Specifications

3 Operations on LTI Models
3-18
to specify the block-decoupled LTI model interconnection.
See
append for more information on this function.
Feedback and Other Interconnection Functions
The following LTI model interconnection functions are useful for specifying
closed- and open-loop model configurations:
•
feedback puts two LTI models with compatible dimensions in a feedback
configuration.
•
series connects two LTI models in series.
•
parallel connects two LTI models in parallel.
•
lft performs the Redheffer star product on two LTI models.
•
connect works with append to apply an arbitrary interconnection scheme to
a set of LTI models.
For example, if
sys1 has m inputs and p outputs, while sys2 has p inputs and
m outputs, then the negative feedback configuration of these two LTI models
sys1
sys2
Appended Models
u
1
u
2
y
1
y
2
sys10
0 sys2
Transfer Function
sys1
sys2
–
+
u
y