Mechanical APDL Structural Analysis Guide

Postprocessing operations read your data from the results file. Only the solution data you SAVE will be
available if you resume the database after a SOLVE.

6.6.3.1. Reviewing the Results in POST1.

To review results in POST1, you first need to understand how the results data are organized on the
results file.Table 6.4: Organization of Results Data from a PSD Analysis (p. 165) shows the organization.

Note

Load step 2 is left blank if you specify only nodal PSD excitation. Also, if you suppress the

displacement, velocity, or acceleration solution using the PSDRES command, the correspond-

ing load step is left blank. Also, the superelement displacement file (.DSUB) is not written

for load steps 3, 4, or 5 in a PSD analysis.

Table 6.4: Organization of Results Data from a PSD Analysis

Load Step Substep Contents

1 1 Expanded modal solution for 1st mode

2 Expanded modal solution for 2nd mode

3 Expanded modal solution for 3rd mode

Etc. Etc.

2 (Base ex- 1 Unit static solution for PSD table 1

cit. only) 2 Unit static solution for PSD table 2

Etc. Etc.

3 1 1 sigma displacement solution

4 1 1 sigma velocity solution (if requested)

5 1 1 sigma acceleration solution (if requested)

6.6.3.1.1. Read the Desired Set of Results into the Database

For example, to read in the 1 σ displacement solution, issue the command:

SET,3,1

You may use Fact on the SET command to multiply the result values to obtain, for example, the 2 σ
values using Fact=2 (the response will be less than these 2 σ values 95.4% of the time), or use Fact=3
for the 3 σ values (99.7% of the time).
Command(s):SET
GUI: Main Menu> General Postproc> Read Results> First Set

Release 15.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information

Performing a Random Vibration (PSD) Analysis