ABSTRACT
It is well known that feedback may be used in a control design to obtain desirable properties that are not achievable with open-loop control. Among these are the ability to stabilize an unstable system and
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to reduce the effects of plant disturbances and modeling errors upon the system output. On the other hand, use of feedback control can also have undesirable consequences: feedback may destabilize a system, introducemeasurement noise, amplify the effects of disturbances andmodeling errors, and generate large control signals. A satisfactory control design will, if possible, achieve the potential benefits of feedback without incurring excessive costs.
