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1

Reduced gain pi/pid controllers for foptd/soptd processes under load disturbance

Bożek Andrzej, Trybus Leszek

Acta Mechanica et Automatica

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2024

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Vol. 18, no. 2

212--222

EN

In practical applications, an engineer is sometimes expected to execute the step test for tuning the controller without waiting much for the steady-state or a low level of disturbances. Hence, knowing that the initial settings may not be quite reliable, he/she detunes the controller by reducing its gain as a precaution against possible poor behaviour of the closed-loop system. It is up to their experience to choose by how much to detune. Therefore, the development of a practically oriented approach that would assist the engineer to choose the degree of gain reduction is the goal of this paper. The approach assumes that process parameters are determined by the least-squares approximation of the step response. Accuracy of the approximation is evaluated by a relative approximation error involving integrals of the error and the process response itself. The SIMC tuning rules are applied to choose the initial controller settings. The approach relies on detecting by simulation the worst case that may happen when the step response is triggered at any time. Detuning nomograms specify by how much to reduce the initial gain for PI-FOPTD and PID-SOPTD designs, given the relative approximation error. Two long-lasting lab experiments involving temperature control identify a plant, verify the load disturbance model through multiple step tests and demonstrate usage of the approach in the closed-loop system.

2

Optymalizacja nastaw regulatorów PID do sterowania suwnicą 3D

Dziendziel T., Gruk M., Piotrowski R.

Pomiary Automatyka Robotyka

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2014

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R. 18, nr 6

78--85

PL

Suwnica stanowi ciekawy, a zarazem skomplikowany obiekt sterowania, który znajduje zastosowanie w różnych gałęziach przemysłu. W artykule przedstawiono obiekt sterowania wraz z jego układami sterowania wykorzystującymi regulatory PID. Następnie dobrano parametry regulatorów stosując wybrane metody inżynierskie i optymalizacyjne. Przeprowadzono szczegółową analizę porównawczą zaproponowanych rozwiązań.

EN

A crane is an interesting and difficult object for control, which is used in various industries. The paper presents an object and its control system using PID controllers. Next, the chosen parameters of these controllers using different methods: engineering and optimization. A detailed comparative analysis of the proposed solutions was realized.

3

Improving efficiency of pH control by balance-based adaptive control application

Stebel K., Czeczot J., Metzger M.

Archives of Control Sciences

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2013

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Vol. 23, no. 1

19--40

EN

This paper deals with the efficient control of the pH process. Considering the PI + gain scheduling (PI+GS) controller as the benchmark and its control performance as the base, we investigate experimentally the overall improvement in the control performance obtained by the application of the Balance-Based Adaptive Controller (B-BAC), which requires only the measurement data of the flow rates and pH values. The improvement of the control efficiency is investigated not only in terms of the controlled variable performance but also in terms of the manipulated variable performance considered as the considerable control cost. The application of the B-BAController can ensure lower controlled pH variability at the price of the control effort similar to the PI+GS approach and thus it can improve the overall efficiency of pH control. The second important contribution is the experimental validation of the very simple and intuitive tuning procedure for the B-BAController.