Nyquist Plot

A plot of real versus imaginary spectral components that is often used in servo analysis. Should not be confused with a polar plot of amplitude and phase.

For a single degree of freedom system, the Nyquist plot is a circle.

In the Nyquist plot, a resonance shows up as a circle, but there is no indication what its frequency is -- the Nyquist plot is like sighting down the frequency axis at the real and imaginary parts of the function.

See also: Circle Fitting.

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Subjects: Noise & Vibration