using ss2tf command
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Hi. I eant to plot frequency respose for a system with below equation:
x1_dot=x2;
x2_dot=-(k/m)x1+f/m;
note: k,m,f are known.
for this work, i want to use ss2rf command:
[num, den] = ss2tf(A, B, C, D);
now, for these equations are A,B,C,D as below?
A=[0 1;-k/m 0]
B[0;f/m]
C=[x1;x2];D=0
thank you
回答（2 个）
Star Strider
2020-5-6
0 个投票
2 个评论
saman ahmadi
2020-5-9
Star Strider
2020-5-9
My pleasure!
If my Answer helped you solve your problem, please Accept it!
.
Paul
2020-5-10
0 个投票
- Are you sure f is known? It looks like f is the input to you system, in which case your B matirix should be B = [0;1/m]
- You didn't say what the output of your system is. Is it x1, x2, both, some linear combinations of both? Without specifying your output, we can't say what your C and D matrices should be. But your C matrix as written cetainly doesn't look correct, unless you already have variables x1 and x2 in your workspace that have column dimension = 2;
- Once you get your A, B, C, and D matrices proberly defined, you can plot the frequency response with: bode(ss(A,B,C,D)) as Star Strider indicated. doc bode for options that may be of interest to you.
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2020-5-6
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