Illustration of how the position of the Nyquist diagam relative to the -1 point tends to be directly related to the closed-loop behaviour. Uses several examples to show that being close to -1 tends to result in poor behaviour and also indicates that some formal measure of distance from -1 could be useful.
Presents a typical examination questions for students to attempt. Covers basic analysis tools of Nyquist, Bode and root-loci and analysis of potential lead/lag compensators. Also gives a worked solution.
Presents analysis which explains the basis for the use of a 60 degree phase margin as a good target. Illustrates the limitations of this assumption through numerous examples.