Root locus for analysis and design

Abstract

In Chapter 10, we learnt the benefits of knowing where the poles and the zeros lie in the s-plane. We emphasised the useful information on the system stability and performance which may be extracted from the knowledge of the position of the poles. We saw that for a stable closed-loop system all the closed-loop poles must strictly lie in the LHP. Since stability is the prime objective of a control system design, we always ensure that our controller stabilises the system by relocating the poles such that they all lie in the LHP.