Algebraic loop error - Simulink

2023 5 17
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更新时间：2023 5 20
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Paul
Paul 2023-5-17

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Hi John,
The model equations as implemented are:
(1) actual_height = new_height
(2) new_height = displacement + actual_height
Or
(3) actual_height = dispslacement + actual_height
which is the algebraic loop.
Is that what the equations should be?

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John
John 2023-5-17
I see the error now. I think I need to add a time delay in the first equation. The ‘new height’ should be actual height but only for the next time step.
Do you think that adding a ‘delay one step’ block, in between the plant ‘new height’ output and ‘actual height’ input, would achieve this?
Paul
Paul 2023-5-17
Adding a delay somewhere between 'actual height' and 'new height' will remove the algebraic loop. But it's probabably an indication that something isn't being modeled correctly in the first place.

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John
John
2023-5-17

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John
John
2023-5-20

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