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Drawing a Polar Plot using Matlab

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A unity feedback system has a process: (see attachment)

Determine the range of K for which the system is stable by drawing a polar plot.

The radius = K/2 for K > 1 there is P = 1 and N = -1.

Z = N + P = -1 + 1 = 0 and the system is stable for K >1.

I believe the best way to show a polar plot is to use a Nyquist plot in Matlab.

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This solution of 198 words explains the unity feedback system process and includes Nyquist plots in Matlab that explains a polar plot.

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A unity feedback system has a process

Determine the range of K for which the system is stable by drawing a polar plot.

The Nyquist plots with several K have been plot by using BM_polar.m.

From analysis, .
The real part is and the imaginary ...

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