Parameter sweep using simscape

I am trying to use Simscape to model the simple cross-over filter below.

Using the linearisation tool box I am able to extract its state-space representation and plot its transfer function. I would like to run a parameter sweep where I vary the inductance of Ind1.

I have managed to get this working, but the simulation has to recompile everytime it is linearised. When I use the fastRestartForLinearAnalysis( ) function (taken fropm the example in https://uk.mathworks.com/help/slcontrol/ug/fastrestartforlinearanalysis.html) the model no longer recompiles with each iteration, but the variable L_LP doesnt seem to get updated anymore... How can I avoid recompiling the model everytime, whilst still varying parameter values?

The main peice of code I am using is given below.

set_param('test1/Ind1','L','L_LP');
L_LP = 1e-3;

% fastRestartForLinearAnalysis(mdl,'on')
for n = 1:100
    L_LP = L_LP + 0.0001 ; % Value of an inductor in circuit
    
%     Simulink.Block.eval('test1/Ind1')
    
    linsys = linearize(mdl,io);
    
    [magLP(n,:), phaseLP(n,:)] = bode(linsys(1),w);
end
% fastRestartForLinearAnalysis(mdl,'off');

Answer 1

[Juan Sagarduy]

Hi Joshua

Is the inductance parameter set as Run-time in the Simscape component? By default it is not, so maybe you can check this and test out.

https://se.mathworks.com/help/physmod/simscape/run-time-parameters.html

Regards / Juan

[Joshua W R Meggitt]

Hi Juan,

Thanks for the suggestion. I wasnt aware of run-time parameters in simscape, they certainty look relevent.

Unfortuantely, after setting the inductance parameter to run-time, I am having the same issue. With each iteration the inductance variable updates in the workspace, but when I linearise the model nothing seems to change. Where as if i recompile between lineartisations I get the expected spread of bode plots.

Any other suggestions would be welcome!

BR

Josh