Mechanical APDL Basic Analysis Guide - Ansys

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Chapter 8:The Time-History Postprocessor (POST26) 1. Select “Find the covariance of quantities” from the Spectrum Usage dialog box and click OK. Note If you have performed RPSD calculations, click the Clear Time-History Data button to load the Spectrum Usage dialog box. 2. Using the Variable Viewer, define the variables between which covariance is to be calculated. 3. Specify a variable in the variable name input area of the variable viewer. The name must be unique or you will be asked to overwrite the existing variable. 4. Click the CVAR button in the calculator area of the variable viewer. The following dialog box appears. 5. Select the variables to operate on from one or both of the pull down lists (corresponds to the IA,IB argument for the CVAR command). 6. Select the type of response to be calculated (corresponds to the ITYPE argument for the CVAR command). 7. Choose whether to calculate the covariance with respect to the absolute value or relative to the base (corresponds to the DATUM argument for the CVAR command). 8. Click OK to save your preferences and close the dialog box. The function cvar(IA,IB,ITYPE,DATUM) will be displayed in the expression area of the calculator. 9. Click Enter in the calculator portion of the variable viewer to start the evaluation. When the evaluation is finished, the covariance value is stored; the variable name is displayed in the variable list area for further postprocessing. 8.8.1.1.2. Response PSD Follow these steps to calculate the Response PSD using the variable viewer. 1. Select “Create response power spectral density (PSD)” from the Spectrum Usage dialog box and click OK. 2. Using the Variable Viewer, define the variables for which the Response PSD is to be calculated. 3. Specify a variable in the variable name input area of the variable viewer. The name must be unique or you will be asked to overwrite the existing variable. 4. Click the RPSD button in the calculator area of the variable viewer. The following dialog box appears. 204 Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
5. Select the variables to be operated on (corresponds to the IA,IB argument for the RPSD command). 6. Select the type of PSD to be calculated (corresponds to the ITYPE argument for the RPSD command). 7. Choose whether to calculate the response PSD with respect to the absolute value or relative to the base (corresponds to the DATUM argument for the RPSD command). 8. Click OK to save your preferences and close the dialog box. The function rpsd(IA,IB,ITYPE,DATUM) will be displayed in the expression area of the calculator. 9. Click Enter in the calculator portion of the variable viewer to start the evaluation. When the evaluation is finished, the response PSD value is stored; the variable name is displayed in the variable list area for further postprocessing. 8.8.1.2. Batch Response PSDs and covariance values can be calculated for any results quantity using Jobname.RST and Jobname.PSD from a random vibration analysis. The procedure for performing this calculation is described in detail in Calculating Response PSDs in POST26 in the Structural <strong>Analysis</strong> <strong>Guide</strong>. 8.8.2. Generating a Response Spectrum This feature allows you to generate a displacement, velocity, or acceleration response spectrum from a given displacement time-history. The response spectrum can then be specified in a spectrum analysis to calculate the overall response of a structure. 8.8.2.1. Interactive Generating a response spectrum requires two previously-defined variables: one containing frequency values for the response spectrum (corresponding to the LFTAB argument for the RESP command), and the other containing the displacement time-history (corresponding to the LDTAB argument for the RESP command). The frequency values represent the abscissa of the response spectrum curve and the frequencies of the onedegree-of-freedom oscillators used to generate the response spectrum. You can create the frequency variable by using either the calculator portion of the variable viewer to define an equation or the variable viewer's import options. Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 8.8.2. Generating a Response Spectrum 205
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ANSYS Mechanical APDL Basic Analysi
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Table of Contents 1. Getting Starte
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2.8.4.3. Define Material Properties
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7.2.1.6. Particle Flow and Charged
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10. Getting Started with Graphics .
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13.2.4.1.Turning Load Symbols and C
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20.8. Reviewing Contents of Binary
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List of Tables 2.1. DOF Constraints
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Chapter 1: Getting Started with ANS
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shown below define two element type
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You can choose constant, isotropic,
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You can save linear material proper
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Figure 1.4 Material Model Interface
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Figure 1.7 Data Input Dialog Box -
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The first example below is intended
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9. Click on OK. The dialog box clos
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1.1.4.9. Reading a Material Library
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If you are performing a static or f
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Chapter 2: Loading The primary obje
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Figure 2.2 Transient Load History C
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The arc-length method is an advance
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• Transferred solid loads will re
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Note If the node rotation angles th
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Figure 2.7 Scaling Temperature Cons
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Below are examples of some of the G
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Utility Menu> List> Loads> Surface>
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Figure 2.9 Example of Surface Load
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the shell, and 270° to 360° for t
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Below are examples of some of the G
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Figure 2.15 Transfers to BFK Loads
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CASE C: At least one BFV, BFA, or B
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A handy way to specify density so t
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For more information, see Initial S
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Boundary Condition Heat Flux Film C
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This problem consists of a thermal-
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2.6. Specifying Load Step Options A
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- All loads changed in later load s
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Main Menu> Preprocessor> Loads> Loa
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Command GUI Menu Paths Main Menu> S
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! Load Step 1: D, ... ! Loads SF, .
