Transcription
Autodesk Inventor Nastran 2020User’s Manual
User’s Manual 2019 Autodesk, Inc. All rights reserved.Autodesk Inventor Nastran 2020Except as otherwise permitted by Autodesk, Inc., this publication, or parts thereof, may not be reproduced in any form, by anymethod, for any purpose.Certain materials included in this publication are reprinted with the permission of the copyright holder.TrademarksThe 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 trademarksbelong to their respective holders.DisclaimerTHIS PUBLICATION AND THE INFORMATION CONTAINED HEREIN IS MADE AVAILABLE BY AUTODESK, INC. “AS IS.”AUTODESK, INC. DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TOANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE REGARDING THESEMATERIALS.
User’s ManualTABLE OF CONTENTS1. INTRODUCTION . 131.1 About This Manual . 131.2 The Finite Element Method . 131.3 Other NASTRAN References . 131.4 Obtaining Technical Support . 132. AUTODESK INVENTOR NASTRAN FILE SYSTEM . 152.1 Model Input . 152.1.1 Model Initialization File . 162.1.2 Model Input File . 342.2 Model Output . 402.2.1 Model Results Output File . 422.2.2 Bulk Data Output File . 562.2.3 System Log File . 582.2.4 Model Status File . 612.2.5 Results Neutral Files . 652.2.5.1 Grid Point Displacement Vector Neutral File . 662.2.5.2 Grid Point Force Vector Neutral File. 672.2.5.3 Element Results Neutral File . 692.2.5.4 Grid Point Results Neutral File . 713. LINEAR BUCKLING ANALYSIS . 753.1 Introduction . 753.2 How to Setup a Model Input File for Linear Buckling Analysis . 753.3 Interpreting Results . 763.4 Assumptions and Limitations of Linear Buckling . 854. NORMAL MODES ANALYSIS . 874.1 Introduction . 874.2 How to Setup a Model Input File for Normal Modes Analysis . 874.3 Interpreting Results . 884.4 Rigid-Body Modes . 954.5 Direct Matrix Export and Import . 994.6 Model Reduction Using ASET . 1054.7 Model Reduction Using Component Mode Synthesis (Craig-Bampton Reduction). 1094.8 Model Reduction Using Superelements . 1164.9 Modal Database Storage and Retrieval . 1244.10 Modal Correlation . 1255. LINEAR TRANSIENT RESPONSE ANALYSIS . 1335.1 Introduction . 1335.1.1 Direct Transient Response Analysis . 1335.1.2 Modal Transient Response Analysis . 1355.2 How to Setup a Model Input File for Transient Response Analysis . 1385.2.1 Direct Transient Response . 1385.2.2 Modal Transient Response . 1385.2.3 Transient Load Definition . 1385.2.4 Integration Time Step. 139Autodesk Inventor Nastran 2020iii
User’s Manual5.2.5 Dynamic Data Recovery . 1405.3 Interpreting Results . 1415.4 Enforced Motion . 1546. SHOCK AND RESPONSE SPECTRUM ANALYSIS . 1596.1 Introduction . 1596.2 Generating Response Spectra Data . 1596.3 How to Setup a Model Input File for Response Spectrum Analysis –Spectrum Generation . 1616.3.1 Response Spectrum Definition . 1616.3.2 Response Spectrum Output . 1626.4 Interpreting Results . 1636.5 Application of Response Spectra Data. 1696.6 How to Setup a Model Input File for Response Spectrum Analysis –Modal Combination. 1716.6.1 Response Spectrum Application. 1716.6.2 Response Spectrum Input . 1726.7 Interpreting Results . 1736.8 Dynamic Design Analysis Method (DDAM). . 1806.9 Interpreting Results . 1817. FREQUENCY RESPONSE ANALYSIS . 1877.1 Introduction . 1877.1.1 Direct Frequency Response Analysis. 1887.1.2 Modal Frequency Response Analysis . 1897.2 How to Setup a Model Input File for Frequency Response Analysis . 1917.2.1 Direct Frequency Response . 1917.2.2 Modal Frequency Response . 1917.2.3 Frequency-Dependent Load Definition . 1917.2.4 Solution Frequencies . 1927.2.5 Dynamic Data Recovery . 1937.3 Interpreting Results . 1957.4 Enforced Motion . 2018. RANDOM RESPONSE ANALYSIS . 2078.1 Introduction . 2078.2 How to Setup a Model Input File for Random Response Analysis . 2108.3 Interpreting Results . 2119. COMPLEX EIGENVALUE ANALYSIS . 2199.1 Introduction . 2199.2 How to Setup a Model Input File for Complex Eigenvalue Analysis . 2219.3 Interpreting Results . 22210. LINEAR PRESTR
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
