Page 200 - Using ANSYS for Finite Element Analysis Dynamic, Probabilistic, Design and Heat Transfer Analysis

Design optimization • 187
5.2.5.4 Restarting an optimization Analysis

To restart an optimization analysis, simply resume the optimization data-
base file (Jobname.OPT):
Command(s): OPRESU
GUI: Main Menu> Design Opt> Opt Database> Resume
Once the data is read in, you can respecify optimization type, con-
trols, and so on, and initiate looping. (The analysis file corresponding to
the resumed database must be available in order to perform optimization.)
To initiate looping:
Command(s): OPEXE
GUI: Main Menu> Design Opt> Run
You can use (Main Menu> Design Opt> Opt Database> Resume)
in an interactive session to resume optimization data. If there is data in
the optimization database at the time you want to resume, you should
first clear the optimization database. To clear the optimization database:
Command(s): OPCLR
GUI: Main Menu> Design Opt> Opt Database> Clear & Reset
Since the ANSYS database is not affected by the OPCLR command,
it may also be necessary to clear the ANSYS database if the resumed
optimization problem is totally independent of the previous one. To clear
the ANSYS database:
Command(s): /CLEAR
GUI: Utility Menu> File> Clear & Start New

5.2.6 SAMPLe oPTiMizATion AnALySiS

In the following example, you will perform an optimization analysis of a
hexagonal steel plate using the GUI for the analysis.
Problem Description: You will build a parametric model of a hexagonal
steel plate, using thickness t and fillet radius fil as the parameters. All other dimen-
1
sions are fixed. This example uses a 2-D model and takes advantage of symmetry.
Problem Specifications: The loading for this example is tensile pres-
sure (traction) of 100 MPa at the three flat faces.
The following material properties are used for this analysis: Thickness
= 10 mm
Young’s modulus (E) = 2.07e5 MPa
Poisson’s ratio (υ) = 0.3

1. Test analysis file
To test the analysis file, you clear the database and then read input
from the hexplate.lgw file.