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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.
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.
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.
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.
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.
유한요소법과 경계요소법의 결합을 이용한 2차원접촉문제의 해석
정진형,우호길 충남대학교 공업교육연구소 1997 論文集 Vol.20 No.1
The coupled finite element method and boundary element method is applied to 2 dimensional elastic contact problem. Coupling the FEM and BEM is achieved by using the non-symmetric method which is a boundary element-like approach. In order to verify the method, the problems of simple cantilever beam and infinite plate with a circular hole are analysed. The results obtained the proposed method are compared with other numerical and analytic solutions, they are coincided well.
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.
함정 운동이 포함된 발사체 지지대 궤적 및 궤적 범위 함수산출을 통한 함정과의 간섭 예측
박윤호,우호길 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.5
In this paper, we have calculated a formular for sabot-trajectory of shipboard projectile including ship motion and generated trajectory-range function for analysing interference with structure of naval ship. We make formula to approximate the ship motion data of naval ship using optimization technique. Through this formula, we calculate the velocities and accelerations of sabot caused by ship motion(surge, sway, heave, roll, pitch, yaw) and then, we produce the formula about the trajectory of sabot including effects of ship motion in addition to previous study which had considered the effects of the pressure of flume, friction force, etc. To investigate interference with ship structures, we make the trajectory-range functions and then extract the nearest or farthest trajectory to ship structure. Through these data, we can conform whether the interference is happened or not.