What to do if simulink detects nonexistant algebraic loops

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Balazs Fischer 2021-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/761541-what-to-do-if-simulink-detects-nonexistant-algebraic-loops

评论： Fangjun Jiang 2021-3-3

What can you do, if simulink detects an algebraic loop that simply does not exist? I tried every combination of atomic subsystems and minimize algebraic loop occurences that I could think of. I have a subsystem that has as outputs the outputs of 2 integrators. I have one input. If I feed the input directly into the integrators I don't get an algebraic loop. If I multiply the input with other values that are calculated in the subsystem then I get an algebraic loop. Normally the factors would depend on other inputs. But I have disabled that and replaced all other inputs by constants. Still if I multiply I get an algabraic loop, if I don't all is well for simulink.

The detection is simply wrong. I can simulate with fixed stepsize. But if I simulate with variable stepsize the solver crashes due to minimum stepsize reached.