How to design a PID for the system

   6629e-015 s^3 + 17.4949 s^2 + 9.2371e-014 s - 883.0695
   --------------------------------------------------------
          s^4 + 0.58328 s^3 - 83.9278 s^2 - 29.4415 s
how to design the PID for the above system plzz help me

[Andrew Newell]

What do you mean by PID?

[Paulo Silva]

http://www.engin.umich.edu/class/ctms/pid/pid.htm

[Paulo Silva]

You have several ways to do it in matlab and simulink, most of them can do all the calculations for you, the best one is the pidtool but I think that it's only present in matlab 2010

Answer 1

[Rong]

For this particular plant with one unstable pole, an integrator and a non-minimum phase zero, no PID can stabilze it. Try a high-order controller and design it with "sisotool".

"sisotool" is an interactive control design environment that provides a suite of GUI based tools such as Bode plot and Nichols chart as well as automated tuning abilities for PID, IMC, LQG controllers.