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黃圭東 忠州大學校 1991 한국교통대학교 논문집 Vol.25 No.-
An efficient method for computing the smallest eigenvalues(natural frequencies) and the corresponding eigenvectors (mode shapes) of large structural systems is presented. The method is an application of both the Newton-Raphson method and the modified Newton-Raphson method for improving the accuracy of each approximate eigenpair, which is determined by the subspace iteration method. A numerical example is presented to show the efficiency of the method and to compare it with the subspace iteration method and the determinant search method.
황규동,김도석,임대성 한국기계기술학회 2009 한국기계기술학회지 Vol.11 No.1
This study describes a hydraulic fluid property compensator under the various operating conditions. Because hydraulic fluid systems have much more excellent features than other control systems, they are used in many fields. However, the characteristics of hydraulic fluid are changed due to various operating conditions. This phenomenon is called uncertainty. Especially, bulk modulus is considered as the most dominant parameter in this study. In order to overcome the uncertainty ∞ control technique will be used for this study. Designed controller using the ∞ control technique, is adopted for the hydraulic fluid multistage double acting oil pressure cylinder. Repetition operation test gives from 5 to 8 percent errors in moving position.
Milling Burr 생성에 있어서의 절삭조건의 영향
黃圭東,黃德哲 충주대 산업과학기술연구소 2001 産業科學論文集 Vol.9 No.-
This paper presents the numerical analysis and experimental verification to know the metal cutting burr formation mechanism in face milling operation. inite element method are applied to predict the 2-D burr formation process prediction. Face milling process are adjusted to analyze the characteristics of burr shapes according to various cutting conditions. The cutting parameters were investigated with cutting speed, feed rate, depth of cut. Through the experiments various burr types are classified according to its shape and properties.
황규동 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.1
It is frequently confronted with the problems which need to minimize or to maximize the arbitrary function values, satisfying certain limited conditions in engineering design as well as in economics and basic sciences. In order to solve these, first, it is necessary to know quantitatively how the design parameters to determine are related with the confronted problem, and then to make them to minimize and to express the limited condition to a numerical equation. Second, it is necessary to determine the optimized design parameters to satisfy the limited condition utilizing an optimization technique for the analysed problems. It is focused on the development of simple program which can effectively perform the optimization process by inputting minimum data using general personal computer in this study, regardless of that whether object function and the limited condition equation are linear or not.
황규동 忠州大學校 2005 한국교통대학교 논문집 Vol.40 No.2
This study describes a hydraulic fluid property compensator under the various perating conditions. Because hydraulic fluid systems have much more excellent features than other control systems, they are used in many fields. However, the characteristics of hydraulic fluid are changed due to various operating conditions. This phenomenon is called uncertainty. Especially, bulk modulus is considered as the most dominant parameter in this study Under the wide range of temperature and pressure, bulk modulus is changed. In order to overcome the uncertainty, H_(∞) technique will be used for this study. Spectral factorization, model matching problem and controller parametrization are also applied to achieve the desired robust control action. Designed controller using the H_(∞) technique, is adopted for the hydraulic fluid valve motor system.
黃圭東 忠州大學校 1998 한국교통대학교 논문집 Vol.33 No.1
This study treats the determination of eigenvalues and eigenvectors of large algebraic systems. The methods developed are applicable to finding the natural frequencies and modes of vibration of large structural systems. For distinct eigenvalues the method is an application of the modified Newton Raphson method that turns out to be more efficient than the standard competing schemes. A numerical example is presented to show the efficiency of the method and to compare it with the subspace iteration method and the determinant search method.
수정된 Feasible Direction Method에 의한 최적화 방안의 연구
黃圭東 충주대학교 1994 한국교통대학교 논문집 Vol.29 No.1
Application of the Numerical Optimization Techniques to engineering design problems is useful for obtaining reasonable design variables. in this paper, the numerical optimization program for a microcomputer was deve loped using modified feasible direction method. The results obtained by the modified feasible direction method are compared with those by the feasible direction method Modified method converges rapidly to the optimum value without zigzaging behavior, while feasible direction method has a tendency of zigzaging between constraint boundaries.
黃圭東 충주대학교 1993 한국교통대학교 논문집 Vol.27 No.-
In this study, vibration system with flexibly mounted dashpot is considered. Furthermore, dashpot mass is considered too. It is found that the system of vibration with flexibly mounted dashpot is stable. The forced vibration due to harmonic excitation is analyzed by applying the frequency resp-once method. The results that dashpot mass is considered are compared with those that dashpot mass is not considered.
황규동,이창훈,조영돈,김도석 충주대학교 2006 한국교통대학교 논문집 Vol.41 No.-
Pole Placement Control has been well establish in its theory. However, its practice value is yet to be appreciated in most industries. This paper presents an account in which the control strategy is run on the hydraulic motor. Using the input and output data from actual system, estimation of the model parameters are obtained by a function ARMAX(Autoregressive Moving Average with am exogenous signal) in Matlab and controller synthesis is achieved by a Pole placement control. Estimation system from a ARMAX is defined by third order and application of Pole placement control technique will be provide not only stability but also good performance for motion of hydraulic motor in any operation condition.