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• W3040559893 abstract "Accurate modeling of liquid flow systems is necessary for the effective operation of the plant under different conditions. The plant dynamics may change with time, and due to this, the operation may not be satisfactory. In this article, relay autotuning of a liquid flow-line is proposed. Well-known describing function approximation is utilized for the estimation of gain of relay used in a feedback loop to excite the plant to be identified. The expressions are derived for the identification of a class of overdamped second-order plus dead-time and first-order plus dead-time plant dynamics. The identification method tested on different standard systems shows that the proposed method has good identification accuracy. Therefore, the proposed identification method is applied to a liquid flow line pressure control system. The experimental results show that an accurate dynamic model is extracted using the proposed method with a minimal set of data from an obtained limit cycle oscillation. The measured quantities of the limit cycle are utilized in the derived explicit expressions for the identification of unknown variables of the dynamic plant model. A distributed process control system is utilized here as a standard industrial platform to design virtual relay and conduct the proposed autotuning. The efficiency of the modeling method is demonstrated through the comparison of Nyquist and relay response plots with the transfer functions obtained from the MATLAB system identification toolbox." @default.
• W3040559893 created "2020-07-10" @default.
• W3040559893 creator A5023316028 @default.
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• W3040559893 date "2020-07-06" @default.
• W3040559893 modified "2023-09-23" @default.
• W3040559893 title "Transfer function identification of a liquid flow-line pressure control system from simple relay auto-tuning" @default.
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• W3040559893 doi "https://doi.org/10.1177/0142331220934949" @default.
• W3040559893 hasPublicationYear "2020" @default.
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