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.

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12/18/2010 6:03:04 PM

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.

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12/19/2010 8:18:04 AM

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

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12/19/2010 7:00:23 PM

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I'm looking for two things. Help with either one would be most appreciated. 1) I have a MATLAB GUI that runs a series of scripts. It makes use of the fixed point toolbox (fi objects and quantizer objects) and those things make it VERY slow. I have rewritten the quantizer and made my own quantizer m function. But, it doesn't warn me about overflows or underflows (which I suppose I could code up). Just the same, it'd be nice to go from MATLAB scripts and function to machine code if that's possible. 2) We use MKS Integrity Client 2006 for software source control. ...

Hi all. I need to tune a PID controller with time constants (period of the scillation) on the order of hours. Any suggestion for procedures or algorithms? Literature? Rune Rune Allnor wrote: > Hi all. > > I need to tune a PID controller with time constants > (period of the scillation) on the order of hours. Do you have a model of the controlled plant or the PID has to be tuned empirically? > Any suggestion for procedures or algorithms? > Literature? PID is a basic thing, you will get zillion of references on google. * The first that comes to mind are Ziegler and N...

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