By Yu, Cheng-Ching
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Extra info for Autotuning of PID Controllers [electronic resource]: A Relay Feedback Approach
Wang et al.  discuss various aspects of the relay feedback. The distinct advantages of the relay feedback are: 1. It identifies process information around the important frequency, the ultimate frequency (the frequency where the phase angle is ). 2. It is a closed-loop test; therefore, the process will not drift away from the nominal operating point. 3. For processes with a long time constant, it is a more time-efficient method than conventional step or pulse testing. The experimental time is roughly equal to two to four times the ultimate period.
Res. 1994;33:1708. 9. Wood RK, Berry MW. Terminal composition control of a binary distillation column. Chem. Eng. Sci. 1973;28:1707. 10. Chang RC, Shen SH, Yu CC. Derivation of transfer function from relay feedback systems. Ind. Eng. Chem. Res. 1992;31:855. 11. Li W, Eskinat E, Luyben WL. An improved autotune identification method. Ind. Eng. Chem. Res. 1991;30:1530. 12. Wang QG, Hang CC, Zou B. Low-order modeling from relay feedback. Ind. Eng. Chem. Res. 1997;36:375. 13. Majhi S, Atherton DP. Auto-tuning and controller design for processes with small time delays.
1987;26:2490. 3. Seborg DE, Edgar TF, Mellichamp DA. Process dynamics and control. 2nd ed. New York: Wiley; 2004. 4. Luyben WL, Luyben ML. Essentials of process control. New York: McGraw-Hill; 1997. 5. Wang QG, Lee TH, Lin C. Relay feedback. London: Springer-Verlag; 2003. 6. Ogata K. Modern control engineering. Prentice-Hall: Englewood Cliffs; 1970. 7. Tyreus BD, Luyben WL. Tuning PI controllers for integrator/dead time processes. Ind. Eng. Chem. Res. 1992;31:2625. 8. Friman M, Waller KV. Autotuning of multiloop control systems.