simulation discrete-time model
조회 수: 24 (최근 30일)
이전 댓글 표시
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?
댓글 수: 0
채택된 답변
Star Strider
2019년 11월 7일
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.)
댓글 수: 2
Star Strider
2019년 11월 10일
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.
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Time and Frequency Domain Analysis에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!