A simple method to make the quadruple tank system near linear

Jietae Lee, Inhyun Kyoung, Jea Pil Heo, Young Su Park, Yugyeong Lim, Dong Hyun Kim, Yongjeh Lee, Dae Ryook Yang

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)767-770
Number of pages4
JournalKorean Chemical Engineering Research
Issue number6
Publication statusPublished - 2017 Dec


  • Hagen-Poiseuille equation
  • Linear experimental system
  • Liquid level system
  • Quadruple tank system

ASJC Scopus subject areas

  • Chemical Engineering(all)


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