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소각 프린트의 증기발생 및 배기가스에 대한 파라메트릭 ARX 모델규명
황이철,Hwang, Lee-Cheol 제어로봇시스템학회 2002 제어·로봇·시스템학회 논문지 Vol.8 No.7
This paper studies the identification of a combustion model, which is used to design a linear controller of a steam generation quantity and harmful exhaust gases of a Refuse Incineration Plant(RIP). Even though the RIP has strong nonlinearities and complexities, it is identified as a MIMO parametric ARX model from experimental input-output data sets. Unknown model parameters are decided from experimental input-output data sets, using system identification algorithm based on Instrumental Variables(IV) method. It is shown that the identified model well approximates the input-output combustion characteristics.
황이철,전충환,이진걸,Hwang, l-Cheol,Jeon, Chung-Hwan,Lee, Jin-Kul 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.3
This paper identifies a discrete-time linear combustion model of Refuse Incineration Plant(RIP) which characterizes steam generation quantity, where the RIP is considered as a MIMO system with thirteen-inputs and one-output. The structure of RIP model is described as an ARX model which are analytically obtained from the combustion dynamics. Furthermore, using the Instrumental Variable(IV) identification algorithm, model structure and unknown parameters are identified from experimental input-output data sets, In result, it is shown that the identified ARX model well approximates the input-output combustion characteristics given by experimental data sets.
LMI 에 기초한 연속 냉간압연기의 H^{\infty} 서보 제어기 설계
김인수,황이철,이만형,Kim, In-Soo,Hwang, I-Cheol,Lee, Man-Hyung 제어로봇시스템학회 2000 제어·로봇·시스템학회 논문지 Vol.6 No.1
In this paper, we design a H^\infty servo controller for gauge control of tandem cold mill. To improve the performance of the AGC(Aotomatic Gauge Control) system based on the Taylor linearized model of tandem cold mill, the H^\infty servo controller is designed to satisfy robust stability, disturbance attenuation and robust tracking properties. The H^\infty servo controller problem is modified as an usual H^\infty control problem, and the solvability condition of the H^\infty servo problem depends on the solvability of the modified H^\infty control problem. Since this modified problem does not satisfied standard assumptions for the H^\infty control problem, it is solved by an LMI(Linear Matrix Inequality) technique. Consequently, the comparison between the H^\infty servo controller and the existing PID/FF(FeedForward) controller shows the usefulness of this study.
김성배,황이철,Kim, Seong-Bae,Hwang, Lee-Cheol 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.8
This paper studies on the design of a looper control system for hot strip mill finisher using ILQ(Inverse Linear Quadratic optimal control) control method. The loopers are placed between each rolling stands and looper control plays an important role in regulating strip tension. The strip tension is controlled by raising and lowering the looper and by changing the speed of main work rolls. Firstly, it is shown from a nonlinear dynamic simulation that the strip tension is more influenced by difference of rolling speed than that of the looper angle. Secondly, a servo controller of the looper is designed using ILQ control method of which the characteristics and algorithms are simply introduced. Finally, the performances of the ILQ servo controller are compared with those of the LQI servo controller from computer simulation. In result, it is shown that the proposed ILQ servo controller has the better performances and robustness far parameter perturbations and disturbances than those of LQI controller.
부분공간법을 이용한 연속 냉간압연기의 상태공간모델 규명
김인수,황이철,이만형,Kim, In-Su,Hwang, Lee-Cheol,Lee, Man-Hyeong 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.2
In this paper, we study on the identification of discrete-time state-space model for robust control of tandem cold mill, using a MOESP(MIMO output-error state-space model identification) algorithm based on subspace method. It is shown that the identified model is well adapted to input-output data sets, which are obtained from nonlinear mathematical equations of tandem cold mill. Furthermore, deterministic H$\infty$ norm bounds on uncertainties including modeling errors and disturbances are quantitatively identified in the frequency domain. Finally, the results give a basic idea to determine weighting functions included in formulating some robust control problems of tandem cold mill.
신지영,손영석,차득근,이철균,황이철,Shin, Jee-Young,Son, Young-Seok,Cha, Duk-Guen,Lee, Cheol-Gyun,Hwang, I-Cheol 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.8
The objective of this study is to investigate the aerodynamic characteristics of a vertical axis wind turbine blade as the basic study of a design of a vertical axis wind turbine. The lift and drag coefficients of the various shape of the vortical axis wind turbine blades are analyzed and compared using the CFD code Fluent. To validate the numerical analysis, the predicted results of the Fluent are compared with those of the Xfoil code and the experimental results. We conclude that the program Fluent can be used to predict the aerodynamics of the wind turbine blade. By comparing the predicted results of the aerodynamic characteristics of the different shape of the blades, an appropriate shape of the blade is suggested to design the vortical axis wind turbine blade.