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Unformatted text preview: of the open loop system response that corresponds to the amplitude and phase for the closed loop response. In particular, these expressions result in a very useful figure called the Nichols Chart. 3 ExampleRecall once again the example that Prof, Willcox used to illustrate the design of a phaselead compensator. The uncompensated and compensated open loop expressions we used in the earlier comparison werePlotting these two on the Nichols chart yields4 And as we determined earlier the phase margin of the uncompensated system is ?? degrees and the compensated system has ?? degrees of phase margin, as can be readily determined from the Nichols chart. Furthermore, it is clear that the uncompensated system has a resonant peak of ?? db, while the compensated system peak is only ?? db...
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 Fall '03
 willcox
 Topology, Aeronautics, Openloop controller

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