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How can I use "Diagram" variable for optimization

I made a variable in 'Diagram'

An I want to use this variable as an design variable for optimization like below.

How can I do this?

it looks like 'From Bas k' block can't import 'Diagram' variable and also it is not possible to change the 'k' variable in SineWave Generator during optimization.

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RoKet

Hi Seoksan,

'From Base' has to be used with 'To Base', they form a kind or pair. The variable is placed in base scope, not in 'Model' scope. You can see the variable in the 'Variable Browser', whereas 'Model' variables are not visible in the 'Variable Browser'.

The demos in 'tutorial_models - Extended_Book_Models - Chapter_5_Optimization' show the usage of design variables for optimization.

I hope that helps, regards,
Ronald

Altair Forum User

I saw that file also.

I know the design variables are from 'From Base' with initial values => Then it is used at 'Set signal', 'Get signal' and etc.

Here are the data flow ; please see the below picture.

But in that model, the design variables are not used at block parameters.

What I want to know

- set the variable at 'Model' or 'Diagram' ; for example, k=3

- use the k variable in the block parameter ; k is used in sinewave generator block

- And use k variable as design variables for optimization block.

=> then the k will be changed and sinewave generator will be changed also during the optimization iteration works

How can I make it?

<?xml version="1.0" encoding="UTF-8"?>

RoKet

I see. That's the typical task of optimizing a parameter e. g. of a controller. But I can't find a way to set a Model variable without beeing reset at next simulation run. My idea was to use 'From Base' and 'To Base' with optimization block and write the result back to model variable with the custom block. But the definition in Model scope overwrite every change of the variable at initialization.

Does someone else know a solution?

RoKet

I found the solution at one of Thierry's demo model. The optimization block is communicating with Base variables, but you can read these variables in the Model context using

 ModelContextVariable = GetFromBase('BaseVariable',1);

or in your case

 k = GetFromBase('k',3);

The variables may have the same name.