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Root locus analysis

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In control theory, a root locus is the locus of the poles and zeros of a system's S-function as the system gain is varied from 1 to infinity. The root locus is one of the most useful tools for analyzing single input single output linear dynamic systems. A system is stable if all of its poles are in the left-hand side of the s-plane.

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A good lecture about Root Locus from MIT. It describes the root-locus, its properties, and a step-by-step procedure for constructing a root-locus. Case studies are included which illustrate how to use the root-locus for designing a control system. The URL is http://www-me.mit.edu/Lectures/RLocus/.

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