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6. Consider a state-space system x = Ax+ Bu, y = Cx for which the control input is defined as u- -Kx + r, with r(t) a reference input. This results in a closed-loop system x (A-BK)x(t)+ Br(t) = with matrices 2 -2 K=[k1 K2 For this type of controller, ki, k2 ER do not need to be restricted to positive numbers - any real number is fine (a) What is the characteristic equation of the closed-loop system, in terms of k1, k2? (b) Under what conditions on kı,k2 is the closed-loop system asymptotically stable? Hint: The Hurwitz condition may be useful Now consider certain performance criteria that the closed-loop system should meet. Ideally, the closed-loop system should have a) an overshoot of less than 5% and b) settling time T, that is less than 4 seconds (c) Sketch the location of all possible pole locations that will meet the desired performance criteria (d) Select a value for each of ki and k2 such that the performance criteria is met. BONUS: Plot the step response of the output of the closed-loop system in Matlab to demonstrate that the performance criteria and stability criteria has been met for your chosen value of K.

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