Kelly L. Murdock's Autodesk - 3ds Max 2020
Although the Autodesk® 3ds Max® 2020 software consists of many different interface elements such as panels
Autodesk Inventor Nastran 2020 User's Manual
Autodesk Inventor Nastran 2020. User's Manual 123D 3ds Max
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Autodesk Inventor Nastran 2020
© 2019 Autodesk, Inc. All rights reserved.
Autodesk® Inventor® Nastran® 2020
Except as otherwise permitted by Autodesk, Inc., this publication, or parts thereof, may not be reproduced in any form, by any
method, for any purpose.Certain materials included in this publication are reprinted with the permission of the copyright holder.
Trademarks
The following are registered trademarks or trademarks of Autodesk, Inc., and/or its subsidiaries and/or affiliates in the USA and other countries:
123D, 3ds Max, Alias, ATC, AutoCAD LT, AutoCAD, Autodesk, the Autodesk logo, Autodesk 123D, Autodesk Homestyler, Autodesk Inventor,
Autodesk MapGuide, Autodesk Streamline, AutoLISP, AutoSketch, AutoSnap, AutoTrack, Backburner, Backdraft, Beast, BIM 360, Burn,
Buzzsaw, CADmep, CAiCE, CAMduct, Civil 3D, Combustion, Communication Specification, Configurator 360, Constructware, Content Explorer,
Creative Bridge, Dancing Baby (image), DesignCenter, DesignKids, DesignStudio, Discreet, DWF, DWG, DWG (design/logo), DWG Extreme,
DWG TrueConvert, DWG TrueView, DWGX, DXF, Ecotect, Ember, ESTmep, Evolver, FABmep, Face Robot, FBX, Fempro, Fire, Flame, Flare,
Flint, ForceEffect, FormIt, Freewheel, Fusion 360, Glue, Green Building Studio, Heidi, Homestyler, HumanIK, i-drop, ImageModeler, Incinerator,
Inferno, InfraWorks, InfraWorks 360, Instructables, Instructables (stylized robot design/logo), Inventor, Inventor HSM, Inventor LT, Lustre, Maya,
Maya LT, MIMI, Mockup 360, Moldflow Plastics Advisers, Moldflow Plastics Insight, Moldflow, Moondust, MotionBuilder, Movimento, MPA
(design/logo), MPA, MPI (design/logo), MPX (design/logo), MPX, Mudbox, Navisworks, ObjectARX, ObjectDBX, Opticore, Pixlr, Pixlr-o-matic,
Productstream, Publisher 360, RasterDWG, RealDWG, ReCap, ReCap 360, Remote, Revit LT, Revit, RiverCAD, Robot, Scaleform, Showcase,
Showcase 360, SketchBook, Smoke, Socialcam, Softimage, Sparks, SteeringWheels, Stitcher, Stone, StormNET, TinkerBox, ToolClip,
Topobase, Toxik, TrustedDWG, T-Splines, ViewCube, Visual LISP, Visual, VRED, Wire, Wiretap, WiretapCentral, XSI.
NASTRAN® is a registered trademark of the National Aeronautics Space Administration. All other brand names, product names or trademarks
belong to their respective holders.Disclaimer
AUTODESK, INC. DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE REGARDING THESEMATERIALS.
Autodesk Inventor Nastran 2020 iii
TABLE OF CONTENTS
1. INTRODUCTION ............................................................................................................................... 13
1.1 About This Manual ............................................................................................................................... 13
1.2 The Finite Element Method ................................................................................................................. 13
1.3 Other NASTRAN References .............................................................................................................. 13
1.4 Obtaining Technical Support .............................................................................................................. 13
2. AUTODESK INVENTOR NASTRAN FILE SYSTEM ......................................................................... 15
2.1 Model Input ........................................................................................................................................... 15
2.1.1 Model Initialization File ................................................................................................................. 16
2.1.2 Model Input File ............................................................................................................................ 34
2.2 Model Output ........................................................................................................................................ 40
2.2.1 Model Results Output File ............................................................................................................ 42
2.2.2 Bulk Data Output File .................................................................................................................... 56
2.2.3 System Log File ............................................................................................................................ 58
2.2.4 Model Status File .......................................................................................................................... 61
2.2.5 Results Neutral Files ..................................................................................................................... 65
2.2.5.1 Grid Point Displacement Vector Neutral File ............................................................................. 66
2.2.5.2 Grid Point Force Vector Neutral File .......................................................................................... 67
2.2.5.3 Element Results Neutral File ..................................................................................................... 69
2.2.5.4 Grid Point Results Neutral File .................................................................................................. 71
3. LINEAR BUCKLING ANALYSIS ....................................................................................................... 75
3.1 Introduction .......................................................................................................................................... 75
3.2 How to Setup a Model Input File for Linear Buckling Analysis ...................................................... 75
