Abstract:

Multivariable process object has a coupling characteristic frequently.There usually are some loops with inoperable variable,when decoupling those processes.This will make the identification of objects more difficult.A close-loop identification algorithm based on biased relay feedback is proposed in this paper.The identification of objects is realized by biased relay feedback.This method can find a main frequency band of the objects after analyzing and discussing the input and output signals.Thereby it will get an accurate model.Simulation examples show accuracy and applicability of the identification method for a wide range of processes.

Key words: modeling identification;closed-loop;relay feedback;frequency response