Post processing

Add plot

You can create normal Simcenter Amesim plots special for design exploration plots when a study is in progress. This is very useful particularly with an automatic update applied to the plot because you can then observe the evolution of the study.

In addition you can create special plots specific for design exploration. The plot types available depend on the type of study and are described in Key features.

To add a plot:

• Select the study item in the study list and click the Add plot button.

• Right-click the study and select Add plot from the menu.

The Design Exploration Plots dialog box appears. See The Design Exploration Plots dialog box for more information.

Effect Table

The Effect Table applies to DOE Full factorial and Central composite. It is available only when the study execution is completed.

To display the effect table:

• Select the DOE Full factorial or Central composite study item in the study list and click Effect Table.

• Right-click the DOE Full factorial or Central composite study and select Effect Table from the menu.

The following dialog box appears:

Figure 64: Interaction table

This dialog box displays the mean effect of the variation of each input (or pair of inputs) on each output. Using the Save to file button you can save the contents of this window to an ASCII file. In the case displayed in the previous figure, the contents of the file is:

Statistics

To display the statistics table, right-click on the study item in the study list and select Statistics from the menu.

The following dialog box appears:

Statistics table

Figure 65: Statistics table

For each input, this dialog box gives the input and output, the mean value, the Statistics standard deviation standard deviation, the skewness and the Statistics Kurtosis Kurtosis.

For a random variable X, the formulae applied to get these results are:

Using the Save to file button you can save the contents of that window to an ASCII file. In the case displayed in the following figure, the contents of the file is:

Figure 66: Contents of the file

Log file viewer

Log file viewer

During the execution of a study, Simcenter Amesim performs a sequence of runs, changing the model parameters for each run and reading and post-processing the results. For each run, the values of model inputs and outputs are stored in a log file.

To display this file, right-click on a study item in the study list and select Log file in the menu.

The Log File Viewer appears:

Figure 67: Log file viewer for Optimization and Monte Carlo studies

The contents of this file depends on the technique used but it keeps the same structure whatever technique is chosen:

• The file header gives the list of inputs and outputs used in the corresponding study. It also summarizes of the type of study and gives the starting date of the study.

• The run sequences: each line contains the inputs used for the runs and the corresponding outputs. For Optimization and Monte Carlo studies, at the beginning of each line, a character indicates the status of the run. The characters are:

0 if the run fails

1 if the run succeeds

b if the run succeeds and is the best of all the runs completed so far (used only with a Genetic algorithm).

In the case of a Design Of Experiments study, the first column indicates the number of each run. Figure 68: Log file viewer for a Design Of Experiments study

• The file footer gives general information concerning study execution. Some error messages can appear here if the study cannot be completed. If the study is an optimization and has been processed successfully, the file footer also contains the best results obtained as shown in the following figure. Figure 69: Best result

For NLPQL optimization studies, not all the runs are stored in this file. In this case, one line corresponds to one iteration. The definition of iterations is given in NLPQL.

Response Surface Modeling

This subject is described in the following section, Response Surface Modeling.

Best results

Optimization best results

The aim of optimization studies is to determine best parameters which make a model reach a given goal. As mentioned in Main principles, the parameter settings used in the study are not automatically applied to the Simcenter Amesim model. If you return to Parameter mode you will find the parameters are unchanged.

However, in the case of an Optimization study you may want to apply the "best" parameters found in that study to your model. There is the two ways you can do this:

• Select the study item in the study list and click the Apply best results button.

• Right-click on the Optimization study item and select Apply best results from the menu.

Remember this is only available with Optimization studies. A study must have been completed successfully before using this action. Only the parameters involved in the study are applied to the system.