Optimum Setting for Automatic Controllers

Journal of Dynamic Systems Measurement and Control (Impact Factor: 0.98). 06/1993; DOI: 10.1115/1.2899060


In this paper, the three principal control effects found in present controllers are examined and practical names and units of measurement are proposed for each effect. Corresponding units are proposed for a classification of industrial processes in terms of the two principal characteristics affecting their controllability. Formulas are given which enable the controller settings to be determined from the experimental or calculated values of the lag and unit reaction rate of the process to be controlled. These units form the basis of a quick method for adjusting a controller on the job. The effect of varying each controller setting is shown in a series of chart records. It is believed that the conceptions of control presented in this paper will be of assistance in the adjustment of existing controller applications and in the design of new installations.

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    • "Particularmente, la presión neumática de la válvula de control entre 3 y 15psi con un comportamiento no lineal en diferentes regiones de trabajo y una leve histéresis. Estó ultimo explica la diferencia de comportamiento del sistema en las distintas regiones de trabajo, como se observa en la Fig. 16Método de la CR (Ziegler yNichols, 1942 "
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    • "Here, a PI controller is used with the values K p and T n determined by the Ziegler-Nichols method, cf. Ziegler and Nichols (1942). "
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    • "Such a change of perspective obviously offers a great potential against undesired modeling errors, but also offers new theoretical challenges to the systems and control community. In this field, a lot of work has already been done, ranging from the Ziegler and Nichols method (Ziegler and Nichols (1942)) to Virtual Reference Feedback Tuning (VRFT inCampi et al. (2002);Formentin et al. (2012aFormentin et al. ( ,b, 2013);Formentin and Karimi (2014)) until the recent data-driven loop-shaping approach (see). However, only few contributions have focused on nonlinear systems. "
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