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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.
연속 냉간 압연기의 견실제어를 위한 상태공간모델 규명에 관한 연구
황이철 東義大學校 産業技術開發硏究所 1999 産業技術硏究誌 Vol.13 No.-
This paper studies on the identification of discrete-time state-space model for robust control of cold tandem mill, using a MOESP(MIMO output-error stat-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 cold tandem mill. Furthermore, deterministic H??? 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 cold tandem mill.
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.
한켈 연산자를 이용한 입력 시간지연 시스템의 지연특성에 관한 연구
황이철 東義大學校 産業技術開發硏究所 1999 産業技術硏究誌 Vol.13 No.-
This paper studies on the characteristics of input delay systems, using Hankel operator theory. In first, the analytic computation of Hankel singular values and their corresponding Schmidt pairs are introduced, and then it is shown that all the Hankel singular values have a monotone increasing properties as the length of delay time increases. Furthermore, it is shown that only the ratio of the length of delay and time constant of a lumped parameter system is dependent on the Hankel singular values through a simple numerical example.
자동차의 슬립율 서보제어를 위한 차륜시스템 피드백 선형모델에 관한 연구
황이철 동의대학교 산업기술개발연구소 2006 産業技術硏究誌 Vol.20 No.-
This paper studies on the feedback linearization of an automotive wheel to control the slip ratio, where the obtained linear model is used in designing the servo linear controller of an ABS(Antilock Brake System). First, a nonlinear dynamic equation of the automotive wheel system including a hydraulic actuator is analytically derived. Second, a linear model of the given system is constructed from a state feedback linearization algorithm. Finally, the feedback linearization model error is evaluated by computer simulation.
황이철,김성배 동의대학교 산업기술개발연구소 2001 産業技術硏究誌 Vol.15 No.-
This paper describes the model identification and the discrete-time sliding mode control of electro-hydrauric servo systems which are composed of servo valves, double-rod cylinder and load mass. The controlled plant is identified as a 3th-order discrete-time ARMAX model obtained from the prediction error algorithm, where a nominal model and modeling errors are quantitatively constructed. The discrete sliding mode controller for 3th-order ARMAX model is designed in discrete-time domain, where all states are observed from Kalman filter. The discrete sliding mode controller has better tracking performance than that obtained from continuous-time sliding mode controller, in experiment.
황이철 東義大學校産業技術開發硏究所 2003 産業技術硏究誌 Vol.17 No.-
This paper studies on 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). As 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. In result, it is shown that the identified model well approximates the input-output combustion characteristics given by experimental data sets.
열간압연공정의 선단부 통판성 안정화 제어 알고리즘 설계
황이철,백운보,박철재 제어로봇시스템학회 2008 제어로봇시스템학회 국내학술대회 논문집 Vol.2008 No.10
This paper studies on the new control algorithm for the mass-flow stabilization in strip head part of a hot strip mill. A new strip tension model in the strip head part is derived using the current deviation of two neighboring stands. The current deviation means a difference between a measured current and a lock-on current, where the lock-on current is set up when a strip tension or a looper angle reaches each target value, respectively. On the basis of the tension calculation model, a mill velocity of a backward stand is controlled to stable a strip mass-flow by PI control algorithm. Therefore, the mass-flow control for strip head part is executed from a metal-in time into a forward stand till the looper works normally. It is known by the results of a computer simulation and an experiment that the proposed control algorithm is very effective in stabilizing the mass folw of the strip head part.