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since this is just trial model it would be possible to do it. but since the real model cannot become marginal stable, is the method unuseable.

but it's not possible to make one using a PI which have these values.

I can see that it changes, but how can i prevent it? i mean shouldn't they have some conditions aswell??

but how come do they affect the system.. mean if a zero is dominant, would it then act as an dominant pole??.. But still the zero does not contain a imaginary part, which still make no sense why it should oscillate, and create overshoot.

how would zero be able to affect a system... as far I've understood is it only the poles which affects the system.

I just don't understand how come i canont determine my PID values, from where i want my poles placed.. I've solved ch. eq. for all possible controllers and PD seems to be the only one capable of given me poles at those two locations.

Yes.. but even for an overdamped system it doesn't resemble the charateristica of an overdamped system... In[959]:= Solve[10 x^2 + 120 x + 350 == 0, x] Out[959]= {{x -> -7}, {x -> -5}} There is no complex component.

I tried to make a general problem, but seems to have forgotten where it began at. I posted my problem on another forum. http://snag.gy/OqhxH.jpg I hope this helps. My repsponse criterias is that I want an overshoot to be 0% and settling time be under 1 sec. Using Matlab tuning application...

How should i using a PID controlle be able to adjust the Zero location, while i am adjusting the location of the pole.

but what criteria should i apply for determining the zeroes, and how does it affect the system. I mean it is still a LHP zero? so bad can't it be

But how come does zeroes apply overshoot? I thought it was only poles which affected the system

but ... http://snag.gy/0eODb.jpg how come??

Homework Statement Design a controller for the system G(S) such, that the step response to close loop transfer function has an overshoot of 0% and a settling time of less than 1 sec. Homework Equations G(s) = \frac{1}{10s^2 + 5s + 10} Controller has to be a PID controller. The Attempt...

I have this transfer function which i don't know why it is overshooting due to an step input. http://snag.gy/Vh1SM.jpg Could someone explain why it does that. It's it a close loop transfer function, where I've designed a controller for it, but for some reason, eventhoug all my poles...

I have this assignment (First problem - exercise 2 - dias 7) http://site.iugaza.edu.ps/bhamed/files/2010/02/L4-Root-Locus.ppt Which i am having some problems solving. I am stuck at B) So far i tried to solve the problem, by calculating the distance from origin to the breakaway point, by...