Mechanical APDL Basic Analysis Guide - Ansys

Chapter 8:The Time-History Postprocessor (POST26)
# The next line can either be left blank or have descriptors for each column
# such as REAL and IMAGINARY
#
# The data itself can be in free format with the columns "comma delimited",
# "tab delimited", or "blank delimited"
#
# The first column of data is always reserved for the independent variable
# (usually TIME or FREQUENCY)
#
FREQ TEST1 TEST2
REAL IMAGINARY REAL IMAGINARY
1.00000E-02 -128.32 0.17764 5.6480 -4.47762E-03
2.00000E-02 -150.08 0.36474 5.6712 -8.99666E-03
3.00000E-02 -163.12 0.57210 5.7097 -1.35897E-02
4.00000E-02 -147.63 0.81364 5.7629 -1.82673E-02
5.00000E-02 -133.90 1.1091 5.8298 -2.29925E-02
6.00000E-02 -172.38 1.4886 5.9080 -2.76290E-02
The user has two choices, depending upon the data in the file.
• Graph overlay information: This can be used when you are interested in simply overlaying the experimental
or theoretical results on top of the Finite Element Analysis results in the same plot. The data
set(s) brought in using this method will show up in the "overlay data" drop down list. A data set selected
in this drop down list will overlay the current variable graph display. You will need to choose "None"
to not overlay the data. The sets of data brought in using this method can be overlaid on a variable
graph, allowing a visual comparison of the test data against the finite element result.
• Linear interpolation into variables: If you want to compare Finite Element Analysis results with your
experimental or theoretical results at the same time points, you should use the Interpolate to FEA Time
Points option. This option linearly interpolates the test data to calculate test results at the ANSYS
time/frequency points. The interpolated data is then stored as a time-history variable(s) and is added
to the list of variables in the variable viewer. These variables can then be displayed, listed, or operated
on as any other time-history variable. You must ensure that linear interpolation is valid for the data
imported. In addition, the non-interpolated “raw” data from the file is available in the “overlay data”
drop down list, as explained above.
8.5.2. Batch Mode
You import data from a file into a time history variable using one of the following methods:
• Use the DATA command to read in a pre-formatted file. The file should be in Fortran format as described
in the DATA command.
• Read the data from a free format, "comma," “blank,” or "tab" delimited file. You can store it as a time
history variable using the two step procedure below:
1. Read the file into a table array using the *TREAD command. This step requires that you know the
number of data points in the file since you will need to prespecify the table array size ( *DIM ).
2. Use the VPUT command to store the array into a time history variable. You can store one array at
a time into a time history variable
• The following two 'external' commands are available to facilitate easy import of data into time-history
variables.
198
1. ~eui, 'ansys::results::timeHist::TREAD directorypath/filename arrayname'
The above command will determine the size of the data file, create a table array of name 'arrayname',
appropriately dimension it based on the number of data sets in the file, and then read the data
into this array. This command must be issued prior to the command shown below.
2. ~eui,'ansys::results::timeHist::vputData arrayname variablenumber'
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