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우호길 忠南大學校 産業技術硏究所 1988 산업기술연구논문집 Vol.3 No.1
A boundary element methed for solving problems of elastic bodies in contact is described. The method is successfully applied to some frictionless contact problems and the results are compared to other numerical and analytical solution to demonstrate the accuracy of the boundary element method.
단면이 변하는 외팔 보의 최적설계 : Strain Energy의 최소화를 중심으로
禹鎬吉 충남대학교 공업교육연구소 1985 論文集 Vol.8 No.1
The purpose of this study is to determine the shape of an elastic cantilever with a cross section varied stepwise by the minimization of the strain energy. The length of each beam segment as well as size of the cross section is taken into consideration as the design variable. The dynamic programming is used to obtain a recursive equation. A numerical example, a circula cross section beam is presented.
境界 要素法을 利用한 2次元 彈性體의 形狀 最適設計에 관한 硏究
전부일,우호길 忠南大學校 産業技術硏究所 1994 산업기술연구논문집 Vol.9 No.2
The development and application to the shape optimization of two-dimensional elastic body are presented. Boundary element method is used in this study to avoid the regridding process to account for shape charge. Feasible direction method is used as optimization technique and Finite difference method is used to get design sensitivity in the optimization process. To demonstrate the feasibility of the method proposed, shape optimization of two dimensional dlastic ring under point load is carried out as an example.
최병민,우호길 忠南大學校 産業技術硏究所 1992 산업기술연구논문집 Vol.7 No.2
Development and application in shape optimization of two dimensional holed elastic body using Finite Element Method are presented. Minimizing weight problem which includes stress and size constraints is treated here. SUMT and Conjugate Gradient Method are used as optimization techniques, and Trial Step Size Determination Method is used to get optimizing step size. Finite Element Method is used to compute stress constraint and Finite Difference Method is used to get design sensitivity in the optimization process. The optimal shape of a hole is obtained through the proposed analysis procedure.
송동수,우호길 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2
The development and application of the Leak-Before-Break concept to nuclear power plant piping are reviewed. A general procedure and criteria of LBB are also introduced. In order to study on the feasibility of LBB, a limit load method and a J-T method are evaluated for comparison. Both methodologies are applied to the stainless steel and carbon steel of reactor coolant system. The stability of postulated through wall crack on the nuclear piping are verified with elastic-plastic fracture mechanics using finite element method. It is concluded that the limit load and J-T method are acceptable for evaluation of the nuclear piping materials.
이규석,김재하,우호길 忠南大學校 産業技術硏究所 1991 산업기술연구논문집 Vol.6 No.1
The work presents an analysis of the contact problem between the two dimensional elastic bodies. Under the assumption of the unbonded and frictionless charateristics of the contact problem, the problem is formulated in the form of a quadratic programming using the finite element method. The solution is obtained by the modified simplex method with the dual problem approch. Several examples are solved to verify the presented method. First example is the contact problem between the elastic punch and the elastic flat. Second is the contact problem between the elastic cylinder and the elastic flat. The results are compared to other numerical and analytical solutions, and the results coincide with the solutions.
後方押出에 있어서 Dead metal Zone의 形狀에 關한 硏究 (Ⅰ)
禹鎬吉 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.2
A kinematically admissible velocity field for backward extrusion process is obtained by assuming the proper stream lines and introducing the flow function concept in the plastic deformation region. The shapes of dead metal zone are assumed to be linear and parabolic, and two upper bound solutions are compared with each other to study the effect of the shape of the dead metal zone. The comparison shows that the shape of the dead metal zone in beckward extrusion may be parabolic in the high reduction of area.
禹鎬吉 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(B)
The upper-bound approach was used to analyze combined forward-backward extrusion process. The deformation region was divided into four zones separated by planner and cylindrical surfaces of velocity discontinuities. The upper-bound solution was optimized by assuming the neutral plane. Results show that combined forward-backward extrusion process can be applied to industry in some cases.
유전자 알고리즘을 이용한 구조물 손상 탐색기법에 관한 연구
우호길(Woo, Ho-Kil),최병민(Choi, Byoung-Min) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.1
In this paper, a method for identifying the location and extent of a damage in a structure using residual forces was presented. Element stiffness matrix reduction parameters in a finite element model were used to describe the damaged structure mathematically. The element stiffness matrix reduction parameters were determined by minimizing a global error derived from dynamic residual vectors, which were obtained by introducing a simulated experimental data into the eigenvalue problem. Genetic algorithm was used to get the solution set of element stiffness reduction parameters. The proposed scheme was verified using Euler-Bernoulli beam. The results were presented in the form of tables and charts.
境界要素法(B.E.M)을 이용한 彈·塑性 회전체의 해석에 관한 硏究
禹鎬吉 충남대학교 공업교육연구소 1986 論文集 Vol.9 No.1
A boundary element method for solution of the problem of elastic and elasto-plastic torsion of solids in revolution is proposed. A constant element is used for the discretization of boundary integral equation. Numerical results for a uniform shaft with semicircular grooves are presented and compared with analytical solutions.