Specifications

Time Delays
2-53
To compute a Padé approximation of H(s)using:
•A first-order approximation for the 1 second and 3 second delays
•A second-order approximation for the 7 second delay,
type
pade(H,[],[],[1 1;2 1])
where H is the TF representation of defined in the distillation column
example. This command produces a rational transfer function.
Transfer function from input "R" to output...
–12.8 s + 25.6
Xd: ---------------------
16.7 s^2 + 34.4 s + 2
6.6 s^2 – 5.657 s + 1.616
Xb: ---------------------------------------
10.9 s^3 + 10.34 s^2 + 3.527 s + 0.2449
Transfer function from input "S" to output...
18.9 s – 12.6
Xd: ----------------------
21 s^2 + 15 s + 0.6667
19.4 s – 12.93
Xb: --------------------------
14.4 s^2 + 10.6 s + 0.6667
Hs
()