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In control theory, quantitative feedback theory (QFT), developed by Isaac Horowitz (Horowitz, 1963; Horowitz and Sidi, 1972), is a frequency domain technique utilising the Nichols chart (NC) in order to achieve a desired robust design over a specified region of plant uncertainty. Desired time-domain responses are translated into frequency domain tolerances, which lead to bounds (or constraints) on the loop transmission function. The design process is highly transparent, allowing a designer to see what trade-offs are necessary to achieve a desired performance level.

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  • In control theory, quantitative feedback theory (QFT), developed by Isaac Horowitz (Horowitz, 1963; Horowitz and Sidi, 1972), is a frequency domain technique utilising the Nichols chart (NC) in order to achieve a desired robust design over a specified region of plant uncertainty. Desired time-domain responses are translated into frequency domain tolerances, which lead to bounds (or constraints) on the loop transmission function. The design process is highly transparent, allowing a designer to see what trade-offs are necessary to achieve a desired performance level. (en)
  • La théorie quantitative de la rétroaction, appelée Quantitative Feedback Theory(QFT) en anglais,fut développé par Isaac Horowitz. C'est une technique fréquentielle utilisant le diagramme de Nichols pour réaliser une commande robuste. Les réponses temporelles désirées sont traduites en tolérances dans le domaine fréquentiel. Le processus de conception est fortement transparent, permettant à un concepteur de voir quel compromis est nécessaire pour réaliser un niveau de performance désiré. (fr)
  • 量化回授理論(quantitative feedback theory,簡稱QFT)是控制理论中的理論,是由所發展(Horowitz, 1963; Horowitz and Sidi, 1972)是利用尼柯尔斯图(NC)的頻域技術,在受控體有特定程度不確定性的情形下,達成理想的強健設計。設計時會將想要的時域響應轉換為頻域的容許偏差,最後會反映在迴路傳遞函數的限制條件上。此作法具有高透明性,可以讓設計者看到為了想要的性能,在哪些方面需要做取捨。 (zh)
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  • In control theory, quantitative feedback theory (QFT), developed by Isaac Horowitz (Horowitz, 1963; Horowitz and Sidi, 1972), is a frequency domain technique utilising the Nichols chart (NC) in order to achieve a desired robust design over a specified region of plant uncertainty. Desired time-domain responses are translated into frequency domain tolerances, which lead to bounds (or constraints) on the loop transmission function. The design process is highly transparent, allowing a designer to see what trade-offs are necessary to achieve a desired performance level. (en)
  • La théorie quantitative de la rétroaction, appelée Quantitative Feedback Theory(QFT) en anglais,fut développé par Isaac Horowitz. C'est une technique fréquentielle utilisant le diagramme de Nichols pour réaliser une commande robuste. Les réponses temporelles désirées sont traduites en tolérances dans le domaine fréquentiel. Le processus de conception est fortement transparent, permettant à un concepteur de voir quel compromis est nécessaire pour réaliser un niveau de performance désiré. (fr)
  • 量化回授理論(quantitative feedback theory,簡稱QFT)是控制理论中的理論,是由所發展(Horowitz, 1963; Horowitz and Sidi, 1972)是利用尼柯尔斯图(NC)的頻域技術,在受控體有特定程度不確定性的情形下,達成理想的強健設計。設計時會將想要的時域響應轉換為頻域的容許偏差,最後會反映在迴路傳遞函數的限制條件上。此作法具有高透明性,可以讓設計者看到為了想要的性能,在哪些方面需要做取捨。 (zh)
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  • Théorie quantitative de la rétroaction (fr)
  • Quantitative feedback theory (en)
  • 量化回授理論 (zh)
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