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Modeling> Create> Elements> Auto Nu
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Figure 2.22 Pretension Section Samp
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cylind,0.35,1, 0.75,1, 0,180 wpstyl
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11. Select Utility Menu> PlotCtrls>
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24. Select Utility Menu> Plot> Comp
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Chapter 3: Using the Function Tool
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Hint: A common error is a divide-by
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3.3. Using the Function Loader When
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2. Define the convection boundary c
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7. Optional: Enter comments for thi
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3.6.1. Graphing a Function From the
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Chapter 4: Initial State The term i
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inis,defi,,,1,,100,200,150 inis,def
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applies an equal stress of SX = 100
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4.7.2. Example: Initial Stress Prob
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inis,defi,all,all,all,all,0.1,,, in
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Chapter 5: Solution In the solution
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Solver Typical Applications * In to
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used. Running the distributed spars
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With all iterative solvers, be part
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5.3.3. Disk Space (I/O) and Postpro
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If your analysis is either static o
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Note Whether you make changes to on
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Figure 5.2 PGR File Options From th
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GUI: Main Menu> Solution> Current L
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Figure 5.3 Examples of Time-Varying
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Requirements for Performing an Anal
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*dim,temtbl,table,4,1,,time ! Defin
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5.9.1.1.1. Multiframe Restart Limit
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prnsol finish 5.9.2. VT Accelerator
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5.12. Stopping Solution After Matri
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Chapter 6: An Overview of Postproce
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each element. Derived data are also
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Chapter 7: The General Postprocesso
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Although not required for postproce
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The ETABLE command documentation li
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• Path plots • Reaction force d
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The PLETAB command contours data st
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PLDISP,1 ! Deformed shape superimpo
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7.2.1.6. Particle Flow and Charged
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• Particle flow traces occasional
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The surfaces you create fall into t
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You can opt to archive all defined
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19 41.811 51.777 .00000E+00 -66.760
Page 169 and 170: Sample PRETAB and SSUM Output *****
Page 171 and 172: 7.2.5. Mapping Results onto a Path
Page 173 and 174: Command(s): PDEF GUI: Main Menu> Ge
Page 175 and 176: To retrieve path information from a
Page 177 and 178: 7.2.6. Estimating Solution Error On
Page 179 and 180: Write Results - You can use the dat
Page 181 and 182: NOTE: When you append data to your
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Page 185 and 186: Figure 7.20 The PGR File Options Di
Page 187 and 188: 7.4.8. Comparing Nodal Solutions Fr
Page 189 and 190: the effect of the rigid body rotati
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Page 193 and 194: To view correct mid-surface results
Page 195 and 196: To get usable results combine the r
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Page 201 and 202: 7.4.8.1. Matching the Nodes The Mec
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Page 205 and 206: Chapter 8: The Time-History Postpro
Page 207 and 208: enables the alternate selections sh
Page 209 and 210: 1. Click on the Add Data button. Re
Page 211 and 212: APPEND Appends data to previously s
Page 213 and 214: !derivative of variable 2 with resp
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Page 227 and 228: Note Crossover commands for selecti
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Page 239 and 240: • If the environment variable SB_
Page 241 and 242: 10.5.5. Erasing the Current Display
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Page 259 and 260: 13.2.1.12. Vector Versus Raster Mod
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14.5. Isosurface Techniques Isosurf
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Chapter 15: Creating Graphs If you
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Establishing separate Y-axis scales
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15.2.3.5. Defining the TIME (or, Fo
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Chapter 16: Annotation A common ste
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16.3. 3-D Annotation 3-D text and g
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Chapter 17: Animation Animation is
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• ANMODE (Utility Menu> PlotCtrls
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Figure 17.2 The Animation Controlle
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Note If you are doing animation fro
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Chapter 18: External Graphics Besid
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18.1.4. Exporting Graphics in UNIX
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Note The commands discussed in this
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18.3.6. Editing the Neutral Graphic
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Chapter 19: The Report Generator Th
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2. Specify a caption for the captur
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19.4.1.1. Creating a Custom Table I
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Table ID 46 47 48 Description Compo
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Button or Field DYNAMIC DATA REPORT
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The HTML tag to begin JavaScript co
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listingName A unique listing name a
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Chapter 20: File Management and Fil
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20.4. Text Versus Binary Files Depe
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Identifier ELEM EMAT ERR ESAV FATG
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20.4.3. File Compression Many file
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You can also redirect graphics outp
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Chapter 21: Memory Management and C
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21.3.3. Changing Database Space Fro
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Figure 21.4 Dividing Work Space ANS
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NUM_BUFR is the number of buffers p
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een chosen for efficient running of
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Index Symbols 3-D graphics devices,
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path plots, 142 POST26 graphs, 200
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fatigue graphs, 257 files, 277 focu
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material model interface, 8 materia
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multiframe, 117 restarting an analy
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WINDOW command, 227 Windows graphic
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