Discrepancy between MATLAB and Simulink closed loop response?

1 次查看（过去 30 天）
Ryan Rizzo
Ryan Rizzo 2019-1-7
评论： Ryan Rizzo 2019-1-7
I have a closed loop system which I am testing in MALTAB and Simulink, expecting the same output.
**MATLAB**
num_plant = [0.0001 10];
den_plant = [0.005 5 0.6616 61.01 2.11 20];
G1 = tf(num_plant, den_plant)
num_controller = [46615 6526 5.722e05 2.389e04 2.001e05]
den_controller = [1 404 41605 162000 200000]
C2 = tf(num_controller, den_controller)
G2=G1*C2; %G1 is same 5th order TF as Simulink
new2 = feedback(G2, 1);
step(new2)
Note:
G1 =
0.0001 s + 10
--------------------------------------------------------
0.005 s^5 + 5 s^4 + 0.6616 s^3 + 61.01 s^2 + 2.11 s + 20
C2 =
46615 s^4 + 6526 s^3 + 572200 s^2 + 23890 s + 200100
----------------------------------------------------
s^4 + 404 s^3 + 41605 s^2 + 162000 s + 200000
2.png
**SIMULINK**
1.png
----------
According to the official documentation, feedback should be doing what I am presenting with blocks in Simulink. Surely I am missing something. I checked the code and everything should be the same in both cases. What is the reason for this discrepancy?
  2 个评论
Aquatris
Aquatris 2019-1-7
What version of Matlab are you using?
I used the script (coppied your code without change other than adding grid on) in Matlab 2013a and the result looks identical to your simulink results.
untitled.jpg
Ryan Rizzo
Ryan Rizzo 2019-1-7
Thanks for trying this out! I am using MATLAB R2018a. I cannot understand why our results differ so much! Any suggestions on what I should do? Could it be that I'm using a different solver or something of the sort?

请先登录，再进行评论。

请先登录，再回答此问题。

回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Simulink 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by