Why sum block outputs value half of the input?
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shubham aadhe
il 3 Ago 2020
Commentato: shubham aadhe
il 3 Ago 2020
Hello,
I am new to simulink and trying to understand why this system always gives the output half of the input.
If you calculate the the output
it should be 1 - 0 = 1
next step, 1 - 1 = 0
next step, 1 - 0 = 1
and so on.
How to understand the current behavior of the system?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/340624/image.jpeg)
2 Commenti
Roger J
il 3 Ago 2020
Looks like you have an algebraic loop. See the following
https://www.mathworks.com/matlabcentral/answers/95310-what-are-algebraic-loops-in-simulink-and-how-do-i-solve-them#answer_104662
To get the alternating 1 and zero, try adding a delay before the ”-” input on your adder.
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Walter Roberson
il 3 Ago 2020
There is no implied delay between blocks, and you have configured a continuous solver.
Your system is equivalent to asking
solve(1-x==x)
which has a solution of 1/2
You need to break the algebraic loop, by using one of the methods of introducing a delay between the output of the difference and the time the difference gets fed back as input. Look in blogs.mathworks.com for the topic of breaking algebraic loops
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