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Why sum block outputs value half of the input?

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shubham aadhe
shubham aadhe 2020-8-3
评论： shubham aadhe 2020-8-3
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?
  2 个评论
Roger J
Roger J 2020-8-3
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
Walter Roberson 2020-8-3
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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