Unformatted text preview: ω and K at the jaxis crossing. (b)(10). When K , the closedloop system has a pole at 160 = 10 − = s . Calculate the location of the other two closedloop poles. (c)(15). When , sketch the straightline Bode plot (magnitude and phase). Using this plot, find the approximate gain margin in dB? What is the gain margin as an absolute number? Using this value of gain margin, what is the largest value of K just before instability occurs? 80 = K (d)(15). Find the phase margin when (You can use MATLAB here) ( i ) K =20. What is the damping ratio of the complex roots? ( ii ) K =40. What is the damping ratio in this case? ( iii ) If the phase margin decreases, what happens to percent overshoot?...
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 Spring '07
 WOZNY
 Gain margin, j axis crossing

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