ss2tf and tf2ss function
11 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Dear sir, I use ss2tf function in matlab. Its output values input to tf2ss function. But the result is not equal to the original input. (A1,B1,C1,D1) IS NOT EQUAL TO (A,B,C,D.)
What wrong is it?
clear;
A=[0 1 0;0 0 1;-9 -8 -7];
B=[7;8;9];
C=[2 3 4];
D=[0];
[num, den]=ss2tf(A,B,C,D,1);
[a1,b1,c1,d1]=tf2ss(num,den);
a1 =
-7.0000 -8.0000 -9.0000
1.0000 0 0
0 1.0000 0
b1 =
1
0
0
c1 =
74.0000 -199.0000 -235.0000
d1 =
0
0 Kommentare
Antworten (2)
Fangjun Jiang
am 14 Jun. 2011
The tf2ss() returns A,B,C,D matrices in controller (or controllable) canonical form. There is also observable canonical form. Bottom line, the A, B, C, D returned by tf2ss() may not match your original state space matrix. See state space controls
mohammad asasi
am 23 Nov. 2012
Hi dear david
keep in mind that representation of a system in frequency domain is unique
but we can convert it to state space form in many many ways...
so representation in state space form is not uniqe...
best regards
0 Kommentare
Siehe auch
Kategorien
Mehr zu Dynamic System Models finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!