화학공학소재연구정보센터
Journal of Process Control, Vol.20, No.1, 228-234, 2010
Relay feedback methods combining sub-relays to reduce harmonics
The relay feedback method is considered to be one of the easiest identification methods available for obtaining the ultimate information of the process It has been widely used in industry to automatically tune the PID controller Many applications of the method have been developed. In this research. a new framework has been proposed to reduce the harmonics of the relay feedback signal It linearly combined several sub-relay signals, which had different frequencies and gains and resulted in a significant reduction of harmonic terms Improved versions of several previous relay feedback methods have been successfully developed oil the basis of the proposed framework (C) 2009 Elsevier Ltd All rights reserved