algebraic loop

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Danilo NASCIMENTO
Danilo NASCIMENTO 2011-12-20
评论： Sean 2014-12-3
I'm trying to make an application using Simulink but I'm encountering some mistakes. The output of my subsytem is a derivative of a variable, dw, then I use an integrator to integrate this variable and get w, then I feed back this system with this same variable and I get this message below.
"Cannot solve algebraic loop involving 'novo_modelo/Fuel Cell Stack/Anode Flow Model/Anode' because it consists of blocks that cannot be assigned algebraic variables, i.e., blocks with discrete-valued outputs, blocks with non-double or complex outputs, Stateflow blocks, or nonvirtual subsystems"
Why of this? Am I doing something wrong?

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回答（2 个）

Fangjun Jiang
Fangjun Jiang 2011-12-20
It sounds like that the algebraic loop should not occur since you have an integrator, unless what you described of your model is not accurate.
See Algebraic Loops
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Danilo NASCIMENTO
Danilo NASCIMENTO 2011-12-20
Where do I see whether it is atomic or not? And the integrator is within the subsystem.
Danilo NASCIMENTO
Danilo NASCIMENTO 2011-12-20
The problem is only with the integrator? There are other subsystems that are having the same mistake and they don't have integrator.

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Guy Rouleau
Guy Rouleau 2011-12-21
I recommend taking the time to go through the algebraic loop section of the doc:
http://www.mathworks.com/help/toolbox/simulink/ug/f7-8243.html#f7-19688
This section contains multiple examples explaining what is an algebraic loop, an atomic subsystem and why it can lead to "artificial" algebraic loop.
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Sean
Sean 2014-12-3
The link above does not work (as of 12/3/14)

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