simulation discrete-time model
24 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
massimiliano frasca
am 7 Nov. 2019
Kommentiert: Star Strider
am 10 Nov. 2019
I'm studying the linear model of a DC motor. In state-space form, the governing equations above can be expressed by choosing the rotational speed and electric current as the state variables.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/247228/image.jpeg)
So:
Ac = [-b/J k/J; -k/L -R/L];
Bc = [0; 1/L];
Cc = eye(2);
Dc = zeros(2,1);
I expressed all in discrete -time:
sys_TC = ss(Ac,Bc,Cc,Dc);
sys_TD = c2d(sys_TC,Ts);
[A,B,C,D] = ssdata(sys_TD);
Now I shuould simulate the model (TD). In this sense, I simulate the input signal with the function rand. How can I obtain the results of the output and collect them in a matrix?
0 Kommentare
Akzeptierte Antwort
Star Strider
am 7 Nov. 2019
To simulate your system with the appropriate input, use the lsim function. You will need to create a time vector as well as the input signal vector. (You have a single-input system, so this is straightforward. For multiple-input systems, the number of columns in the input signal must match the number of columns of the B matrix.)
2 Kommentare
Star Strider
am 10 Nov. 2019
As always, my pleasure!
No, the output should be a matrix of N rows and two columns.
This code:
[u,t] = gensig('square',1,10,Ts);
y = lsim(sys_TD, u, t);
returns a (10001x2) output matrix in ‘y’ when I run it, as it should. If you are not using the gensig function, be sure to create ‘u’ and ‘t’ as column vectors.
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Time and Frequency Domain Analysis finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!