Why Modern Controllers Can Go Unstable in Practice

This paper demonstrates the importance of analyzing proposed modern control system designs with classical frequency response techniques. When classical constraints such as open-loop crossover frequency are ignored, apparently robust modern control designs may go unstable for relatively innocuous plant perturbations. Modern control system designs of successively more complex plants are analyzed to reveal some problems that may occur in the design of real systems and to show how these problems can be solved so that modern control methods will be more useful to practical'control system designers.

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