控制系统仿真（MATLAB版）（五）

这一节以simulink搭建控制系统框图

 G1 = tf([5 1],[1,0]);

>> G2 = tf([25],[1 2 25]);

>> G3 = series(G1,G2);

>> G4 = feedback(G3,0.1,-1);

>> step(G4)

>> A = [0 1 0 0;0 0 1 0;0 0 0 1;-20 -13 -22 -5];

>> B = [0;0;0;10];

>> C = [1 0 0 0];

>> D = 0;

>> G = ss(A,B,C,D)

>> step(G)

注意开环和单位负反馈闭环

>> s = tf('s');

>> G1 = 1/(s^2+2*s+5)*10/(s+4)+2/(2.5*s+1)

G1 =

 

        2 s^3 + 12 s^2 + 51 s + 50

  ---------------------------------------

  2.5 s^4 + 16 s^3 + 38.5 s^2 + 63 s + 20

 

Continuous-time transfer function.

>> G = feedback(G1,1,-1)

G =

 

         2 s^3 + 12 s^2 + 51 s + 50

  ----------------------------------------

  2.5 s^4 + 18 s^3 + 50.5 s^2 + 114 s + 70

 

Continuous-time transfer function.

>> step(G)

>> G1 = tf(2,[1 4 0]);

>> G = feedback(G1,1,-1);

>> step(G)