Measurement of the dynamics of an object in an automatic control system

Abstract

Przedstawiony tekst opisuje wybrane sposoby pomiaru dynamiki obiektu. Przedstawiono klasyczne procedury wyznaczania parametrów uproszczonego modelu obiektu Küpfmüllera i Strejca oraz sposoby doboru optymalnych nastaw regulatora typu PID. Opisano wykorzystanie metody momentów do wyznaczania parametrów dla modelu Strejca. Przeprowadzono badania symulacyjne proponowanych metod. Badania te ukazują, jak w sposób praktyczny zastosować proponowane modele opisu dynamiki obiektu.The paper describes the ways of creation of the dynamics model of objects used in automatic control systems. In a closed control system, a continuous controller of the PID type is applied. To obtain a stable automatic control system, the controller settings should be selected. These parameters depend on the object dynamics, the kind of disturbances occurring in the system and the quality criteria accepted. There was undertaken the problem of creation of simplified object dynamics descriptions used in investigations for closed automatic control systems. Analytical, graphical and simulation methods were proposed for determination of parameters in simplified systems. The investigations were performed in Matlab Simulink simulation programs. The selection of the dynamic parameters of objects was made for the Küpfmüller model and the Strejc models (of the second, third and fourth order). The use of simulation methods will enable showing in a practical way, how to realize the object dynamics measurements. The investigations conducted confirmed the possibility of using the method proposed and, in particular, the method of the moments of the step response of the object for determination of simplified control object models. The simulation results obtained show how the solutions proposed may be applied in a practical way