1976•Unpublished venueRequires access

Nyquist Analysis and Stability

Ruth V. Buckley

Abstract

The analysis of control systems with feedback may also be carried out using a method based on frequency response. The essence of this method, often referred to as a Nyquist plot, is a graphical procedure for determining absolute and relative stability of closed-loop control systems. Information about stability is available directly from a polar plot of the sinusoidal open-loop transfer function G(jω)H(jω), once the feedback system has been reduced to standard form.

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Key concepts: Nyquist plot, Nyquist stability criterion, Control theory (sociology), Nyquist–Shannon sampling theorem, Stability (learning theory), Transfer function, Nyquist frequency, Plot (graphics)