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how can i solve part 2 ... should i convert the statespace to tf?

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Mohammad Adeeb
Mohammad Adeeb 2018-3-13
评论： Birdman 2018-3-13
close all;
clear all;
clc;
m1=1;
m2=3;
k1=10;
k2=2;
b=0.5;
A=[0 1 0 0;-(k1+k2)/m1 -b/m1 k2/m1 b/m1;0 0 0 1; k2/m2 b/m2 -k2/m2 -b/m2];
B=[0;0;0;1/m2];
C=[1 0 0 0;0 0 1 0];
D=[0;0];
sys_ss=ss(A,B,C,D);
step(sys_ss);
[num,den]=ss2tf(A,B,C,D);

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Birdman
Birdman 2018-3-13
Actually you do not need to do that since they will eventually give the same result but since the question wants you to do it, write the following code:
Gs(1)=tf(num(1,:),den);
Gs(2)=tf(num(2,:),den)
step(Gs)
and you will see that you get identical results.
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