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Title: Identification of time delay model for integrating processes from closed-loop step test
Authors: Liu, Tao
Gao, Furong
Zhao, Chunhui
Keywords: Closed-loop step response test
Integrating process control
Model identification method
Time delay model
Issue Date: Aug-2009
Citation: Proceedings 7th Asian Control Conference (ASCC 2009), 27-29 August 2009, Hong Kong, China, p. 615-619
Abstract: Based on a closed-loop step response test, a model identification method is proposed for integrating processes with time delay in this paper. By introducing a damping factor to the closed-loop step response for realization of the Laplace transform, a frequency response estimation algorithm is developed in terms of the closed-loop control structure used for identification. Correspondingly, two model identification algorithms are derived analytically for obtaining the widely used low-order process models of first-order-plus-dead-time (FOPDT) and second-order-plus-dead-time (SOPDT), respectively. Illustrative examples from the recent literature are used to demonstrate the effectiveness and merits of the proposed identification algorithms.
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