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Unformatted text preview: 37 NYQUIST PLOT 140 37 Nyquist Plot Consider the attached images; here are a few notes. In the plant impulse response, the initial condition before the impulse is zero. The frequency scale in the transfer function magnitude plots is 10 3 10 4 radians per second. In the plot of P ( s ) loci, the paths taken approach the origin from 90 , and do not come close to the critical point at 1+0 j , which is shown with an x . In the plot of P ( s ) C ( s ) loci, the unit circle and some thirtydegree lines are shown with dots. Also, the two paths in this plot connect off the page in the righthalf plane. Answer the following questions by circling the correct answer. 1. The overshoot evident in the openloop plant is about (a) 120% (b) there is no overshoot since this is not a step response (c) 70 % (d) 40% 2. The natural frequency in the openloop plant is about (a) one Hertz (b) one radian per second To compute this, you need a whole cycle. (c) 1.2 radians per second (d) six radians per second 3. Based on the plant behavior, P ( s ) probably has (a) no zeros and one pole (b) one zero and one pole (c) no zeros and two poles (d) one zero and two...
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 Spring '05
 GeorgeKocur

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