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Tuning a PID controller with the Ziegler-Nichols in Simulink

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dfgdg dfgdfg

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Dec 18, 2010, 1:03:04 PM12/18/10
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I want to set kp,ki,kd using Ziegler-Nichols method for this simulink model;
http://www.mathworks.com/matlabcentral/fileexchange/26275
I know I can set this parameters automatically from PID block.But I want to determine the values by calculating.
I looked a lot of documents about this method.And I knew Ziegler-Nichols method theoretically.
I increased kp, but I couldn't observe any oscillation at the output of system.How can I set these parameters Simulink using this method or Could you propose any other models or example to apply this method in simulink,clearly?
Also I tried another method but I couldn't determine L,T from its step response.

dfgdg dfgdfg

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Dec 19, 2010, 3:18:04 AM12/19/10
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Is there anyone to answer my question?I just want to ask this question;How can I implement Ziegler-Nichols Method in Simulink?Could you propose any example? but I couldn't determine L,T from its step response.

Ali

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Dec 19, 2010, 2:00:23 PM12/19/10
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Try this example :

6
G(s) = ------------------------------------
(2s+1)(4s+1)(6s+1)

step---------> + ------------> PID --------> G(s) --------------->Scope
|- |
| |
|__________________________|

1) Set the controller to a P-only controller (by setting Ki = 0 and Kd = 0).
2) Start to give values to Kp until the closed loop system is at the verge of
instability (sustained oscillations are obtained). use Kp = 1.71
3) Determine from the figure the ultimate period (Tu)
4) With the ultimate gain and period determined at steps 2 and 3 compute the parameters of a PID controller using the ZN tuning rules.

use a simulation time > 30

hope it would be Helpfull!!
ALi

"dfgdg dfgdfg" <sak...@gmail.com> wrote in message <iekf3s$anc$1...@fred.mathworks.com>...

Teofilus

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Apr 14, 2012, 2:00:37 AM4/14/12
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"elysion87" wrote in message <ieit0o$34o$1...@fred.mathworks.com>...

Teofilus

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Apr 14, 2012, 2:06:17 AM4/14/12
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please somebody help me. this is for my research about ziegler-nichol tuning optimization
> how to get a constant oscillation without trial PID controller (Kp,Ki,Kd) manually.

please sent the answer to my email (teofilu...@yahoo.com). thx a lot
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