By Yu, Cheng-Ching
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Additional resources for Autotuning of PID Controllers [electronic resource]: A Relay Feedback Approach
This concept offers an attractive alternative to improve the relay feedback autotuning, because qualitative information of model structure is available. Here, we intend to utilize the shape information from the relay feedback test to identify the correct model structure of the process and to find appropriate PID controller settings. The additional shape information is also useful to devise dead time compensation and high-order compensation, when necessary. Hieroglyphic writing can often be seen in ancient cultures.
Eng. Chem. Res. 1996;35:3480. 8. Rivera DE, Morari M, Skogestad S. Internal model control 4 PID controller design. Ind. Eng. Chem. Proc. Des. Dev. 1986;25:252. 9. Seborg DE, Edgar TF, Mellichamp DA. Process dynamics and control. 2nd ed. New York: John Wiley & Sons; 2004. Features of PID Control 21 10. O’Dwyer A. Handbook of PI and PID controller tuning rules. London: Imperial College Press; 2003. 11. Martin JJ. Cubic equation of state – Which?. Ind. Eng. Chem. Fundam. 1979;18:81. 12. Luyben WL, Luyben ML.
If necessary, the dead time D can be read off from the initial response, or the time to the peak amplitude, and the steady state gain can be obtained from steady state simulation. 2. 2) after the relay feedback experiment. 3. 10) are fitted to the data. 1 Simple Approach Once the model is selected, we can back-calculate the model parameters from two equations describing the ultimate gain and the ultimate frequency. 12) Notice that no a priori process knowledge is needed for this model. Moreover, computation of K p and D is quite straightforward.