simulation discrete-time model
27 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
massimiliano frasca
el 7 de Nov. de 2019
Comentada: Star Strider
el 10 de Nov. de 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.
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 comentarios
Respuesta aceptada
Star Strider
el 7 de Nov. de 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 comentarios
Star Strider
el 10 de Nov. de 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.
Más respuestas (0)
Ver también
Categorías
Más información sobre Time and Frequency Domain Analysis en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!