Simulation does not respond to changing block parameters while simulation using set_param function method

Question

Vatan 2023-10-13

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回答： Animesh 2023-10-30

Hello,

I am using mutual inductance block to model multiple coupled coils. The mutual inductances of the coil are needed to be changed with time. I have used the set_param function method to change the mutual inductance block parameters. As I run the simulation I can see the block paramters change but the simulation does not respond to the changing parameters. The simulation runs taking in only the initialization parameters. Is there a problem in the way that I am executing the set_param function or this method wouldn't allow me to change block parameters of non signal blocks?

My simulation parameters:

solver type: discrete, step time: (1e-7)

solver: runge-kutta

simulation time: 200 msecs

Following is the set_param script which is executed in a matlab function block in simulink

function ChangeParam(k)
eml.extrinsic('set_param');
eml.extrinsic('mat2str');
BlockName = 'simulation/Hardware/tx_rx/Mutual_Inductance';
BlockParameter = 'InductanceMatrix';
L_Tx =    1.0e-04 *[ 0.2891   -0.0360   -0.0360;
    -0.0360    0.3298   -0.0216;
    -0.0360   -0.0216    0.3298];
%setting up the self inductance matrix of Rx (3x3)
L_Rx =    1.0e-04 *[ 0.3766   -0.1114   -0.1114;
    -0.1114    0.4572   -0.0713;
    -0.1114   -0.0713    0.4572];
%setting up the mutual inductance matrix of Tx-Rx (3x3)
L_TR = k*1.0e-05 *[ 0.1765   -0.1956   -0.1957;
    -0.1162    0.4378   -0.0213;
    -0.1162   -0.0213    0.4378];
% Forming a composite self+mutual inducatnce matrix (6x6)
L_Tx_Rx1 = [L_Tx, L_TR; L_TR', L_Rx];
StringValue = mat2str(L_Tx_Rx1);
set_param('simulation/Hardware/tx_rx/Mutual_Inductance','InductanceMatrix',StringValue);

The following is the mutual indictance block that I am using and want to change the block parameters of,

Following is the blok parameter window, I am changing the inductance matrix block parameter.

Thank you!

Vatan Mehar

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Paul 2023-10-13

Hi Vatan,

I don't change block parameters during simulation, but doesn't the diagram need to be updated after the parameters are changed via set_param? I don't really know for sure.

Also, this blog post may be of interest.

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Answer 1

Animesh 2023-10-30

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Hello @Vatan,

According to my understanding, you are unable to update parameter value for a block while running a simulation.

I am not sure why you are unable to update the value of “Inductance Matrix” using “set_param”, you can try updating the model after using “set_param”.

Example update command :-

set_param(modelname,'SimulationCommand','Update')

To read more about “set_param”, refer to the following document :-https://www.mathworks.com/help/simulink/slref/set_param.html