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Definition of "robustness" |
(1) a control system quality of keeping its properties in the admissible range in spite of disturbances and other environmental perturbations as well as uncertainties in the system model. The most frequent requirements deal with robust stability and robust performance expressed, for example, in terms of guaranteed cost. Robust systems have the property of being insensitive to changes in the model parameters as well as external disturbances. Usually the system robustness is reached via robust controller design, although systems could be robust in some sense (for example, robustly stable) without use of any special design techniques. It is, for example, well known that for the majority of real-world plants, standard PID controller suitably tuned ensures sufficient robustness. Nevertheless, in many situations, robustness can be guaranteed only by sophisticated design techniques such as H infinity design, min-max control, practical stabilization, guaranteed cost control, and others. |
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