Glossary of Control Engineering Terms - Q
Quantitative Feedback Theory (QFT): A robust control design technique where the plant uncertainty is represented by a set of templates in the complex plain (polar form) within each is enclosed all possible frequency responses for some specified frequency. The uncertainty templates are usually generated by a discrete grid of uncertainty parameters. From these templates performance constraints can be generated such that the controller can be designed in the complex plain or Nichols chart.
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