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RISS 인기검색어
- 검색키워드
- 저자 : ( Yongjeh Lee ) (검색결과 3 건)
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Lee, Jietae,Lee, Yongjeh,Yang, Dae Ryook,Edgar, Thomas F. American Chemical Society 2018 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.57 No.8
<P>Many methods are available to tune proportional integral (PI) controllers for first order plus time delay (FOPTD) models of overdamped processes. The two asymptotes for small and large ratios of time delays over time constants are easily calculated. These two asymptotes can be used to evaluate and provide guidelines for the performance and application ranges of PI controller tuning rules. By matching these two asymptotes, a simple analytic tuning rule is suggested. For some overdamped processes whose transfer functions have large zero terms, half-order plus time delay (HOPTD) models are found to yield better results than the FOPTD models. Applying the technique of matching two asymptotes, a simple analytic PI controller tuning rule has also been proposed for the HOPTD models. To apply these tuning rules to high order processes with known transfer functions, model reduction methods to obtain the FOPTD and HOPTD models are investigated. Simulation results for empirical and full models of processes show the performances of the proposed model reduction methods and tuning rules.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/iecred/2018/iecred.2018.57.issue-8/acs.iecr.7b03966/production/images/medium/ie-2017-039664_0009.gif'></P>
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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 Lee ),( Dae Ryook Yang ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.6
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 pre-cision. 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 lin-ear dynamics. It is applied to the quadruple tank system for easier experiments.
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Inhyun Kyoung,Jietae Lee,Yongjeh Lee,Dae Ryook Yang 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
Hysteresis on the liquid level system(HOLLY)-based water tank liquid level systems show popular in testing multivariable control systems for multivariable processes with positive or negative zeros. When showing the relationship between the quantity of state and the variables of state in the substance obtained by test bed, it can be seen to draw a loop phenomenon which the quantity of state is not consistent at the time of increasing and decreasing after the variable of state was increased or decreased cyclically in a predetermined range. This phenomenon is called hysteresis. In some exothermic reactors, ignition and extinction temperatures are different. The ignition temperature is greater than the extinction temperature. It shows hysteresis for increasing and decreasing the reactor temperatures. Similarly, hysteresis occurs in ferromagnetic materials and ferroelectric materials, as well as in the deformation of some materials such as rubber bands and shape-memory alloys in response to a varying force. Test bed to inspect like as nonlinear dynamics are complicated construct and operate. To solve this, a liquid level system advanced a great deal such hysteresis process by using siphon occurrence. Siphon has become aware of hysteresis in our liquid level system named the hysteresis on the liquid level system(HOLLY). This HOLLY is compact size and even simply assemble parts for the process control. Apart from anything else this is not produce wastes. Here a supplementary dynamic aspect with siphon applying a hysteresis process is proposed.
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