Mechanical APDL Basic Analysis Guide - Ansys

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Chapter 8:The Time-History Postprocessor (POST26) 8.7.2.1. Interactive The "List Data" button of the variable viewer can be used to list up to six variables in the variable viewer. When listing complex data such as from a harmonic analysis, use the 'results to view' drop-down list on the right top corner of the variable viewer to indicate whether to printout "amplitude and phase angle" or "real and imaginary parts" in the listing. Select amplitude or phase to list “Amplitude and Phase Angle” results. Select real or imaginary to list “Real and Imaginary” results. You can restrict data being listed to a range of time or frequency. This and other listing controls are available through the "Lists" tab under Data Properties dialog. In addition to setting the range of time or frequency, this dialog also allows you to: • Control the number of lines before repeating headers on the listings. • Additionally print the extreme values of the selected. variables. • Specify printing every 'n'th data point. 8.7.2.2. Batch You can use the PRVAR command (Main Menu> TimeHist Postpro> List Variables) to list up to six variables in tabular form. This is useful if you want to find the value of a result item at a specific time or frequency. You can control the times (or frequencies) for which variables are to be printed. To do so, use one of the following: Command(s): NPRINT, PRTIME GUI: Main Menu> TimeHist Postpro> Settings> List You can adjust the format of your listing somewhat with the LINES command (Main Menu> TimeHist Postpro> Settings> List). A sample PRVAR output is shown below. Sample Output from PRVAR ***** ANSYS time-history VARIABLE LISTING ***** TIME 51 UX 30 UY UX UY .10000E-09 .000000E+00 .000000E+00 .32000 .106832 .371753E-01 .42667 .146785 .620728E-01 .74667 .263833 .144850 .87333 .310339 .178505 1.0000 .356938 .212601 1.3493 .352122 .473230E-01 1.6847 .349681 -.608717E-01 When a complex variable consists of real and imaginary parts, the PRVAR command lists both the real and imaginary parts by default. You can work with real and imaginary, or amplitude and phase angle using the PRCPLX command. Another useful listing command is EXTREM (Main Menu> TimeHist Postpro> List Extremes), which prints the maximum and minimum Y-variable values within the active X and Y ranges. You can also assign these extreme values to parameters using the *GET command (Utility Menu> Parameters> Get Scalar Data). A sample EXTREM output is shown below. 202 Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
Sample Output from EXTREM time-history SUMMARY OF VARIABLE EXTREME VALUES VARI TYPE IDENTIFIERS NAME MINIMUM AT TIME MAXIMUM AT TIME 1 TIME 1 TIME TIME .1000E-09 .1000E-09 6.000 6.000 2 NSOL 50 UX UX .0000E+00 .1000E-09 .4170 6.000 3 NSOL 30 UY UY -.3930 6.000 .2146 1.000 8.8. Additional Time-History Postprocessing The following additional time-history postprocessing topics are available: 8.8.1. Random Vibration (PSD) Results Postprocessing 8.8.2. Generating a Response Spectrum 8.8.3. Data Smoothing 8.8.1. Random Vibration (PSD) Results Postprocessing Covariance and response PSD are of interest when postprocessing random vibration analysis results. The calculations use Jobname.rst and Jobname.psd files from a random vibration analysis. 8.8.1.1. Interactive To choose whether to compute the covariance or the response PSD when reviewing the results of a random vibration analysis, follow these steps: 1. Launch the variable viewer by selecting Main Menu> TimeHist Postpro. If the variable viewer is already open, click the Clear Time-History Data button, located in the toolbar. The Spectrum Usage dialog box appears. (See Figure 8.3 (p. 203).) 2. Select “Find the covariance of quantities” or “Create response power spectral density (PSD).” Note 3. Click OK. You can improve the “smoothness” of the response PSD curves by specifying the number of points on either side of a natural frequency point (STORE,PSD) with the slider, shown in Figure 8.3 (p. 203). Figure 8.3 Spectrum Usage Dialog Box 8.8.1.1.1. Covariance Follow these steps to calculate covariance using the variable viewer: 8.8.1. Random Vibration (PSD) Results Postprocessing Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 203
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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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Page 169 and 170: Sample PRETAB and SSUM Output *****
Page 171 and 172: 7.2.5. Mapping Results onto a Path
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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
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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 217: When plotting complex data such as
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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 247 and 248: 11.4. Controlling Miscellaneous Tex
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Page 259 and 260: 13.2.1.12. Vector Versus Raster Mod
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• Changing the contour interval.
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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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