Derivative in simulink causes instability?!

6 次查看（过去 30 天）
Alireza Sadri
Alireza Sadri 2018-4-16
评论： Alireza Sadri 2018-4-17
Hi all,
I have attached diagram of a simple system in simulink and I used Linearizing tool t extract the transfer function and its poles as shown in the figure. Any suggestion why this system is unstable? (I used a transfer function tf([N 1/N],[1 N])) instead of the derivative and its stable now.
Best regards Alireza
  2 个评论
Alireza Sadri
Alireza Sadri 2018-4-17
Hi,
Sure, I have attached the block diagram in simulink, but these are all basic simulink elements and I am trying to show that what is happening to derivative block is far more than what is documented and I have no explanation for that, but I do have a solution as mentioned before.
Best regards Alireza

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Ravi Tripathi
Ravi Tripathi 2018-4-17
Please use a low pass filter after the derivative according to the signal frequency.
  1 个评论
Alireza Sadri
Alireza Sadri 2018-4-17
Well as I mentioned, if I use tf([N a],[1 N]) and set a to a small positive number, the problem is solved. But I was looking for the reason behind this. Mabe the designer of the derivative should allow people to set a.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Array and Matrix Mathematics 的更多信息

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by