ressistors with small random offset in SIMULINK

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Hello , I want to have 10 resistors with a littles offset in resistance by random number arounk 1kohm
i have itried to use matlab simuling VAriable ressistor.
But i dont see how i enter there some random offset in the value.
Thanks.
  11 Comments
fima v
fima v on 28 May 2020
Hello Wolter , i am not sure regarding what exact simulink i am using, ithink i have here RF blockset.
could you please say on this platform how to define random argument in the resistor value?
Thanks.

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Accepted Answer

Walter Roberson
Walter Roberson on 29 May 2020
Edited: Walter Roberson on 29 May 2020
The attached model is adapted (solver parameters updated) from the File Exchange Contribution
SERIES AND PARALLEL CIRCUITS, version 1.0.0, by Chaitanya Jambotkar
It happens to have 11 resistors from Specialized Power Systems (part of Simscape Electrical)
The resistances can be randomized using
for K = 1 : 11
pn = sprintf('SERIES_PARALLEL_RESISTORS/R_%d', K);
set_param(pn, 'Resistance', sprintf('%.5g', 1000 + randn(1)));
end
Here, SERIES_PARALLEL_RESISTORS is the model name, and each of the resistors happened to be named R_ followed by a number. Resistance is the name of the parameter used in SPS for resistance (some of the other forms of resistor in Simulink use 'R' as the name for the resistance.)
It was saved with R2020a (you did not indicate which version you are using.)
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More Answers (1)

Fangjun Jiang
Fangjun Jiang on 27 May 2020
Edited: Fangjun Jiang on 28 May 2020
This "Variable Resistor" is not the right one to use. This "Variable Resistor" represents a physical variable resistor in the lab where you can move a handle or turn a knob to adjust the value of the resistor. The "PS" port of this block can be connect to a motor (for example) to move the handle or turn the knob thus change the resistor.
To implement what you want, you just need to set "R=10e3-10+20*rand(10,1)" in workspace and drop 10 regular resistor blocks in your model, set the parameter for the first resistor to be R(1), ... and the last one to be R(10).
  1 Comment
fima v
fima v on 28 May 2020
could you please show a print screen of "R=10e3-10+20*rand(10,1) in workspace"?
and drop 10 resistors.i am having trouble visualise it.
Thabks.

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