Nyquist Diagrams
Abstract
The principles of polar plots and Nyquist diagrams are introduced. The Nyquist stability criterion application to describing the stability of control systems is discussed.
Keywords
Nyquist diagrams; stability
12.1 Introduction
This chapter follows on from Chapter 11 and presents another method of describing the frequency response of systems and their stability. The method uses Nyquist diagrams; in these diagrams the gain and the phase of the open-loop transfer function are plotted as polar graphs for various values of frequency. The transfer function of a basic closed-loop ...
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