eldo_user

Optimization
Post-Analysis of Optimization Simulations
Post-Analysis of Optimization Simulations
After the optimization has been conducted, the next step is to recognize whether it has
succeeded in its task of finding a solution.
The only way to check for success is to measure optimality and feasibility at the final solution.
If the optimality measure is less than the specified tolerance, the current point is considered as
optimal. For more information please refer to “Role of Tolerances in the Eldo Optimizer SQP
Method” on page 624.
This can be accomplished by analyzing the results of the optimization. There are two areas to be
analyzed:
• Whether the current set of variables are a solution to the problem. If the optimal
conditions are not satisfied, these may provide some useful information on how the
current estimate of the solution can be improved. Think of this as a global score of the
optimization run.
• The values of the extracted measures printed at the end of the process. This represents
the post-optimization analysis.
This section explains:
Output from the Optimization Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 639
Explicitly Declaring Results For Graphical Viewing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 641
Viewing the ASCII Output File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 642
ASCII Optimization File Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 643
Monitoring Design Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 653
Final Diagnostic Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 656
Normal and Elastic Modes of Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 659
Output from the Optimization Process
The results of an optimization are provided in two ways, ASCII and graphical outputs:
• ASCII Output (.otm)
The .otm optimization output file is useful for recognizing whether an optimization has
succeeded in its task of finding a solution. It is a structured text file separated into
sections and subsections. It uses a technique known as folding, enabling you to filter out
one or more sections. You can get a better overview of the results text by folding lines of
a section to omit them.
By default, the output file is generated in the same directory from where eldo is run and
is named .otm, where is the name of the simulation
command file.
Eldo® User's Manual, 15.3 639