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Unformatted text preview: Problem 3 Consider a unity feedback system with open loop transfer function being G(s)= K (e- 0.8 s ) / (s+1). Draw the Nyquist plot. Find the value of K for achieving stability. Problem 4 Consider a lead compensator Gc1(s) in cascade with a lag compensator Gc2(s) such that the open loop is Gc1(s) Gc2(s). Draw the Nyquist plot of this system. Compare this plot with the Nyquist plot of a PD and that of a PI controller for very small ω and for very large ω when applicable. Problem 5 Consider a unity feedback control system with open loop TF: G(s)= k/ [ s( s 2 + s + 4) ] Determine the value of gain K such that the phase margin is 50 o . What is the gain margin for this K? show all your work....
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- Spring '10
- Nyquist plot