3.3 Interpreting Results ............................................................................................................................. 76
3.4 Assumptions and Limitations of Linear Buckling ............................................................................ 85
4. NORMAL MODES ANALYSIS .......................................................................................................... 87
4.1 Introduction .......................................................................................................................................... 87
4.2 How to Setup a Model Input File for Normal Modes Analysis ......................................................... 87
4.3 Interpreting Results ............................................................................................................................. 88
4.4 Rigid-Body Modes ................................................................................................................................ 95
4.5 Direct Matrix Export and Import ......................................................................................................... 99
4.6 Model Reduction Using ASET .......................................................................................................... 105
4.7 Model Reduction Using Component Mode Synthesis (Craig-Bampton Reduction) ................... 109
4.8 Model Reduction Using Superelements .......................................................................................... 116
4.9 Modal Database Storage and Retrieval ........................................................................................... 124
4.10 Modal Correlation ............................................................................................................................. 125
5. LINEAR TRANSIENT RESPONSE ANALYSIS ............................................................................... 133
5.1 Introduction ........................................................................................................................................ 133
5.1.1 Direct Transient Response Analysis ........................................................................................... 133
5.1.2 Modal Transient Response Analysis .......................................................................................... 135
5.2 How to Setup a Model Input File for Transient Response Analysis ............................................. 138
5.2.1 Direct Transient Response ......................................................................................................... 138
5.2.2 Modal Transient Response ......................................................................................................... 138
5.2.3 Transient Load Definition ............................................................................................................ 138
5.2.4 Integration Time Step.................................................................................................................. 139
Autodesk Inventor Nastran 2020 iv
5.2.5 Dynamic Data Recovery ............................................................................................................. 140
5.3 Interpreting Results ........................................................................................................................... 141
5.4 Enforced Motion ................................................................................................................................. 154
Autodesk Inventor Nastran 2020
© 2019 Autodesk, Inc. All rights reserved.
Autodesk® Inventor® Nastran® 2020
Except as otherwise permitted by Autodesk, Inc., this publication, or parts thereof, may not be reproduced in any form, by any
method, for any purpose.Certain materials included in this publication are reprinted with the permission of the copyright holder.
Trademarks
The following are registered trademarks or trademarks of Autodesk, Inc., and/or its subsidiaries and/or affiliates in the USA and other countries:
123D, 3ds Max, Alias, ATC, AutoCAD LT, AutoCAD, Autodesk, the Autodesk logo, Autodesk 123D, Autodesk Homestyler, Autodesk Inventor,
Autodesk MapGuide, Autodesk Streamline, AutoLISP, AutoSketch, AutoSnap, AutoTrack, Backburner, Backdraft, Beast, BIM 360, Burn,
Buzzsaw, CADmep, CAiCE, CAMduct, Civil 3D, Combustion, Communication Specification, Configurator 360, Constructware, Content Explorer,
Creative Bridge, Dancing Baby (image), DesignCenter, DesignKids, DesignStudio, Discreet, DWF, DWG, DWG (design/logo), DWG Extreme,
DWG TrueConvert, DWG TrueView, DWGX, DXF, Ecotect, Ember, ESTmep, Evolver, FABmep, Face Robot, FBX, Fempro, Fire, Flame, Flare,
Flint, ForceEffect, FormIt, Freewheel, Fusion 360, Glue, Green Building Studio, Heidi, Homestyler, HumanIK, i-drop, ImageModeler, Incinerator,
Inferno, InfraWorks, InfraWorks 360, Instructables, Instructables (stylized robot design/logo), Inventor, Inventor HSM, Inventor LT, Lustre, Maya,
Maya LT, MIMI, Mockup 360, Moldflow Plastics Advisers, Moldflow Plastics Insight, Moldflow, Moondust, MotionBuilder, Movimento, MPA
(design/logo), MPA, MPI (design/logo), MPX (design/logo), MPX, Mudbox, Navisworks, ObjectARX, ObjectDBX, Opticore, Pixlr, Pixlr-o-matic,
Productstream, Publisher 360, RasterDWG, RealDWG, ReCap, ReCap 360, Remote, Revit LT, Revit, RiverCAD, Robot, Scaleform, Showcase,
Showcase 360, SketchBook, Smoke, Socialcam, Softimage, Sparks, SteeringWheels, Stitcher, Stone, StormNET, TinkerBox, ToolClip,
Topobase, Toxik, TrustedDWG, T-Splines, ViewCube, Visual LISP, Visual, VRED, Wire, Wiretap, WiretapCentral, XSI.
NASTRAN® is a registered trademark of the National Aeronautics Space Administration. All other brand names, product names or trademarks
belong to their respective holders.