1. Given the following system: +\\ R $K_D(s)$ \rightarrow $G(s)$ \rightarrow Y $\frac{s+z}{s+p}$, $G(s) = \frac{1}{(s + 0.1)(s + 1)}$ a) Design a lead compensator so that the resulting system is stable and has a bandwidth frequency of $\omega_{BW} = 2$ rad/sec and good damping. b) Draw the bode plot (magnitude and phase) for the resulting system. (You will need to visualize your design for refinement).
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39. The forward-path transfer functions of unity-feedback control systems are given in the following equations. Plot the Bode diagram of G(jw)/K, and do the following: (1) Find the value of K so that the gain margin of the system is 20 dB. (2) Find the value of K so that the phase margin of the system is 45. (a) G(s) = K / [s(1 + 0.1s)(1+0.5s)] (b) G(s) = K(s+1) / [s(1 + 0.1s)(1+0.2s)(1+0.5s)] (c) G(s) = K / (s+3)^3 (d) G(s) = K / (s+3)^4
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Problem 3 Consider the feedback control loop shown below. Its root locus plot for proportional control C(s)=K is shown below. At K=17, the dominant closed loop roots shown at s1,2=-4±4j (marked current design) guarantee a damping ratio of ζ=0.707 for that mode. For this system: a) Design a phase lead compensator Clead(s) = K (s + z) ⁄ (s + p) for the system to decrease the 2% settling time to 4/8=4/(ζωn) while keeping the damping ratio at ζ=0.707 (marked new design point in the figure at -8±8j). Place the phase lead compensator zero at -8 and i. determine the phase lead compensator pole location and (9 points) ii. determine the phase lead compensator gain required. (8 points) b) Design a phase lag compensator to improve the static gain by a factor of 10. Use a phase lag compensator pole of -0.01. (8 points)
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