Since frequent and large load changes are often encountered in industrial processes, any identification procedure should be able to, at least, detect load changes, more positively, to find quality process model under load disturbance. In this chapter, the relay feedback system is enhanced by taking the effect of the load into account. In other words, instead of analyzing or validating the plant data afterward, the load effect is compensated for during the plant tests.
KeywordsOutput Response Load Effect Feed Flow Rate Load Change Nonlinear Element
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- Marlin, T. E. Process Control: Designing Processes and Control Systems for Dynamic Performance, McGraw-Hill: New York 1995.Google Scholar
- Oldenburger, R.; Boyer, R. C. “Effects of Extra Sinusoidal Input to Nonlinear Systems,” Trans. ASME, 1962, 84D, 559.Google Scholar
- Seborg, D. E.; Edgar, T. F.; Mellichamp, D. A. Process Dynamics and Control, Wiley: New York, 1989.Google Scholar
- Shen, S. H.; Wu, J. S.; Yu, C. C. “Biased-Relay Feedback for System Identification,” AIChE J., 1996, 42, 1174.Google Scholar
- Smith, C. L., Digital Computer Process Control, Intex: Scranton, 1972.Google Scholar
- West, J. C.; Douce, J. L.; Livesley, R. K. “The Dual-Input Describing Function and Its Use in the Analysis of Non-linear Feedback Systems,” Proc. IEE, 1956, 103B, 463.Google Scholar