First of all, I am new to this Q/A site. If I am doing anything wrong, please forgive me. I am having some trouble solving this problem:
Given the system of Figure(1), design a PID controller so that the system can operate with a peak time that is third(3 times) that of the uncompensated system at 20% overshoot and with zero steady-state error for a step input.
Now I have to find PD compensated System using this matlab code:
clear all close all clc Gs=zpk([-8 -0.85],[-3 -6 -10],1) rlocus(Gs)
Am I missing something here?? What's wrong with my solution up to the point. I have solved it with for 2/3 times and 1/3 times. Both times I was successful but in case of 3 times not getting any result.