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Received August 2, 2017
Accepted September 14, 2017
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A Simple Method to Make the Quadruple Tank System Near Linear
Jietae Lee†
Inhyun Kyoung
Jea Pil Heo
YoungSu Park
Yugyeong Lim
Dong Hyun Kim
Yongjeh Lee1
Dae Ryook Yang1
Department of Chemical Engineering, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu, 41566, Korea 1Department of Chemical and Biological Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul, 02841, Korea
jtlee@knu.ac.kr
Korean Chemical Engineering Research, December 2017, 55(6), 767-770(4), 10.9713/kcer.2017.55.6.767 Epub 5 December 2017
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Abstract
Quadruple tank liquid level systems are popular in testing multivariable control systems for multivariable processes with positive or negative zeros. The liquid level system is nonlinear and it will help to illustrate the robustness of control systems. However, due to nonlinearity, it can be cumbersome to obtain process parameters for testing linear control systems. Perturbation sizes are limited for valid linearized process models, requiring level sensors with high precision. A simple method where the outlet orifice is replaced to a long tube is proposed here. The effluent flow rate becomes proportional to the liquid level due to the friction loss of long tube and the liquid level system shows near linear dynamics. It is applied to the quadruple tank system for easier experiments.
Keywords
References
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Ma, M., Chen, H., Findeisen, R. and Allgower, F., Int. J. Innovative Computing, Information and Control, 8(10B), 7083(2012).
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