysis or use an existing one.2. Select OK, to create a new analysis.

You will receive a message to create a virtual part for Joint.7. Because Joint.7 does not affect the loading conditions, you do not need to create a virtual part for it.

3. Select Yes to continue.4. Select SimDesigner Modal Analysis and then select OK.


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Performing a Modal AnalysisYou can now mesh and run the analysis.

To Perform a Modal Analysis:1. From the SD Structures toolbar, at the right, select the Mesh and Compute button 2. Verify that the All option is selected.3. Select OK.

• SimDesigner Structures Workbench meshes the model and performs the analysis.4. Once the analysis is completed, in the specification tree, right-click:

• Nodes and Elements and then select Hide/Show.• Properties.1 and then select Hide/Show.

5. Save the CATAnalysis using the default name.

Making a Part Flexible

To Make the SD Motion Part Flexible:1. Use the Window menu to return to the assembly document. 2. Right-click the Link3 center-of-mass symbol, point to Link3.1 object, and then select Activate

Flexibility. Alternatively, you can double-click the center-of-mass symbol and then select the FEA tab.

Note: SimDesigner Motion Workbench creates a special setting on the frequency analysis case to generate a modal flexibility neutral file (used by Adams/Solver), so that only by exporting a part from SimDesigner Motion Workbench you will be able to generate the required results. In the future, SimDesigner Structures Workbench may have the option to generate the MNF in the settings for the analysis case.


3. Select the Browse button to the right of the Analysis Document text box, and then select the file you just saved.• The frequency case should be automatically displayed.

4. Select OK.

Performing a Simulation

To Perform a Simulation:1. From the SD Motion menu, select Simulate.


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2. Select Start to run the simulation using the default 1 second and 60 frames.• A message dialog box appears when the simulation starts.

3. After the simulation has finished, close this dialog box.

Reviewing the ResultsBecause the motion icons do not move with the model, you can hide them by right-clicking the SimDesigner Motion Workbench branch in the specification tree, and then selecting Hide/Show.

To Review the Results:1. From the SD Motion menu, select SMO Player.

If SimDesigner Motion Workbench detects that a flexible body was part of the simulation, it computes the stress results from the analysis, and then stores the results in the CATAnalysis file. It then caches the stress values for each frame and allows you to animate with the values displayed.The animation player appears and you should see a meshed part replace the rigid link3 part.

2. To see how stress varies as the mechanism moves, select Play .

25Chapter 2: SimDesigner Motion Flex ExamplesImport Nastran Results Tutorial

Import Nastran Results TutorialIn this tutorial, you will learn how to Import of Nastran mesh & results from xdb for flex scenario.

The model that you will use is a diving board model provided with SimDesigner Motion Workbench. You can find this model in the directory <install dir>\samples\diving_board.CATProduct.

The mechanism consists of three assembly components, three moving links, and two grounded parts. Several assembly constraints exist between the components' mating faces.

This tutorial takes about one hour to complete.

Perform License setting

To Perform License Setting:1. Click Tool from the main menu and select Option to display the Options dialog.2. Select Analysis and Simulation, click the SimDesigner Licensing.3. Switch off the Composites (SCP).

SimDesigner Motion Flex GuideImport Nastran Results Tutorial

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4. Click OK.

Export the Part to the Structure Workbench

To Export the Part to the Structure Workbench:1. Right-click the mass symbol for Plank, point to Plank object, and then select Export to Linear

Structure.


2. A dialog box prompts you to select if you want to create a new analysis.

3. Select the SimDesigner Static Analysis case.


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Performing an Import Results

To Perform an Import Results:1. From the SD Gateway toolbar, at the right, select the Import Results button 2. Select the Unit System SI-m-N-K.3. Select Data Type Mesh and Result.4. Select the dboard.xdb file using Browse Button 5. Click OK.6. Save the CATAnalysis using the default name.

Making a Plank Part Flexible

To Make the SD Motion Part Flexible:1. Use the Window menu to return to the assembly document. 2. Right-click the Plank center-of-mass symbol, point to Plank object, and then select Activate

Flexibility. Alternatively, you can double-click the center-of-mass symbol and then select the FEA tab.

Note: A file named dboard.mnf must exist in the same directory as the dboard.xdb file in order to be used with flexible bodies. If the file is not present, the flexbody analysis will not work.


3. Select the Browse button to the right of the Analysis Document text box, and then select the file you just saved.

4. Select OK.

Performing a Simulation of the Diving Board

To Perform a Simulation:1. From the SD Motion menu, select Simulate.2. Select Start to run the simulation using the default 1 second and 40 frames.

• A message dialog box appears when the simulation starts. 3. After the simulation has finished, close this dialog box.

Reviewing the Results of the Diving BoardThe motion icons do not move with the model,hence you can hide them by right-clicking the SimDesigner Motion Workbench branch in the specification tree, and then selecting Hide/Show.


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To Review the Results:1. From the SD Motion menu, select SMO Player.

If SimDesigner Motion Workbench detects that a flexible body was a part of the simulation, it computes the stress results from the analysis, and then stores the results in the CATAnalysis file. It then caches the stress values for each frame and allows you to animate with the values displayed.The animation player appears and you should see a meshed part replace the Plank part.

2. To see how stress varies as the mechanism moves, select Play .



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MSC.Fatigue Quick Start Guide

I n d e xSimDesigner Motion Flex Guide

Index

Index

AActivating

flexible body, 5SimDesigner Motion Workbench, 16, 27

CCalculating stress/deformation history, 9CATAnalysis document, 10

DDefining

FE, 3motion model, 16, 27

EExporting

SimDesigner Structures Linear Workbench, 3

FFinite element modeling, 2Flexible bodies

about, 4activating, 5modeling, 8theory, 14

Flexible body tutorial, 16Forces supported, 12Frequency case, 5

GGenerative Structural Analysis, 3

JJoints supported, 12

LLicensing SimDesigner Motion Flex Workbench,

11

MMaking SMO part flexible, 22MNF, generating, 3, 5Modal neutral file, about, 5Modeling flexible bodies, 8

PPart

SimDesigner Structures Linear Workbench, exporting to, 3

Part Definition dialog, 5

RResults

SimDesigner Motion Flex Workbench extends, 10

SimDesigner Motion Workbench stores, 10Reviewing results, 24, 29

SSimDesigner Motion Flex Workbench

results, 10starting and licensing, 11uses, 2

SimDesigner Motion Workbench, activating flexibility in, 5

SimDesigner Motion Flex Guide

34

Simulation, performing, 23, 29Starting SimDesigner Motion Flex Workbench, 11Stress/deformation history, calculating, 9Supported forces and joints, 12

TTheory of flexible bodies, 14

VVirtual parts, creating automatically, 7

Documents

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