frequencyresponse4

frequencyresponse4 - Frequency Response QUESTION 4 For the...

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Frequency Response Q UESTION 4 For the closed–loop system shown in Figure 4.1 with ( 29 ( 29 2 29 1 6.6 121 s s G s s s - = + + , complete the following: a. Sketch the Bode magnitude and phase plots by hand. Sketch the plots for each term and then sketch the total plots. Graph the Bode magnitude and phase plots using Matlab. b. Compute the gain and phase margins and the frequencies at which these occur. c. Using the Bode plots sketched in part (a), estimate the gain and phase margins and the frequencies at which these occur. G(s) K U(s) R(s) + - Y(s) E(s) Figure 4.1 29 term The magnitude is M = 20log 10 (29) = 29.25 dB for all ω . The phase is φ = 0° for all ω . s term The magnitude is M = 20log 10 ( ω ). The magnitude is M = 0 dB for ω = 0 and 20 dB/dec for all ω . The phase is = 90° for all ω . ( 29 1 s - term
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Frequency Response The magnitude is M = 20log 10 (1) = 0 dB for 0 < ω ≤ 1 rad/s. The magnitude is M = 0 + 20 dB/dec for ω > 1 rad/s. The phase is φ = 180° for ω < 0.1 rad/s. The phase is 180° > > 90° at a slope of –45°/dec for 0.1 ≤ ω ≤ 10 rad/s. The phase is = 90° for ω > 10 rad/s.
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This note was uploaded on 02/01/2012 for the course MECH ENG 279 taught by Professor Landers during the Spring '11 term at Missouri S&T.

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frequencyresponse4 - Frequency Response QUESTION 4 For the...

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