Diagnosis of Control Loops Oscillations Based on EMD and Closed-Loop Testing#br#

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KONG Jie, TIAN Xue-min, SHANG Lin-yuan

Control Engineering of China ›› 2019, Vol. 26 ›› Issue (5) : 879-891.

Control Engineering of China ›› 2019, Vol. 26 ›› Issue (5) : 879-891.

Diagnosis of Control Loops Oscillations Based on EMD and Closed-Loop Testing#br#

#br#

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Abstract

In this work, an algorithm combining Empirical Mode Decomposition (EMD) with closed-loop testing principle is presented for identification of multiple root causes for oscillations in closed-loop systems. EMD is used to decompose the controller output data and the system output data into a finite set of IMFs, and then the closed-loop testing principle can exactly isolate the source of oscillation corresponding oscillatory IMF by injecting extra testing signal. The improved approach is used for determination of multiple causes for oscillation in linear SISO systems. Finally, the simulation experiment on the continuous stirring and mixing process validates the effectiveness and reliability of the proposed method.

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KONG Jie, TIAN Xue-min, SHANG Lin-yuan. Diagnosis of Control Loops Oscillations Based on EMD and Closed-Loop Testing#br#
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[J]. Control Engineering of China, 2019, 26(5): 879-891

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