Why I do not see the correct transfer function
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I am trying to build a feedback system and use the connect() function to build it. But some how I can not get the correct transfer function. Here is my code:
G1 = tf([1,[1,0]]); G2 = tf(1,[1 1 0]); G3 = tf(1,[1,1,0]);
G4 = tf(-2, 1); G5 = tf(-1,1); G6 = tf(1,[1,0]);
G7 = tf(-1,[1,1]);
Sys = append(G1,G2,G3,G4,G5,G6,G7);
Q = [1 6 5; 2 1 7; 3 2 0; 4 3 0; 5 4 0; 6 2 0; 7 3 0];
INPUTS = 1;
OUTPUTS = 4;
G = connect(Sys, Q, INPUTS, OUTPUTS);
tf(G)
Here is my error:
Warning: The closed-loop model may be improper because of singular algebraic loops.
ans =
0
Static gain.
Please help
采纳的回答
Hi Zeyuan,
Is G1 defined correctly? If it is, or if stil having trouble after correcting it, it would be easier to help with a block diagram drawing of the system to be modeled. You can upload a figure using the paperclip icon on the Insert menu if needed.
G1 = tf([1,[1,0]]), G2 = tf(1,[1 1 0]); G3 = tf(1,[1,1,0]);
G4 = tf(-2, 1); G5 = tf(-1,1); G6 = tf(1,[1,0]);
G7 = tf(-1,[1,1]);
Sys = append(G1,G2,G3,G4,G5,G6,G7);
Q = [1 6 5; 2 1 7; 3 2 0; 4 3 0; 5 4 0; 6 2 0; 7 3 0];
INPUTS = 1;
OUTPUTS = 4;
G = connect(Sys, Q, INPUTS, OUTPUTS);
更多回答（1 个）
Jasper Gerritsen
2026-7-16
You probably meant to write
G1 = tf(1,[1,0]);
But there is no way to tell unless you specify to us what you intended to do.
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