How could I connect simulink model to the genetic algorithm toolbox ?

Hi, I am currently working on suspension system optimization via Genetic Algorithm. As the suspension model is in Simulink Interface, I couldn't find a way to connect simulink variables with the Population generated by genetic algorithm toolbox. Kindly help me with this.

[wenlong Ma]

i have the same Problem with you , do you find solution ? could you please tell me something about it ? or could you send me an mail : [e-mail]

[Andrea Valletta]

Is it possible for you to share the solution? I am currently unsuccesful to run the GA algorithm starting from the matlab script. ga function calls the objective function within which the simulink is started, as shown by Sebastian.

Thanks in advance

Answer 1

[Sebastian Castro]

It's all in your cost function. For example:

function cost = costFunction(params)

    myValue1 = params(1);
    myValue2 = params(2);

    % NOTE: This assumes the Simulink model has blocks that 
    % require variables named 'myValue1' and 'myValue2'
    outputs = sim('modelName',<options>);

    cost = <some_calculation>(outputs);

end

Hope this helps!

- Sebastian

[Alberto Mora]

I did what you suggested but it seems that the function workspace cannot send the updated design variable to the Simulink workspace.

Therefore I solved the problem, as you can see below.

function cost = costFunction(params)
    myValue1 = params(1);
    myValue2 = params(2);
    
    hws = get_param('modelName','modelworkspace'); % Handle the model's workspace
    hws.DataSource = 'MAT-File';
    hws.FileName = 'workspace';
    hws.assignin('myValue1', myValue1);hws.assignin('myValue2', myValue2);% Send to Simulink the updated variables
    
    % NOTE: This assumes the Simulink model has blocks that 
    % require variables named 'myValue1' and 'myValue2'
    outputs = sim('modelName',<options>);
    cost = <some_calculation>(outputs);
end

It works, but I am not sure that it is the most efficient way to overcome the problem. What do you think about that?

Thanks,

Alberto

[Jarin Tasnim]

@Alberto Mora hi, I am trying to optimize my simulink battery model parameters with genetic algorithm. Can I see your full matlab code from where the cost function is being called? I have written the cost function but I am facing some errors. It would be a great help! Thanks!

Jarin