A survey of inherent design limitations

Abstract
The theory of inherent design limitations provides the basic scientific background for the field of linear feedback control, and all control engineers need to know the basic results from this area. Knowledge of inherent limitations is useful in designing a control law that achieves a reasonable tradeoff between conflicting system goals. More significantly, such knowledge is useful much earlier in the engineering design cycle, in order to configure the plant and specify sensors and actuators so that the resulting feedback control problem is tractable. Our purpose in the paper is to provide an overview of available results on design limitations, showing how they may be used to assess the potential difficulty of a feedback control design. We discuss results applicable to single input single output feedback systems in detail, and describe some extensions to multivariable feedback systems.

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