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Topic: Algebraic loop in Simulink model
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Joerg Jungblut

Posts: 2
Registered: 12/7/04
Algebraic loop in Simulink model
Posted: Oct 15, 1996 3:39 AM
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Hello!

I created a MATLAB/SIMULINK model of the following type (and
everything works well):

+---+ +---+ +---+ +---+
| |-->| |-->| |-->| |
| A | | B | | C | | D |
| |-->| |-->| |-->| |
+---+ +---+ +---+ +---+
^ ^ | |
| | | |
| +-----+ |
+---------+

Since there may be more than two links between the blocks I decided to
simplify the model. In order to reduce the number of necessary links
between the blocks I modified the blocks the following way using MUX-
and DEMUX-blocks:

B' +-------------------------------+
| +-----+ +---+ +-----+ |
| | |-->| |-->| | |
|-->|Demux| | B | | Mux |-->|
| | |-->| |-->| | |
| +-----+ +---+ +-----+ |
+-------------------------------+

Then the model looks like this

+---+ +---+ +---+ +---+
| | | | | | | |
| A'|-->| B'|-->| C'|-->| D'|
| | | | | | | |
+---+ +---+ +---+ +---+
^ |
| |
+-------+

If this model is used MATLAB/SIMULINK signals an algebraic loop.
I would be grateful for any suggestions why this happens.


Thanks in advance,
Joerg

-------------------------------------------
Joerg Jungblut
Institute for Computer Science
Technical University of Clausthal
Germany

e-mail: jungblut@informatik.tu-clausthal.de
-------------------------------------------





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